missed a 120 volt receptacle on a bid.
30' up in the air, feeding a wifi repeater.
7 amp load.
490' from the nearest panel.
#6 copper gives 2.81% voltage drop.
anyone got any magic math, or did i just
eat 1,000' of #6 thhn for one outlet?
missed a 120 volt receptacle on a bid.
30' up in the air, feeding a wifi repeater.
7 amp load.
490' from the nearest panel.
#6 copper gives 2.81% voltage drop.
anyone got any magic math, or did i just
eat 1,000' of #6 thhn for one outlet?
~New signature under construction.~
~~~~Please excuse the mess.~~~~
7 AMPS?
Take 2 500 foot rolls of #10 and see what the actual voltage drop is. Is it more than 5%?
Is it functional voltage? ie over 115 from 120?
Might need a change order for a transformer that wasn't on/in the plans?
Don't give up yet, make a play for their wallet.
Is voltage drop a part of the specs? If not, I would care about the actual voltage at the end, not the drop percentage.
I used #10 @ 8 amps and got a tad over 110V at 500' starting with 120V at the breaker. That would work IMO.
If the supply voltage was running high, using 490', and 7A load you could possibly fudge numbers to make #12 work, I am just conservative.
"Electricity is really just organized lightning." George Carlin
Derek
..if the NEC is mentioned in the specs, that pretty much covers voltage drop. Looks like you have to eat the cost of the mistake.
It's hard to believe that this was missed if it was shown correctly on the drawings/plans.
What's actually called for on the plans? I would think a dedicated circuit would be needed and not just shown as a receptacle.
If all they are showing on the plans is a receptacle I wouldn't worry about how far to the panel I would connect to the nearest receptacle circuit ( In theory) and ask for a change order to run a dedicated circuit (what's needed ).
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