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Old 07-10-2013, 11:56 PM   #1
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Default Backfeed SubPanel Generator

A friend of mine asked me if he set a portable generator back at his 3 car garage 150 ft from his house (to keep sound down) and hooked up a manual transfer switch to sub-panel then backfed to main panel (locking out main breaker of course) would the sub panel now be a main panel and main panel now be a sub panel and what would/could happen ?
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Old 07-11-2013, 12:00 AM   #2
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Quote:
Originally Posted by BytheBook View Post
A friend of mine asked me if he set a portable generator back at his 3 car garage 150 ft from his house (to keep sound down) and hooked up a manual transfer switch to sub-panel then backfed to main panel (locking out main breaker of course) would the sub panel now be a main panel and main panel now be a sub panel and what would/could happen ?
You are not creating a separately derived system as long as you do not switch your grounded neutral connection to the utility supply. This means 4-wire out to the garage. If I were you i'd plan to run #8 AWG out to the inlet device at the garage. The cord from the generator is your means for disconnect. Good luck.
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Old 07-11-2013, 12:03 AM   #3
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A friend of mine asked me if he set a portable generator back at his 3 car garage 150 ft from his house (to keep sound down) and hooked up a manual transfer switch to sub-panel then backfed to main panel (locking out main breaker of course) would the sub panel now be a main panel and main panel now be a sub panel and what would/could happen ?
No, you have to backfeed it into the main with an interlock so both breakers can't be on at the same time. Or put a main and interlock on the sub but you would only be able to power whats in the sub with generator power.
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Old 07-11-2013, 12:17 AM   #4
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i'm not sure I was totally clear. My friend is an electrician also and when power would go out he would be there and kill the main then backfeed his existing sub panel in garage which is wired correctly (4 wire) with isolated neutral. Him and myself are just wondering if there may be any ill effects during the outage sending return current backwards and reverse than the normal situation. Specifically, he was wondering if he needs to put the bonding strap from the isolated neutral to the ground bar in sub panel during the outage only then remove when he re-energizes service in normal direction ?
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Old 07-11-2013, 12:24 AM   #5
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Old 07-11-2013, 12:26 AM   #6
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Gfy cletis
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Old 07-11-2013, 12:28 AM   #7
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Your ground and neutral need to bounded. At generator usually.
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Old 07-11-2013, 01:22 AM   #8
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u can du dis!
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