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Maximum demand on Electrical installation certificates

Dom

HI all, what are the thoughts on the maximum demand section of the Install cert. I ask this as I have seen many different approaches to this over the years with some people matching the fuse, other utilising the OSG process with diversity. My question centres around the fact in EV charge point installs the max demand is now very significant in respects to the DNO and the ENA process.

The max demand figure on the ENA and the cert must correlate? Does any one have an opinion on this or how it would affect the legitamcy of a certificate or an ENA in respects to governance - would it affect for example an insurance claim? If something was to go wrong?

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  • 0

    would it affect for example an insurance claim? If something was to go wrong?

    From an electrical safety point of view, it would be hard to imagine what insurance implication there might be. There should still be adequate overload protection whatever the MD had been assessed as - underestimating MD should at worst (other than a small reduction in the serviceable lifetime of the installation) just lead to undesired disconnection - there should be no significant increase in fire hazard for example. Buildings with overloaded conductors may well burn down, but normally that's a result of loose connections and the like - which would have been almost as likely without an overload.

    At a stretch I could perhaps see some indirect consequences - e.g. DNO fuse blows because demand significantly exceeds supply rating so freezer contents thaw, and there's an insurance claim for the spoiled food, but I suspect that sort of thing is way down the list of things to worry about.

       -  Andy.

Reply
  • 0

    would it affect for example an insurance claim? If something was to go wrong?

    From an electrical safety point of view, it would be hard to imagine what insurance implication there might be. There should still be adequate overload protection whatever the MD had been assessed as - underestimating MD should at worst (other than a small reduction in the serviceable lifetime of the installation) just lead to undesired disconnection - there should be no significant increase in fire hazard for example. Buildings with overloaded conductors may well burn down, but normally that's a result of loose connections and the like - which would have been almost as likely without an overload.

    At a stretch I could perhaps see some indirect consequences - e.g. DNO fuse blows because demand significantly exceeds supply rating so freezer contents thaw, and there's an insurance claim for the spoiled food, but I suspect that sort of thing is way down the list of things to worry about.

       -  Andy.

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  • 0 in reply to AJJewsbury

    HI Andy, thanks for the response - I accept the point re the overload issue, however my main concern and subsequent ask would be the non compliance between an ENA  and a certificate - if there were any discrepencies there. I am seeing more and more issues where insurers regardless of the cause flagging up non compliance as a way of geeting out of payment in a claim. 

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