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How to Wire a Storage Unit Circuit


storage unit circuit
Summary: Electrical Circuits Question: I have a woodworking shop set up in a storage unit and have tapped my electrical into one of two 20A GFI circuit breakers stemming from a sub panel on my building.




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Installing a Circuit for a Storage Unit



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Electrical Circuits Question:

I have a woodworking shop set up in a storage unit and have tapped my electrical into one of two 20A GFI circuit breakers stemming from a sub panel on my building. Upon investigation of the electrical set up,

I have looked into the sub panels of my building and the two previous(Out of 7 buildings between myself and the main breaker panel) and found that each building has a panel that has a breaker linking it to the next in line.

Two buildings before mine feeds 2-20A circuits, one GFI for the receptacles and one for the 70W HPS lighting circuit, and one 50 A breaker that feeds the building just before me.

The building just before me has the same 2 20A circuits as the previous and then has a 40A breaker that feeds the panel on my building. My building has instead of 2 20 circuits, 4 20A circuits, two of which are GFI protected. And all of this is being fed from a 40A breaker in the previous sub panel!

I don't have a complete electrical understanding, but his couldn't be right could it?
We are having trouble with having enough power on our circuits in the building sometimes depending if someone is using electricity further down in the facility. Is there any fix by increasing the size of the breakers down the line?
Name: Michael P.

Hi Michael - Great Electrical Repair Question!
No - increasing the size of the circuit breaker is not the answer. Increasing the capacity of the circuit by installing larger wire is, but this must be supported all the way back to the main panel that supplies the power for all. It sounds like the whole system needs to be configured based upon actual loads that are being connected throughout and the upgrading the supplying circuit. From my experience, storage units supply only enough power for lighting to each storage unit. If the breaker size is increased without increasing the size of the wire then there will be a high risk of fire due to overheating the existing wire.

Thank you for your response, that was what I had kind of figured but didn't want to hear due to the inconvenience. They have several 70w HPS ballasts that have been burned out and not replaced for a long time now, so I am sure they WILL NOT spend any money money on an upgrade.

Michael P.


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