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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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  • Former Community Member
    0 Former Community Member
    Most of the circuit tests are dead tests for a new installation - so they are relevant regardless of the source of supply


    For the rest, then you should be verifying (for example) phase sequence on both sources of supply, voltage and frequency on both sources of supply and so on and so forth


    Finally, you need to verify safety on both sources of supply - what testing you need to "duplicate" is likely to be those live tests only to verify safety.


    Regards


    OMS
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  • Former Community Member
    0 Former Community Member
    Most of the circuit tests are dead tests for a new installation - so they are relevant regardless of the source of supply


    For the rest, then you should be verifying (for example) phase sequence on both sources of supply, voltage and frequency on both sources of supply and so on and so forth


    Finally, you need to verify safety on both sources of supply - what testing you need to "duplicate" is likely to be those live tests only to verify safety.


    Regards


    OMS
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