Ground the box


Old 07-16-16, 07:39 PM
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Ground the box

Hello everyone,

I need to make a 30 amp extension cord that is split in the middle into 3 separate 20amp extension cords. I will be using a metal gang box with a cover to do the connections where the extension cord is split. This will be used inside. There is a ground in the extension cord, but is it necessary to ground the metal box were the 30 amp extension cord is split into 3 20 amp extension cords. This will be 240 volt.

thank you,
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Old 07-16-16, 07:58 PM
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Not fully understanding what you are doing but any metal part.... especially a metal junction box.... must be connected to ground.
Old 07-16-16, 08:58 PM
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That is what I thought....

Thank you
Old 07-17-16, 04:55 AM
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If you are protecting the cords with a 30 amp breaker, you must use the same size wire for the extensions. You cannot step down and just call them 20 amp unless you have 20 amp protection for each branch of the cord.
Old 07-17-16, 05:31 AM
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Also, 20 amp (or single 15 amp) receptacles require 20 amp (or 15 amp) protection (respectively).
Old 07-17-16, 06:21 AM
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You can have 15 amp receptacles on a 20 amp circuit as long as there is more then one place to plug into on that circuit. If it is a dedicated circuit with only one place to plug into (simplex receptacle) that receptacle is required to be a 20 amp.

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