17th Edition Multi-Function Tester from Di-Log – Features

• Continuity test – with auto null facility to zero out lead resistance;
• RCD testing – trip time, trip current, ramp current;
• Prospective short circuit current – direct readout of PSCC;
• Insulation measurement – with 100, 250, and 500 V test voltages;
• Loop Impedance – unique loop test principal will not trip any RCD;
• RCD auto test – test RCD’s in auto mode without going back to the tester;
• Integrated socket polarity test;
• Fully protected – against damage when accidently connected across phases;
• Meets all the safety and performance requirements of the BS EN 61557;
• Manufactured in the UK.

Technical Specifications of the 17th Edition Multi-Function Tester

• Earth Continuity
  - Test Current: >200mA;
  - Display Range: 0.00ohms – 199ohms;
  -  Resolution: 0.01ohms maximum;
  -  Test Lead Compensation: Null lead resistance 0.00ohms – 10.00ohms;
  -  Live Circuit Detection: Test inhibit if >30V detected;
• Insulation Resistance
  -  Test Voltage: 100V, 250V, 500V;
  - Display Range: 0.5Mohms – 199Mohms;
  - Resolution: 0.01Mohms maximum;
  - Live Circuit Detection: Test inhibit if >30V detected;
• Loop Impedance
  - Supply Voltage: 195 – 253V, 45Hz – 65Hz;
  - Test Current: 15mA (non tripping for RCD protected circuits);
  - Display Range: 0.01ohms – 2000ohms;
  - Resolution: 0.01ohms maximum;
  - Loop Impedance: Phase to Earth;
  - Line Impedance: Phase to Neutral;
  - PFC/PSC Range: 0 – 26kA;
• RCD Trip Time
  - Supply Voltage: 195 – 253V, 45Hz – 65Hz;
  - Test Currents: 10, 30, 100, 300, 500mA;
  - Trip Time Ranges:
  # 0ms – 2000ms at 1/2 lAn;
  # 0ms – 300ms at lAn general;
  # 0ms – 500ms at lAn selective;
  # 0ms – 40ms at 5 x lAn;
  - Auto Test: Auto sequence for 1/2 lAn, lAn and 5 x lAn at 00 and 1800;
  - RCD Type: General (G), Selective (S), Pulsed (A), AC (AC);
  - RCD Trip: Current (Ramp Test);
  - Supply Voltage: 195 – 253V, 45Hz – 65Hz;
  - Test Currents: 10, 30, 100, 300, 500mA;
  - Ramp Current: Range 1/2 lAn, to 1.1 lAn;
• Voltage / Frequency Measurement
  - Display Range: 0 – 440V;
  - Resolution: 1V;
  - Frequency Measuring Range 45 – 65Hz;
  - Safety Rating: IEC 61010-1 300V CAT III;
  - Dimensions: 260 x 100 x 55 mm;
  - Weight: 950g;
  - Power Supply: 6 x AA Alkaline (supplied), 6 x AA NiMH;
  - Rechargeable (optional).

What is in the Box – The 9083P Multi-Tester is Supplied with

• Croc Clips: Red, Black, Green;
• A 2 year warranty;
• 6 x 1.5V cells LR6 type AA alkaline batteries;
• Test lead, 1.5M 13A UK plug to Red, Black, Green 4mm shrouded safety plugs;
• Test lead, set 1.5M 13A plug to Red, Black, Green 4mm shrouded safety plugs to Red;
• Black, Green 4mm shrouded safety test probes;
• Red, cordless, 4mm shrouded safety test probe;
• Buy online the 9083P 17th Edition multi-tester.

All the Di-Log instruments – including the 17th Edition Multi-Function Tester, 9083P – are designed and manufactured to the highest quality standards and you can be assured that all quality procedures strictly adhere to internationally recognized standards. All the products are designed to meet the relevant standards notably IEC1010 and CE requirements. Most of the Di-LOG testers and tools are also available on our website at the Testers section, where you can also purchase online the 9083P multi-function tester(17th edition).

1. Top Tap Off - 100A top tap off allows for the Invicta 3 Type B board extensions or MCB up to 100A with connection kit.

2. Shrouded Neutral Bar – Clear shrouded neutral bar to IP2X allows the contractor to install cables without removing the shroud. This ensures the safe and easy installation of the Invicta 3 Type B distribution boards.

3. Trunking Entry - The unique trunking entry obround system top and bottom enables the quick fitting of the Invicta 3 Type B distribution boards to trunking and without the extra cost in time and materials.

4. Clear Labeling – The L1, L2, L3 on moulding are visible with and without the front cover of the Hager Invicta 3 Distribution Board fitted, which show through the cover for ease of phase identification.

5. Single Pole Blank - New single pole blank design is easy to fit to both three phase boards and on a full DIN rail (single phase and DIN rail extension boxes).

6. Metering - The metering is integral with the main board of the Invicta 3 Type B – no need for an additional extension box – this is saving you both time and money.

Again, you can find this guide online via Hager – Invicta 3 Distribution Boards Hager – and, to purchase this range of Type B Distribution Boards(the Hager Invicta 3), visit our website – Industrial Consumer Units.

The Hager Invicta 3 Type B Distribution Boards – Benefits

• Multiple incomer choices for 125A and 250A boards.
• Optimal cabling space.
• Earth and neutral bars positioned for easier cabling.
• Screws on earth and neutral bars need less turns to fit cable.
• Unique trunking entry system – no need for paxolin.
• Metering fitted next to incomer / within board.
• Wide range of extension boxes for side, top and bottom.
• No spacers needed to mount boards, cableways or extension boxes.
• Removable door and front cover for ease of fitting.
• 125A tap off for board extensions or MCB.

4 reasons FOR the Invicta 3 Type B distribution boards

This new range of Invicta 3 Type B boards from Hager is packed full of features to help make your life easier. There are many reasons why they should be at the top of your list. Here are just four of these reasons:

Reason 1: Trunking Cable Entry

The Invicta Type B board has an end plate that is adapted for coupling to trunking. Simply remove the gland plate from the top or bottom of the board to leave a smooth return edge. This allows flush coupling to trunking and a smooth entry for cables to meet the requirements of the regulations. Paxolin and other time consuming solutions are a thing of the past.

Reason 2: Earth and Neutral Bars

The earth and neutral bars are positioned and designed for simpler installation. The neutral bars have transparent IP2X shrouding to make cabling easier. The screws on both need less turns to fix the cable.

Reason 3: Metering

The metering kit fits directly into the main board. This saves space and means that there is no need for an extension box.

Reason 4: Glazed Door

The Invicta Type B board is the best-looking distribution board on the market. Its glazed door allows ‘ordinary persons’ as defined by the 17th Edition to look into the board while denying them access through a lock.

Read more about the Hager Industrial Distribution Boards, the Invicta 3 Type B boards – meeting the 17th edition needs – and buy online the Invicta 3 range from Hager.

Introducing the new Hager Type B Distribution Boards – meeting the needs of the 17th Edition – part of the Industrial Distribution Boards; the Invicta 3 range: decisions, features, and benefits.

Decisions needed for the Distribution needs

• Regarding the 17th Edition
  Often more final circuits will need RCD protection. With multiple PCs, printers and other equipment likely to have a small earth leakage, nuisance tripping may be an issue. Consider having more outgoing ways and individual RCBO protection to avoid nuisance tripping.
• Regarding the Metering
  The Building Regulations Part L2 includes requirements for metering and sub metering in non-domestic buildings.
• Regarding the Control
  Demand for energy efficiency has led to an increased demand for control. Consider Type B boards that have integral DIN rails for control devices and that allow different size extension boxes to be fitted on the top, bottom or sides of the board.
• Regarding the Installation
  More outgoing ways, more RCBOs, more metering and more control devices means that ease of installation and cabling are important.

You must consider having more outgoing ways and individual RCBO protection in order to avoid nuisance tripping.

The Type B Distribution Boards – Features

The Hager’s Type B distribution boards are designed to help electrical installers meet the challenges of a modern installation. They are available in both 125A and 250A ratings. Read more below about some of the main features of the Hager Distribution Boards(Type B):

• The Ease of metering
  You can install a meter next to the incoming device in the 125A board. Dual metered boards are also available. Another option is to install a surge protection device.
• The Simple cable entry
  Trunking and cable entry facility means there is no need to use paxolin. Cable protection is built into the end-plate cable entry.
• The Neutral bars
  Transparent IP2X neutral cover allows for ease of cable installation. Screws fully turned down for easy and fast cabling.
• The Earth terminal cabling
  Earth terminal bars are mounted offset to neutral terminal bars and angled towards the installer for easy cable installation. The screws are fully turned down for simple and fast cabling.
• The Simple extensions
  18 and 36 module DIN rail extension boxes are available. No spacers required to mount boards, cableways or extension boxes. Boxes can be mounted at the top or to either side of the board.
• The Tap off board extension
  125A top tap off for simple board extensions or for an additional MCB up to 125A.
• The Clear labeling
  Ease of phase identification L1, L2, L3 mouldings show through when the front cover is fitted. Textured surface on busbar assembly allows contractor to write circuit identification.

The Hager Type B Distribution Boards – Benefits

Hager has developed the new Invicta Type B boards as a solution for modern commercial installations.  The whole nature of electrical sub and final distribution for commercial installations has changed in the last few years. Typically there are more outgoing ways, more RCBOs and/or RCD protection, more metering and more control devices.

Electrical distribution is at the heart of a building’s services. Modern distribution boards must enable designs that meet the demands of the 17th Edition, the need for more metering and the demands for energy efficient solutions through control devices or building management systems.

The people at Hager decided that it was time to design a board that meets the needs of current installations, not those of the past. This new range of Type B boards makes it easier for you to design and install electrical distribution systems that meet the needs of today and the future.

Note: These information are from the official specs presented by Hager – the Invicta 3 range. We are now in the process of updating our full offer of Hager Type B Distribution Boards – the Invicta 3 range – some of which are: Hager JK112BG, Hager JK116BG, Hager JK11003S, Hager JK11253S, Hager JK11004S, Hager JK104BG, Hager JK106BG, etc.

• Are you Installing the smoke alarms from Aico?
• Are you confused?
• Are there too many conflicting views?
• Here is the 17th Edition Myth Exploded! – the 17th edition myth related to the smoke and heat alarms (the pdf file)

• The Smoke alarms can be connected to a lighting circuit – this is the preferred  circuit.
• The alternative is wiring on a dedicated circuit.

Who says this?

• Most reputable smoke alarm manufacturers.
• The IEE, NICEIC, ECA or SELECT.

What does the 17th edition say?

The 17th edition does not make any reference to domestic smoke alarm installations in the whole document.

Why are some manufacturers saying that smoke alarms should be wired on a dedicated circuit?

They are misinterpreting the requirements of Chapter 56 – Safety Services. This makes reference to fire detection and alarm systems, but in section 560.10 it refers you to BS 5839 for the specific requirements. Appendix A makes it quite clear that BS 5839: Pt. 1 is the document being referred to. This standard is for commercial systems, it is not the standard for domestic smoke alarms systems, this is BS 5839: Pt. 6.

I’m confused: what should I do?

In the absence of specific advice in the 17th Edition for domestic smoke alarm systems to Grade D(mains with a back-up battery), follow the recommendations of BS 5839: Pt.6.

What are these recommendations exactly?

Clause 15.5 states that Grade D smoke alarms can be wired from either…

• ‘An independent circuit at the dwellings main distribution board, in which case no other electrical equipment should be connected to this circuit’.
• Or ‘A separately electrically protected, regularly used lighting circuit’.
• Note that RCD protection is not mentioned. Therefore, an RCD protected circuit is acceptable.
• Hard-wired systems must be on a single final circuit.
• Radio-Linked systems must be on a single final circuit.
• Radio-Linked systems can be on separate lighting circuits.

For any more advice, call and talk to the IEE, NICEIC, ECA or SELECT. Read/print the above details as a flyer from Aico – pdf file. To view the available domestic fire alarm systems, visit the Fire and Security section, Fire Alarms, Domestic Fire / Heat Alarms, where you can find an up-to-date selection of Aico smoke alarms, Aico Heat alarms, Aico CO alarms, etc. – buy online Aico fire alarms via SparksDirect.co.uk. A comprehensive Aico Smoke and Heat Alarms FAQ can also be found online here and here.

Hager Consumer Units – Features

1. Best in class cabling space top side and back;
2. Rear cutouts optimised for size and position;
3. Top wall removes for easy cable access and reseals to IP4X using two foam strips provided;
4. Quick fit meter tail kit accessory;
5. Quick fit meter tail kit accessory;
6. Integrated spirit level;
7. Top wall removes for easy cable access and reseals to IP4X using two foam strips provided;
8. Terminal bars are top mounted for easy cable dressing, fully rated to 100A;
9. Snap-able busbar;
10. Full metal DIN rail allowing ease of configuration and fitting of control devices;
11. Optional key lock;
12. Door available in both transparent and plain variants opening downwards for easy access.

Benefits of the consumer units from Hager

The Consumer Unit from Hager has been designed to fit into today’s home environment. Whether used to house electrical distribution or smart control devices, the unit’s colour and form have been designed to complement and integrate.

With preconfigured and configurable variants available, choice comes as standard. A full metal DIN rail allows devices to be fixed securely and a snap-able busbar allows contractors to choose the configuration. MCBs feature a new DIN clip allowing devices to be removed without the need to remove the busbar from other devices.

The Consumer Unit range from Hager – it really was inspired by you.

• Easy and fast unit to fit;
• Best cable space – largest amount & in all the right places;
• Easy to remove cable entries safely;
• IP4X seal to top surface;
• Optimised positions for cable entries & terminations;
• Fewer tools required to fit;
• Integrated spirit level allows for simple levelling;
• Easy unit to cable.

The Installation of the Consumer Units(Hager Guide)

1. Preparation of unit for fixing
   Remove cover. Select the cutouts required to bring the cables into the unit.
2. Remove cable entry cutout
   Remove the required cutouts if bringing cables through the bottom of the consumer unit.
3. Bring cables in on surface
   If cables are being brought in on the surface, the top wall can be removed to aid cable entry and can be sealed to IP4X rating using the sealing strips provided.
4. Fix unit to wall
   The units have a large range of fixing points allowing avoidance of obstructions in the wall.
5. Integrated level
   The unit has a built in spirit level which helps with fitting the unit neatly.
6. Snapable busbar
   The units can be wired to the configuration of your choice thanks to the snap-able busbar.
7. Wire the unit
   The unit is easy to wire thanks to the increased space between the devices and terminal bars.
8. Fix front cover
   The unit’s curved design fits in well with the home environment and the cover is secured by quarter turn fixings. The units allow for compliance with Part M of the latest building regulations.

The Consumer Units from Hager – Flush fit

The Hager range of flush fit consumer units are up to 25 percent faster to fit in both solid and partition walls.

• For partition walls, a flange and frame clamps the unit to the wall. There is no need for separate fixings, the unit simply slots into the prepared hole and the integral fixing screws are tightened.
• With solid brick walls, the installer refits the flange to the sides of the back box and uses it as a fixing bracket to secure the base unit to the wall. This allows the base unit to be held well away from the edge of the blocks or bricks and the plastering can be levelled to the edge of the base. The front cover can then be fixed from the front.
• There is a choice of 32mm or 25mm knockouts for the incoming cable. You can also fit the back box either way up, so the incomer cable can enter from the top or bottom from either the left or the right. Similarly for the outgoing cables, two removable plates at the top and bottom of the box allow the choice of slotted, overlap or 20mm knockouts from either the top or the bottom.
• When it comes to cabling, there is plenty of space between the devices and the terminal bars. The neutral and earth bars are aligned with the devices at the top of the board for easy access and there are no restrictions under the DIN rail to obstruct cable runs.
• A full metal DIN rail minimizes distortion and ensures that devices fit square in the unit and are not dislodged. A clip on the device makes them easy to remove and replace, without releasing others from the busbar.
• Finally you can mount a label on either the cover of the unit or on the devices. There is a recessed section on the board for an RCD label to meet wiring regulations.

To purchase Hager consumer units(including 17th Edition Consumer units), please visit the Consumer Units, Domestic Consumer Units, Hager Consumer Units or Industrial and Commercial Consumer Units – Hager. This guide is part of the official guide by Hager: CU Inside Out. Watch the Consumer Unit 17th Edition regulations movie from Hager for more details about the 17th edition consumer units.

• The consumer units – inspired by the consumer;
• Easy to install consumer units;
• Less effort and more speed;

More choice and less hassle – the consumer units from Hager

Hager is renowned for quality, reliability and choice; the New Consumer Unit range has been designed with the same attention to detail.

• MCBs with easy-fit and replaceable din clip;
• Metal din rail;
• Plain and glazed door options;
• Rounded corners – safer in transit;
• Installer snapable busbar;
• Configurable terminal bars.

The Hager Consumer Units – Quality, reliability and choice.

With pre-configured and configurable variants, choice comes as standard. With the full metal din rail, devices are fixed securely. On configurable variants, the snapable busbar allows the contractor the choice of configuration. The MCBs feature a new din clip allowing the installer to remove and replace a device without removing the busbar from other devices.

Incomer variants of Hager Consumer Units

• Switch disconnector; 63 & 100A;
• RCCB; 40A 30mA, 63A 30mA, 100A 30mA;
• Split load; 100A Switch disconnector, 63A/80A/100A RCCB;
• Split load time delayed; 100mA time delayed RCCB 63A 30mA RCCB;
• Split load twin RCCB; 100A switch disconnector + 2 x RCCB;
• Twin tariff; 2 x 100A switch disconnector;
• Multi tariff; 2 x 100A 1 x 63A switch disconnectors.

IP ratings of the Hager Consumer Units

• Metal: IP3X with door closed;
• Insulated: IP3X door closed and insulated top wall (IP4X top wall only);
• IP2XC with door open, and full complement of devices / blanks fitted.

The classification for the service condition, where all external cable entries are satisfactorily sealed to prevent insertion of a rigid steel rod of 2.5mm diameter in accordance with BS EN 60529.

Hager Consumer Units – accessories

The New Hager Consumer Unit has been designed to be the most versatile consumer unit available on the market today. The accessories below can be used to customise standard consumer units and enclosures to almost any configuration.

• 1 module blank piece;
• 8 module busbar;
• 12 module busbar;
• 22 module busbar;
• Neutral link;
• Locking kit;
• Incoming tail connection kit.

Hager Consumer units performance characteristics

• Limits of operation:
  - Ue = 240V, a.c.
  - Ui = 300V, a.c.
  - In = 63A (max) outgoing, rated frequency: 50Hz,
  - Icc = conditional prospective short circuit
  - 16kA at 240V, 50Hz, Pf 0.6.
  - Classification: Environment B
  - Maximum outgoing circuit = 63A 1P MCB/45A RCBO
  - Protection of persons: indirect contact via protective circuit (metal enclosure), direct contact enclosure
• Pollution degree 2 (with Hager outgoing devices installed)
• Suitable for indoors use only
• Suitable for the following earthing systems = TN-S, TT, TNC-S.
• For dimensional information and weights please consult the manufacturers catalogue
• All connections are classified as – Type F
• Please consult Hager for applications where this consumer unit will be flush mounted in a hollow / cavity wall

Read the first part of this article – introduction to the consumer units from Hager. Please note that this article was taken from the official specification offered by Hager here. To purchase Hager consumer units(and 17th Edition Consumer units), please visit the Consumer Units, Domestic Consumer Units, Hager Consumer Units or Industrial and Commercial Consumer Units – Hager. Watch the Consumer Unit 17th Edition regulations movie from Hager for more details about the 17th edition consumer units.

The Hager consumer units – inspired by you

From the inception of the design, Hager has worked closely with contractors and developers, to accommodate the homeowner with products that not only provide safety and peace of mind, but that are easy to use and good to look at.

• RCCB protection (will disconnect the protected circuits whenever it detects current leaking out of the circuit)
• Safe and secure
• Easy Access
• Embossed On – Off symbols

A Hager consumer unit – A unit that is easy to install

Through in-depth research with contractors, we have incorporated a number of innovative features that enable time saving and easy installation. Multiple fixing points, no restrictions under the din rail and cable entries positioned for easy access to devices, all add up to a spacious Consumer Unit that is quick and easy to install.

The Speed and safety of the Consumer Units from Hager

The design of the New Hager Consumer Unit allows it to be installed quickly and is designed to BS EN 60439-3 Annex ZA. The unit can be installed with only 3 hand tools and benefits from more internal cabling space – cable dressing has never been so simple!

The Hager Consumer Units – More speed less effort

Whether working on new build or refurbishment, speed is important. The New Consumer Unit from Hager is faster to fit thanks to time saving innovative features.

• Multiple option rear cut-outs – maximise alignment of cables to devices
• Removable and re-sealable top wall (re-sealable to IP4X with foam strips provided)
• Tail entries are 25mm2 DI and 16mm2 CPC
• Island style cut-outs – reduce risk of injury and speeds up removal
• RCCB protection – protects both home owner and installer

Read more about the Hager Consumer Units: the choices offered, the high quality features, the accessories, the incoming variants, the IP Ratings, and the performance characteristics. Please note that this article was taken from the official specification offered by Hager here. To purchase Hager consumer units(and 17th Edition Consumer units), please visit the Consumer Units, Domestic Consumer Units, Hager Consumer Units or Industrial and Commercial Consumer Units – Hager.

18W configurable consumer unit – options

• 18W consumer unit with Plain door – VC818CU;
• 18W flexible consumer unit with Glazed door – VC818CUG;
• Description – 18W Split Load Configurable 100A SW 2x 80A RCCBs;
• Buy online 18 way configurable consumer unit and read the technical specs(pdf file).

18 Way flexible consumer unit – Configuration examples

Purchase online 17th edition compliant consumer units from Hager, for domestic use, by visiting the Hager Consumer Units section on our website and choosing among the following consumer units available:

• 17th Edition Consumer Unit, Hager 14 Way Split Load Configurable 100A SW 2 x 63A RCCB Insulated Enclosure (VC714C1);
• 17th Edition Consumer Unit, Hager 14 Way Split Load Configurable 100A SW 2 x 63A RCCB Metal Enclosure (VH714C1);
• 17th Edition Consumer Unit, 14W (5+6+3) 100A MS 2X63A RCCB 3XMCB WAY (VC7563U);
• 17th Edition Consumer Unit 10W (3+4+3) 100A MS 2X63A RCCB 3XMCB WAY (VC7343U);
• 17th Edition Consumer Unit 12 way configurable 100A MS 2 X RCCB (VC712C1);
• 17th Edition Consumer Unit Hager 12 Ways 1 Switch 2 X 63A RCD 30mA Split Load Insulated Enclosure (VC766H1);
• 17th Edition Consumer Unit, Hager 10 Ways 1 Switch 2 X 63A RCD Split Load Insulated Enclosure (VC755H1);
• 17th Edition Consumer Unit, 16 ways configurable Twin RCCB (VC816C1).

BS 7671:2008 includes changes necessary to maintain technical alignment with CENELEC harmonization documents. A summary of the main changes is given below.

NOTE 1: This is not an exhaustive list.
NOTE 2: Particular attention is drawn to Section 701. This section now allows socket-outlets (other than SELV and shaver supply units to BS EN 61558-2-5) to be installed in locations containing a bath or shower 3m horizontally beyond the boundary of zone 1.

• Regulation 131.6 – adds requirements to protect against voltage disturbances and implement measures against electromagnetic influences. In doing so, the design shall take into consideration the anticipated electromagnetic emissions, generated by the installation or the installed equipment, which shall be suitable for the current-using equipment used with, or connected to, the installation.
• Regulation 132.13 – requires that documentation for the electrical installation, including that required by Chapter 51, Part 6 and Part 7, is provided for every electrical installation.
• Chapter 35 – Safety services, recognizes the need for safety services as they are frequently regulated by statutory authorities whose requirements have to be observed, e.g. emergency escape lighting, fire alarm systems, installations for fire pumps, fire rescue service lifts, smoke and heat extraction equipment.
• Chapter 36 – Continuity of service, requires that an assessment be made for each circuit of any need for continuity of service considered necessary during the intended life of the installation.
• Chapter 41 – Protection against electric shock, now refers to basic protection, which is protection under normal conditions (previously referred to as protection against direct contact), and fault protection, which is protection under fault conditions (previously referred to as protection against indirect contact).
  - Chapter 41 now includes those requirements previously given in Section 471 of BS 7671:2001.
  - Chapter 41 now requires that for the protective measure of automatic disconnection of supply for an a.c. system, additional protection by means of an RCD with a rated residual operating current (IΔn) not exceeding 30 mA and an operating time not exceeding 40 ms at a residual current of 5 IΔn be provided for socket-outlets with a rated current not exceeding 20 A that are for use by ordinary persons and are intended for general use, and for mobile equipment with a current rating not exceeding 32 A for use outdoors. This additional protection is now to be provided in the event of failure of the provision for basic protection and/or the provision for fault protection or carelessness by users of the installation.
  - Note that certain exceptions are permitted – refer to Regulation 411.3.3.
  - Chapter 41 includes Tables: Table 41.2, Table 41.3 and Table 41.4 for earth fault loop impedances (replacing Tables Table 41B1, Table 41B2 and Table 41D). These new tables are based on a nominal voltage of 230 V (not 240 V), hence the values are slightly reduced. It has been clarified that where an RCBO is referred to in these Tables, the overcurrent characteristic of the device is being considered.
  - Chapter 41 includes a new Table 41.5 giving maximum values of earth fault loop impedance for RCDs to BS EN 61008-1 and BS EN 61009-1.
  - FELV is recognised as a protective measure and the new requirements are detailed in Regulation 411.7.
  - Chapter 41 includes the UK reduced low voltage system. Requirements are given in Regulation 411.8.
• Chapter 42 - Protection against thermal effects, includes requirements in Section 422 Precautions where particular risks of fire exist (These requirements were previously stated in Section 482 of BS 7671:2001).
• Chapter 43 - Protection against overcurrent, includes those requirements previously given in Section 473 of BS 7671:2001. Information on the overcurrent protection of conductors in parallel is given in Appendix 10.
• Chapter 44 - Protection against voltage disturbances, includes a new Section 442, Protection of low voltage installations against temporary overvoltages due to earth faults in the high voltage system and due to faults in the low voltage system. This new section provides for the safety of the low voltage system under fault conditions including faults in the high voltage system, loss of the supply neutral in the low voltage system and short-circuit between a line conductor and neutral in the low voltage installation.
• Section 443 - Protection against overvoltages of atmospheric origin or due to switching, retains the existing text from BS 7671 and adds regulations enabling designers to use a risk assessment approach when designing installations which may be susceptible to overvoltages of atmospheric origin.
• Chapter 52 - Selection and erection of wiring systems, now includes busbar trunking systems and powertrack systems.
  - It is now required to protect cables concealed in a wall or partition (at a depth of less than 50 mm) by a 30 mA RCD where the installation is not intended to be under the supervision of a skilled or instructed person, if the normal methods of protection including use of cables with an earthed metallic covering, mechanical protection (including use of cables with an earthed metallic covering, or mechanical protection) cannot be employed. This applies to a cable in a partition where the construction includes metallic parts other than fixings irrespective of the depth of the cable.
  - Table 52.2 Cable surrounded by thermal insulation, gives slightly reduced derating factors, to take account of the availability of material with improved thermal insulation.
• Chapter 53 – Protection, isolation, switching, control and monitoring. Simplification means that requirements previously in Chapter 46, Sections 476 and 537 of BS 7671:2001 are now in this single chapter. Chapter 53 also includes a new Section 532 Devices for protection against the risk of fire, and a new Section 538 Monitoring devices.
• Chapter 54 - Earthing arrangements and protective conductors. The requirement that a metallic pipe of a water utility supply shall not be used as an earth electrode is retained in Regulation 542.2.4 which also states that other metallic water supply pipework shall not be used as an earth electrode unless precautions are taken against its removal and it has been considered for such a use. An example of other metallic water supply pipework could be a privately owned water supply network.
  - A note to Regulation 543.4.1 states that in Great Britain, regulation 8(4) of the Electricity Safety, Quality and Continuity Regulations 2002 prohibits the use of PEN conductors in consumers’ installations. Regulation 543.7 has earthing requirements for the installation of equipment having high protective conductor currents, previously in Section 607 of BS 7671:2001.
• Chapter 55 - Other equipment, includes new additional requirements in Regulation 551.7 to ensure the safe connection of low voltage generating sets including small-scale embedded generators (SSEGs).
• Section 559 - Luminaires and lighting installations, is a new series of Regulations giving requirements for fixed lighting installations, outdoor lighting installations, extra-low voltage lighting installations, lighting for display stands and highway power supplies and street furniture (previously in Section 611 of BS 7671:2001).
• Chapter 56 - Safety services, has been expanded in line with IEC standardization.
• Part 6 - Inspection and testing, was Part 7 of BS 7671:2001. Changes have been made to the requirements for insulation resistance; when testing SELV and PELV circuits at 250 V, the minimum insulation resistance is raised to 0.5 MΩ; for systems up to and including 500 V, including FELV, the minimum insulation resistance is raised to 1.0 MΩ.
• Part 7 - Special installations or locations, was Part 6 of BS 7671:2001. The structure of Part 7 includes the following changes.
  - Section 607 in BS 7671:2001 relating to high protective conductor currents has been incorporated into Chapter 54.
  - Section 608 in BS 7671:2001 relating to caravans, motor caravans and caravan parks has been incorporated into
  - Section 708: Electrical installations in caravan/camping parks and similar locations and Section 721: Electrical installations in caravans and motor caravans.
  - Section 611 in BS 7671:2001 relating to highway power supplies is now incorporated into Section 559.
  - The following major changes are incorporated in Part 7:
  ~~ Section 701 Locations containing a bath tub or shower basin.
  ~~ Zone 3 is no longer defined.
  ~~ Each circuit in the special location must have 30 mA RCD protection.
  ~~ Supplementary bonding is no longer required providing the installation has main bonding in accordance with Chapter 41.
  ~~ This section now allows socket-outlets (other than SELV and shaver supply units to BS EN 61558-2-5) to be installed in locations containing a bath or shower 3m horizontally beyond the boundary of zone 1.
• Section 702 - Swimming pools and other basins. This special location now includes basins of fountains. Zones A, B and C in BS 7671:2001 are replaced by zones 0, 1 and 2.
• Section 703 - Rooms and cabins containing sauna heaters. Zones A, B, C and D in BS 7671:2001 are replaced by zones 1, 2 and 3 (with changed dimensions).
• Section 704 - Construction and demolition site installations. The reduced disconnection times (0.2 s) and the 25 V equation no longer appear.
• Section 705 - Agricultural and horticultural premises. The reduced disconnection times (0.2 s) and the 25 V equation no longer appear. Additional requirements applicable to life support systems are included.
• Section 706 - Conducting locations with restricted movement, was Section 606 in BS 7671:2001.
• Section 708 - Electrical installations in caravan/camping parks and similar locations, now includes the requirement that each socket-outlet must be provided individually with overcurrent and RCD protection.
  The following new sections are now included in Part 7:
• Section 709 - Marinas and similar locations
• Section 711 - Exhibitions, shows and stands
• Section 712 - Solar photovoltaic (pv) power supply systems
• Section 717 - Mobile or transportable units
• Section 721 - Electrical installations in caravans and motor caravans – previously in Section 608 of BS 7671:2001
• Section 740 - Temporary electrical installations for structures, amusement devices and booths at fairgrounds, amusement parks and circuses
• Section 753 - Floor and ceiling heating systems.
  Appropriate changes have been made to Appendices 1 to 7, in particular the methods and tables used in Appendix 4. The following new appendices are now included:
• Appendix 8 – Current-carrying capacity and voltage drop for busbar trunking and powertrack systems
• Appendix 9 - Definitions – multiple source, d.c. and other systems
• Appendix 10 - Protection of conductors in parallel against overcurrent
• Appendix 11 - Effect of harmonic currents on balanced three-phase systems
• Appendix 12 - Voltage drop in consumers’ installations
• Appendix 13 - Methods for measuring the insulation resistance/impedance of floors and walls to Earth or to the protective conductor system
• Appendix 14 - Measurement of earth fault loop impedance: consideration of the increase of the resistance of conductors with increase of temperature
• Appendix 15 - Ring and radial final circuit arrangements, Regulation 433.1

You can download this guide as a PDF from the IET website. Read the 2 parts of the introduction to the 17th Edition of Wiring regulations – part 1 and part 2 (and more here). On our website, you can purchase 17th edition consumer units, 17th edition Multi-tester, and 17th edition junction boxes(17th edition compliant consumer units and junction boxes). Watch the Consumer Unit 17th Edition regulations movie from Hager for more details about the 17th edition consumer units.