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Meter Tails.

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You go to renew an old consumer unit. The Meter is in an outside wall box and the 16.0mm2 tails run in the cavity to a Henley block in the house nearby, where the consumer unit is located at high level. It is impossible to easily install new 25mm2 tails. There is no sign of overheating or damage at all. Do you just run your new 25mm2 tails from your new consumer unit to the Henley block or what? The main fuse must be a 100 Amp fuse as the house has storage heating, also supplied via 16.0mms tails which are in good condition.


Z.
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    16mm² should be fine on 100A fuse for fault protection (after all the 16mm² earthing conductor is) - so that just leaves overload. Is the combined rating of the outgoing ways of the CU and/or a reasonable assessment of actual maximum demand (e.g. a 6A lighting circuit supplying just one or two points isn't ever going to need the full 6A) sufficient to ensure that 16mm² can't be overloaded? For most homes it's likely to be fine, but if it's the type of place that's all-electric and has just had an EV charge point or two installed, it might not be so clear cut.


        - Andy.
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  • 0
    16mm² should be fine on 100A fuse for fault protection (after all the 16mm² earthing conductor is) - so that just leaves overload. Is the combined rating of the outgoing ways of the CU and/or a reasonable assessment of actual maximum demand (e.g. a 6A lighting circuit supplying just one or two points isn't ever going to need the full 6A) sufficient to ensure that 16mm² can't be overloaded? For most homes it's likely to be fine, but if it's the type of place that's all-electric and has just had an EV charge point or two installed, it might not be so clear cut.


        - Andy.
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