[GUEST]

one mcc panel contains feeders for 4 nos 5 hp motor,2 nos 10hp motor,3 nos 3hp motor,3 nos 1.5 hp motor.what will be the amps rating of incoming feeder?
one mcc panel contains feeders for 4 nos 5 hp motor,2 nos 10hp motor,3 nos 3hp motor,3 nos 1.5 hp motor.what will be the amps rating of incoming feeder?

Topic

[Hamid]

The connected load of an electrical installation is generally more than its actual maximum demand at any time. The reason is the liberal provisions made for loads that are to be used occasionally – spare feeders, maintenance power sockets and some reserve capacity available with most of the outgoing feeders. Moreover, some of the feeders may be operating under loaded. To design a switchgear assembly, particularly for its incoming feeder and the busbar ratings, based on the connected load would be neither economical nor prudent, and the protective scheme too would under-protect such a system. Based on experience, IEC 60439-1 has suggested a multiplying factor, known as the

[Hamid]

1- No 2-I agree you, the best diversity factor shall be obtained via field measurement and verifications. 3- It is related to actual cases

[Sinnadurai Sripadmanaban]

Could we apply this factor if in a factory each branch is connected to a motor which operates throughout the day?. Will it be more appropriate/accurate to record Amps for the duration of 8 hrs or so using a power analyser or data logger and select the maximum load?. A value of 0.5 may be too low in certain cases.

[fryad]

how i can calculate the divercity factor for socket panel and lighting panel and also for mcc panel

[Hamid]

Please refer to Table 1 in above reply No.1

[Author]

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