Maximum current for a unit supplied from a 13A socket, taking supply voltages into account.

Anthony Hoare over 8 years ago

I am currently developing a heated food merchandising unit to be supplied from a 13A three pin plug.

If the unit is designed around 230V, 13A, do I have an issue when the supply voltage is at the top of its tolerance (230V + 10% = 257V).

As I have a purely resistive load, the current drawn would be 14.3A

Is this an accepted method or should the unit be designed around 257V 13A?

Your help would be appreciated.

Tony Hoare

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0 Legh Richardson over 8 years ago

Simon Barker:

I wouldn't expect the 13A fuse to blow ever on a modest overload. The standard charts for a BS1362 13A fuse show it lasting at least 10 000 seconds at 20A. The plug will have melted long before the fuse blows. See http://www.pat-testing-training.net/articles/fuse-operation-characteristics.php

Excellent information, thanks for that. It doesn't show up in COP PAT or BS7671.......
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0 Legh Richardson over 8 years ago

Simon Barker:

I wouldn't expect the 13A fuse to blow ever on a modest overload. The standard charts for a BS1362 13A fuse show it lasting at least 10 000 seconds at 20A. The plug will have melted long before the fuse blows. See http://www.pat-testing-training.net/articles/fuse-operation-characteristics.php

Excellent information, thanks for that. It doesn't show up in COP PAT or BS7671.......
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Maximum current for a unit supplied from a 13A socket, taking supply voltages into account.

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