Any electricians in house. Ive got a question - Ford Powerstroke Diesel Forum
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post #1 of 12 Old 06-09-2013, 08:15 AM Thread Starter
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Any electricians in house. Ive got a question

Need to run a 50 amp 240v range outlet. Run is gonna be 75ft. Is 6ga wire enough?

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post #2 of 12 Old 06-09-2013, 08:22 AM
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I am no electrician, let's get the out of the way. I have ran 220 for both my range and HVAC units. range was 50' and the HVAC was over 75' from the breakers. I simply ran romex to the breaker and used a 220 breaker.

I have had no issue with each. oh, when you attach the wire run, Cal code i guess is every 4' not every 4", Opps. My wire run is holding the house together. LOL

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post #3 of 12 Old 06-09-2013, 06:06 PM
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I am licenced electrician... 6ga fine for 50amps even 60 amps up to 100'. Derating for distance doesn't come into play untill over 100'.

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post #4 of 12 Old 06-09-2013, 07:00 PM Thread Starter
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That's what I figured about the de rating. It's been to long though since I've done it


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post #5 of 12 Old 06-09-2013, 07:00 PM Thread Starter
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Thanks man


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ARP studs and OEM gaskets done by Renegade Diesel
ECM and Atlas 40 FICM tuned by Bill at PHP SCT tunes by Truck Source Diesel. Gearhead, Innovative, Wildman and Tyrant diesel
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post #6 of 12 Old 06-09-2013, 07:00 PM Thread Starter
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Now if I could find someone local with smaller than 500ft rolls


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ARP studs and OEM gaskets done by Renegade Diesel
ECM and Atlas 40 FICM tuned by Bill at PHP SCT tunes by Truck Source Diesel. Gearhead, Innovative, Wildman and Tyrant diesel
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Edge Insight CTS
Coolant filter
Bulletproof diesel FICM EGR Delete, Oil Cooler and Water Pump, and Light bar.
Dually LED lights from Stealth Automotive/Xpedition Outfitters
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post #7 of 12 Old 06-09-2013, 07:26 PM
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Lets work through it!

Using AWG 6 (assuming stranded THHN?) Code reference T 310.15(B)(16) tells us this wire is rated to 75 amps at 90*C, however since temperature ratings of termination lugs is unknown we must use "worst-case-scenario" column of 55 amps.

The formula to figure voltage drop is as follows...
VD= (2 x wire length x Amps x copper Ohms per 1000') / circular mils

2 x 75 x 50 x 12.9
26240


Punch in the numbers and you get roughly 3.7v drop. 240v-3.7=236.3v. Divide these numbers to come up with a percentage and we get... 1.6%

NEC requires us to maintain less than 3% voltage drop on branch circuit conductors. While guessing "is it good" will ballpark you, doing the math and knowing you are legal and within engineered limits is best. It covers your butt in case a building inspector hassles you or insurance ever blames "wiring".

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post #8 of 12 Old 06-10-2013, 06:23 PM
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u could also use #6 aluminum SER cable. (service entrance round) u can use #8 copper romex. any local supply house should be able to cut that for you. the #8 is much more expensive tho.

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post #9 of 12 Old 06-10-2013, 06:25 PM
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will work just fine...

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post #10 of 12 Old 06-10-2013, 07:13 PM
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Spend the money use the better product... get copper. I never used alum wire for my cc customers.

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'00 F350 extcab, 9' utility bed, dually 228k


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