480 Volt, 3 Phase, Receptacles

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sievert

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I am trying to find information in the code that provides direction on this subject to determine if the existing condition described below would be considered a violation of the code. I reviewed Article 210 and did not identify any section that really applied. Any help will be greatly appreciated.

We have three 480 volt, 3 phase receptacles, rated at 60 amps, that are on parallel circuits. All three receptacles are protected by a single 70 amp circuit breaker. The receptacles are not designated for a particular use, but rather temporary equipment such as welders, electric hoists, etc. NOTE: This configuration is in a power plant setting.
 
Re: 480 Volt, 3 Phase, Receptacles

210.21(B)(3) Receptacle Ratings. Where connected to a branch circuit supplying two or more receptacles or outlets, receptacle ratings shall conform to the values listed in Table 210.21(B)(3), or where larger than 50 amperes, the receptacle rating shall not be less than the branch-circuit rating.
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Re: 480 Volt, 3 Phase, Receptacles

All of the receptacles are designed for motor operated equipment. Not like the old toaster.

The number of receptacles do not increase the load, only the equipment plugged into them.

Some welders, both motor/generator and transformer/rectifier type have a high exciting current.

There should be no problem with this setup.
 
Re: 480 Volt, 3 Phase, Receptacles

Bennie the overcurrent is to high unless these outlets are for welders, there is no exception for motor loads.
 
Re: 480 Volt, 3 Phase, Receptacles

Bob: These receptacles are probably arc-tite welder outlets.

If a motor is hard wired, instead of plugged in, does it come under different methods for wiring?
 
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