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06-04-2019, 07:42 AM
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#1
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Bus Nut
Join Date: Apr 2018
Location: New Orleans
Posts: 632
Year: 2001
Coachwork: Thomas
Engine: 3126b 210hp
Rated Cap: 48
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Wire size - Inverter To AC Panel
Ok. I have a blue seas ac panel. From that I have Ancor 12/3 stranded and tinned wire running to outlets and appliances. I am planning to use a 10/3 extension cord to go from my inverter to the panel. Is this ok? What is best? Thanks in advance!
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06-04-2019, 08:09 AM
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#2
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Bus Nut
Join Date: Jun 2018
Location: Claremont, NH
Posts: 480
Year: 2003
Coachwork: Bluebird
Chassis: International 3800
Engine: DT466E (195hp, 520tq)
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We used 8/3 but are only using the black, neutral and ground right now. The red is in reserve in case we upgrade our shore power and 110v box later on.
__________________
Dave
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06-04-2019, 09:17 AM
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#3
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Bus Geek
Join Date: May 2016
Location: Eastern WA
Posts: 6,401
Year: 2002
Coachwork: Bluebird
Chassis: All American RE (A3RE)
Engine: Cummins ISC (8.3)
Rated Cap: 72
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What is the capacity of the inverter?
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06-04-2019, 11:11 AM
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#4
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Bus Nut
Join Date: Apr 2018
Location: New Orleans
Posts: 632
Year: 2001
Coachwork: Thomas
Engine: 3126b 210hp
Rated Cap: 48
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My inverter is 3000w. This is way more than I need. I just know my better half will find a way to use electric cooktop and washer etc at the same time and call me when I’m fishing [emoji43].
I just figure if 12ga is normal then the main line will have to be bigger?
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06-04-2019, 11:43 AM
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#5
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Bus Geek
Join Date: Sep 2018
Posts: 2,831
Year: 2007
Coachwork: Thomas Built
Chassis: Minotour
Engine: Chevy Express 3500 6.6l
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Just to preface this; I have never wired a bus. I’ve chased wires in a commercially built RV and got a taste of the laughably poor workmanship that goes into them. I’ve also engineered and rewired an entire house, so take my advice as you will. In other words, I’m not a licensed electrician, but I do have some experience with AC current installations.
You will want to consult an NEC code book.
The wire you use is a function of the circuit’s intended maximum ampacity, the type of wire insulation, the size of the raceway, the number of conductors in the raceway, and the ambient temperature.
I’m doing this based on NEC table 310.15(B)(16)
That I found on the Internet, so you’ll want to confirm based on current code.
So assuming you are using non-metallic (AKA Romex)
And assuming 3000 W @ 120 V = 25 A + 20% (don’t exceed more than 80% of ampacity) = 30 A
And ambient temperature not exceeding 90 degrees C
And assuming number of conductors is 2 or 3
The wire size would be 10 gauge
http://marketing3.southwire.com/PubImg/2534e3165836463ea44839d9ef6cd5e0.pdf
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06-04-2019, 11:52 AM
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#6
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Bus Nut
Join Date: Jun 2018
Location: Claremont, NH
Posts: 480
Year: 2003
Coachwork: Bluebird
Chassis: International 3800
Engine: DT466E (195hp, 520tq)
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We are running a 3000w inverter as well with 4, 20 amp double breakers. We also think it's a little oversized for our initial needs. I had a friend (cert electrician) help me connect the inverter, batteries and breaker box and he told me to use the 8/3 wire.
__________________
Dave
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06-04-2019, 12:09 PM
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#7
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Bus Geek
Join Date: May 2016
Location: Eastern WA
Posts: 6,401
Year: 2002
Coachwork: Bluebird
Chassis: All American RE (A3RE)
Engine: Cummins ISC (8.3)
Rated Cap: 72
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Quote:
Originally Posted by Danjo
Just to preface this; I have never wired a bus. I’ve chased wires in a commercially built RV and got a taste of the laughably poor workmanship that goes into them. I’ve also engineered and rewired an entire house, so take my advice as you will. In other words, I’m not a licensed electrician, but I do have some experience with AC current installations.
You will want to consult an NEC code book.
The wire you use is a function of the circuit’s intended maximum ampacity, the type of wire insulation, the size of the raceway, the number of conductors in the raceway, and the ambient temperature.
I’m doing this based on NEC table 310.15(B)(16)
That I found on the Internet, so you’ll want to confirm based on current code.
So assuming you are using non-metallic (AKA Romex)
And assuming 3000 W @ 120 V = 25 A + 20% (don’t exceed more than 80% of ampacity) = 30 A
And ambient temperature not exceeding 90 degrees C
And assuming number of conductors is 2 or 3
The wire size would be 10 gauge
http://marketing3.southwire.com/PubI...d9ef6cd5e0.pdf
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Well said!
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06-04-2019, 12:35 PM
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#8
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Bus Crazy
Join Date: Apr 2019
Location: SW USA
Posts: 2,064
Year: 2003
Coachwork: IC / Amtran
Chassis: CE300
Engine: International T444e
Rated Cap: 23
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Ditto what Danjo said. Both the NEC and your inverter manufacturers documentation are good places to seek out the answer to your question. What other people did, with other equipment (right or wrong) is irrelevant. There's no 'normal'... it's entirely dependent on your max amp draw, fusing (to prevent that from being exceeded), environment, length of wire run, and wire type/insulation.
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06-04-2019, 06:08 PM
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#9
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Bus Nut
Join Date: Apr 2018
Location: New Orleans
Posts: 632
Year: 2001
Coachwork: Thomas
Engine: 3126b 210hp
Rated Cap: 48
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Thanks All !!
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