DIY Doctor

Cooker Load

Postby romtom » Thu Mar 13, 2008 2:44 pm

New kitchen being fitted and the plan is to replace an existing double ovens with two single ones. Existing oven is fed from CU with standard 6mm T&E, can both ovens utilise the same cable of does another feed from CU need to be wired. Not sure what the total connected load of the old oven is but the new ones together is about 7.2kW. Thanks
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Postby ericmark » Thu Mar 13, 2008 9:10 pm

At 31.3 amps 6mm² would normally be ample but this also depends on routes etc. As to isolators it would need some common sense in theory every device would have its own isolator but if you had the ovens in such a way they are basically one then it may be more appropriate to use one with consideration of labeling. But these decisions will made by the responsible person i.e. the one who has the qualification's to sign the installation certificate. You are not replacing like for like so it will be controlled by Part P. 514.1.1 Except where there is no possibility of confusion. a label or other suitable means of identification shall be provided to indicate the purpose of each item of switchgear and controlgear. Where the operator cannot observe the operation of switchgear and control-gear and where this might lead to danger, a suitable indicator shall be fixed in a position visible to the operator. You may need indelible notices making to comply. 132.3 and 132.10
Disconnecting devices shall be provided so as to permit switching and/or isolation of the electrical installation, circuits or individual items of equipment as required for operation, inspection, fault detection, testing, maintenance and repair. Cable routes and methods will need selecting from the tables and rating factors calculated but I would not think this would be a problem. Remember electricians can't sign installation certificates if they did not control the installation so better to get one before you start the job.

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