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18th Edition Mythbuster

Guide to the New 18th Edition Wiring Regulations

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www.cudis.co.uk<br />

There are different types of surge protection devices (SPDs) for different<br />

applications.<br />

• Type 1:<br />

For structures equipped with an external lightning protection system or<br />

requiring protection against effects of direct lightning (i.e. fire and electric<br />

shock) such as structures supplied via overhead TT cables and metal<br />

structures. The devices should be installed at the origin of the electrical<br />

installation. Type 1 devices do not provide protection for sensitive<br />

electrical and electronic systems.<br />

• Type 2:<br />

For structures not requiring protection against effects of direct lightning<br />

but require protection against the effects of man-made transients including<br />

switching of inductive or capacitive loads (i.e. motors, transformers, LV<br />

generator supplies, etc). They should be installed at the origin of the<br />

electrical installation and Cudis recommend additional type 2 devices be<br />

installed in sub-distributions boards or close to the sensitive and critical<br />

equipment to be protected.<br />

• Type 3:<br />

For additional protection of particularly sensitive equipment Class 3<br />

devices should be installed in the fixed electrical installation close to<br />

the equipment to be protected.<br />

Cudis are an established supplier of Class 1, 2 and 3 surge protection<br />

devices for both 3 phase and single phase applications. New products<br />

and devices are being introduced and recent introductions include:<br />

• single phase retrofit boards for existing installations<br />

• 22 way split load consumer unit board with a surge<br />

device pre-installed in the unit<br />

• RCBO loaded boards with a surge device preinstalled<br />

in the unit<br />

• Combined Class 1+2 devices<br />

4

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