18th Edition Mythbuster

Guide to the New 18th Edition Wiring Regulations

Guide to the New 18th Edition Wiring Regulations


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www.cudis.co.uk<br />

Caravan Parks (708.415.1)<br />

Every socket outlet and also a final circuit intended for the fixed connection (from the<br />

connection/metering point to the consumer) of a supply to a mobile or residential park<br />

home shall be both individually protected by an RCD having a rated residual operating<br />

current not exceeding 30mA. Devices selected shall disconnect all live conductors.<br />

Arc Fault Detection Devices (421.1.7)<br />

The use of Arc Fault Detection Devices (AFDDs) conforming to BS EN62606 is a recommended method for<br />

providing additional protection against fire caused by arc faults in AC final circuits.<br />

This device is specifically to detect and disconnect dangerous electrical arcs in both the fixed wiring and the<br />

connected equipment which could be the source of a fire. If used, AFDDs should be installed in consumer units/<br />

distribution boards at the origin of the circuit to be protected.<br />

Following are examples of when additional AFDD protection may be want to be considered:<br />

- Premises with sleeping accommodation<br />

- Locations with a risk of fire due to the nature of processed or stored materials (i.e. BE2 locations such as barns,<br />

wood-working shops, stores of combustible materials)<br />

- Locations with combustible construction materials (i.e. CA2 locations such as wooden buildings)<br />

- Fire propagating structures (i.e. CB2 locations)<br />

- Locations with endangering of irreplaceable goods<br />

In the schedule of inspections, under the section dealing with consumer units and distribution boards there is a<br />

reference to check for the AFDD six monthly test notice, similar to what is already common practice for RCDs and<br />

RCBOs.<br />

Although the use of AFDDs is not mandatory, at this time, Cudis are currently developing compact AFDD devices<br />

which should become available during 2019.<br />

Overvoltage Control (443.4)<br />

Protection against transient overvoltages is now required in a number of specified situations where overvoltage<br />

could result in:<br />

- Serious injury or loss of life<br />

- Interrupted public services<br />

- Damage to cultural heritage<br />

- Interrupted industrial and commercial activity<br />

- Affect a large number of co-located individuals<br />

or<br />

- In any building which has lightning protection system installed or is supplied via overhead lines.<br />

For other circumstances a risk assessment must be carried out to determine if protection against transient<br />

overvoltage is required. Designers should note that if they do not do a risk assessment, protection against<br />

transient overvoltage must be provided. The only exception is for individual dwellings if the total value of the<br />

electrical installation and electrical equipment therein fails does not justify such protection.<br />


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