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SELV Fusing

Martyn

Hi All,

I recently had a discussion with regard to fusing SELV lines, traditionally I always fused the +ve line feeding equipment.

A colleague recently mentioned that he had read an article from Sage? Arguing that both lines should be fused, from memory this ties up with 60204:2019.

A bit of thought suggests this would be wise as obviously with SELV there is no ref to earth for ADS. 

I cannot find the article, can anyone point me in the direction of some relevant info.   

Thanks

Martyn

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    I detect a "what if"  kind of question, whilst at the same time assuming two or more faults. I agree with Graham, should you have a multi-phase SELV system or PELV then more fusing may be required, but you specifically said SELV. I do not see that this is "wise" as you say, but then if you want you can fuse as much as you like on these systems. Of course you cannot fuse the neutral in any system depending on disconnection of Earth faults where the neutral is Earthed even if you fit RCDs, but I am sure you know all that. I wonder who wrote the article, I have no direct access to me?

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    I detect a "what if"  kind of question, whilst at the same time assuming two or more faults. I agree with Graham, should you have a multi-phase SELV system or PELV then more fusing may be required, but you specifically said SELV. I do not see that this is "wise" as you say, but then if you want you can fuse as much as you like on these systems. Of course you cannot fuse the neutral in any system depending on disconnection of Earth faults where the neutral is Earthed even if you fit RCDs, but I am sure you know all that. I wonder who wrote the article, I have no direct access to me?

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