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mpe803a

m32825

Active member
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Location
Central Florida
#6 has the current carrying capacity you need, you'll be fine. Voltage drop for 50' of #6 is only a volt more than #4 at max current. I went with #4 because it's my hobby and I wanted some overkill. Code tells you the minimum required to prevent fires, the only penalty for going bigger is to your wallet. I figured it's not that long a run and I'm only doing it once so why not?

-- Carl
 

mchlsprgn

Member
143
14
18
Location
jamul cal
#6 has the current carrying capacity you need, you'll be fine. Voltage drop for 50' of #6 is only a volt more than #4 at max current. I went with #4 because it's my hobby and I wanted some overkill. Code tells you the minimum required to prevent fires, the only penalty for going bigger is to your wallet. I figured it's not that long a run and I'm only doing it once so why not?

-- Carl
I figured it was close . I have a odd situation, in that the power goes from the main out to a sub panel and back from the gen on the same wire. I need to insure I can't back feed utility power to the gen That would be a disaster !!! any suggestions would be appreciated Mike PS this is becoming a hobby
 

Zed254

Well-known member
866
466
63
Location
S. Hampton Roads, VA
I have a odd situation, in that the power goes from the main out to a sub panel and back from the gen on the same wire. I need to insure I can't back feed utility power to the gen
Post 191. Study the picture. I cannot close my 70 amp breaker unless the main disconnect switch is open: this prevents back feeding Dominion Energy's system when I am on generator power. I cannot close the main disconnect switch unless the 70 amp breaker is open: this prevents Dominion Energy power from energizing my generator.

Picture shows my house on Dominion Energy: main disconnect is closed.
 

mchlsprgn

Member
143
14
18
Location
jamul cal
Post 191. Study the picture. I cannot close my 70 amp breaker unless the main disconnect switch is open: this prevents back feeding Dominion Energy's system when I am on generator power. I cannot close the main disconnect switch unless the 70 amp breaker is open: this prevents Dominion Energy power from energizing my generator.

Picture shows my house on Dominion Energy: main disconnect is closed.
Post 191. Study the picture. I cannot close my 70 amp breaker unless the main disconnect switch is open: this prevents back feeding Dominion Energy's system when I am on generator power. I cannot close the main disconnect switch unless the 70 amp breaker is open: this prevents Dominion Energy power from energizing my generator.

Picture shows my house on Dominion Energy: main disconnect is closed.
pic did did not come . I'd like to see Mike
 

Zed254

Well-known member
866
466
63
Location
S. Hampton Roads, VA
pic did did not come . I'd like to see Mike
Main disconnect is closed: I'm on power company's amps. If I switch the main disconnect to the right - open - I lose Dominion Energy's feed. The metal cover will now drop down and I will be able to close the contacts on my 70 amp breaker that feeds my panel when my generator is needed. In this configuration I cannot close the main disconnect switch and back feed my generator when the power comes back on. To do this I must first open the 70 amp breaker to allow the metal cover to be moved up and out of the way of my panel's main disconnect switch.
 

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Daybreak

2 Star Admiral
Steel Soldiers Supporter
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I figured it was close . I have a odd situation, in that the power goes from the main out to a sub panel and back from the gen on the same wire. I need to insure I can't back feed utility power to the gen That would be a disaster !!! any suggestions would be appreciated Mike PS this is becoming a hobby
Howdy,
You need to hire a electrician.
 
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