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Testing requirements between mains supply and a backup generator.

MS01
Firstly to set the scene, i have an electrical installation with has a mains LV switch panel that is supplied via a DNO supply and has a standby generator. The Generator feeds into a section of the panel which can be isolated via a bus coupler device to ensure only the key services are fed via the Generator. My question is these  circuits will be tested under the characteristics of the mains DNO supply but is there a requirement to do the same exercise with the generator in operation?

I appreciate the difference with the lower fault level contribution with a higher ze from the Generator but …why would you need to undertake the cable tests for the standby Generator scenario as well as the normal mains supply?.   


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  • 0
    So its clear there is no requirement that states you must undertake the installation cable tests for both mains and generator operation?   


    I would only expect to undertake the cable tests under mains operation and not to duplicate the results when under Generator operation.
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  • 0
    So its clear there is no requirement that states you must undertake the installation cable tests for both mains and generator operation?   


    I would only expect to undertake the cable tests under mains operation and not to duplicate the results when under Generator operation.
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