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Highlights of the 18th Edition - Part 2

The Draft for Public Comment highlights some of the suggested potential changes to be in place for the 18th Edition of the Wiring Regulations from the 1st July 2018, coming into effect from January 2019.

Paul Collins, Technical and Training Manager at Hager, continues his series of analysis into the proposed changes with this second part of his series, focusing on 'Part 5'.
Please note: The Draft for Public Comment for the 18th Edition of the Wiring Regulations is a draft. The changes proposed in this document are subject to change and are not set in stone.

Part 5 Selection & Erection of equipment
For a number of years the regulations have stated that switchgear, protective devices, accessories and other equipment shall not be connected to a conductor intended to operate at a temperature exceeding 700C (unless the manufacturer can confirm that the equipment is suitable for such temperatures).

Note 4 has been added to 512.1.5 stating specifically where this is the case that tables 4D1A to 4D5 or tables 4H1 to 4H4 shall be used and tables 4E1 to 4E4A and tables 4J1 to 4J4 shall not be used when using 900C thermosetting cables.

521.11 Wiring systems in escape routes has been deleted and replaced with 521.10.202.

This new regulation is essentially the same. However, it now applies to all wiring systems whether or not they are in escape routes. Metal clips, saddles or ties will therefore be required when using non-metallic cable management systems.

Chapter 53 Protection, Isolation, switching, control & monitoring
This section has now been completely revised. Some of the requirements from this revised chapter are:-

  • Devices for protection against electric shock by automatic disconnection of supply shall also be suitable for isolation
  • Automatic reclosing devices providing protection against electric shock shall only be used where that associated part has access restricted to skilled or instructed persons only.
  • A warning notice shall be clearly displayed where this associated part is protected by such a device.
  • Different types of RCD’s are described (i.e. type AC, Type A etc.) and the appropriate RCD shall be selected
  • Where class I enclosures are used with TT systems and RCD’s are used to give protection against electric shock on outgoing circuits, double or reinforced insulation of all live conductors shall be used on the supply side of the RCD
  • 536 Co-ordination of protective devices has been expanded upon and now covers other items of electrical equipment and not just protective devices. This amended section covers the selection of electrical devices in terms of Short-circuit, Overload, Residual currents and Selectivity.<enum>This chapter now includes an informative annex which gives guidance on selection of devices to perform a particular function and also guidance on how to consider selectivity

Chapter 54 Earthing arrangements and protective conductors
This chapter has an additional requirement for an earth electrode to be added to an installation in addition to any earthing facility provided by the distributor.

There is also a recommendation that foundation earthing be used for new buildings

There are also new regulations added to provide for the switching of a protective conductor should this be necessary when two sources of energy supply an installation.

You can read the first part of Paul's analysis on the Draft for Public Comment here.
Author: Paul Collins
Posted: 2nd August 2017
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