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Topic Title: SPD
Topic Summary: Type 3
Created On: 09 March 2019 06:42 am
Status: Read Only
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 09 March 2019 06:42 am
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Sorusorma

Posts: 8
Joined: 09 December 2018

Hi,

What are the sensitive equipment that needs type 3 SPDs?

thanks
 09 March 2019 10:46 am
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Zoomup

Posts: 6117
Joined: 20 February 2014

 09 March 2019 11:21 am
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AJJewsbury

Posts: 17795
Joined: 13 August 2003

What are the sensitive equipment that needs type 3 SPDs?

As a first approximation I'd suggest electronic devices that normally deal with very low voltage levels - e.g. computers and telecoms equipment.

But that's only an approximation - so it's worth checking all possible (e.g. electronic) equipment on a case-by-case basis. Some power electronics (e.g. inverters or dimmers) might also be sensitive and some IT equipment might have built-in protection (so wouldn't need extra SPDs in the installation). Similarly smaller (e.g. domestic) computers might be protected by type 3s in things like surge protected extension leads fed from general purpose sockets rather than having anything special in the fixed installation.

- Andy.
IET » Wiring and the regulations » SPD

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