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Where to install a surge protection device - single phase domestic / light commercial supply

Arran Cameron

A surge protection device can be installed in two locations:

1. The consumer unit. This is the easiest to install but it takes up two spaces which may not always be available.

2. The isolator switch. This is more difficult to install as it involves having to remove the big fuse but it avoids taking up two spaces in the consumer unit.

Does anybody have any more comments or advice on the best location?

Proteus sells an attractive looking isolator switch with a 2 module SPD although it is a bit pricey compared with SPD modules for consumer units. Has anybody got experience of it?

Who actually owns an already installed isolator switch? Is it National Grid, the utility company, or the property owner?

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  • 0

    Note that Wylex now do a single-module SPD (which doesn't need protecting by an MCB as long as there's a 100A fuse upstream) which fits directly on the busbar (with terminals for N and E leads). Obviously only good for Wylex CUs though.

    As regards length, at more than 10m from the SPD the spike voltage can be twice what it is at the SPD (e.g. a 4kV spike reduced to 1.5kV at the SPD becomes 3kV further downstream) although I don't pretend to understand why.

  • 0 in reply to wallywombat

    I have noticed this Wylex single module SPD that slots onto the busbar.. Crabtree also sells one that looks like it's made on the same production line.

    Is it any good? Are there any disadvantages compared with a two module wide SPD?

    It appears that it will fit most consumer units. Not just Wylex.

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  • 0 in reply to wallywombat

    I have noticed this Wylex single module SPD that slots onto the busbar.. Crabtree also sells one that looks like it's made on the same production line.

    Is it any good? Are there any disadvantages compared with a two module wide SPD?

    It appears that it will fit most consumer units. Not just Wylex.

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