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can an indoor Transfer Switch be used on the other side of the wall as an outdoor service entrance and main panel?

Home Improvement Asked on December 18, 2021

Can an indoor Transfer Switch be used on the other side of the wall as an outdoor service entrance and main panel?

The concept is: The outdoor service entrance is wired through the wall to the SE rated indoor transfer switch. Then wired through the wall again from the transfer switch to the outdoor main panel.
Is this ok or will I need a UL listed panel to keep outside

One Answer

The simple answer is NO.

An indoor xfer switch enclosure is rated for a dry location only. You would need a Raintight enclosure if you were to use it where it is subject to weather conditions.

Answered by Retired Master Electrician on December 18, 2021

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