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01-29-2021, 12:28 AM
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#41
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Senior Member
Brand: Thor Motor Coach
Model: Chateau 31L
State: Florida
Posts: 2,063
THOR #12189
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Quote:
Originally Posted by cavie
Nobody. That is the problem.
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so you're saying the sjo for the slides is ok because they're 12v, not 120?
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01-29-2021, 02:36 AM
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#42
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Senior Member
Brand: Keystone
Model: Sprinter
State: Florida
Posts: 1,422
THOR #15553
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Quote:
Originally Posted by The_Breeze
so you're saying the sjo for the slides is ok because they're 12v, not 120?
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No. It is used for both voltages. Just too big a subject for an RV sight with a group of non-electricians. I'm outa of here.
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2011 Keystone Sprinter 323BHS. Retired Master Electrician. All Motor Homes are RV's. All RV's are not Motor Homes.
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01-29-2021, 02:51 AM
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#43
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Senior Member
Brand: Thor Motor Coach
Model: Chateau 31L
State: Florida
Posts: 2,063
THOR #12189
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Quote:
Originally Posted by cavie
No. It is used for both voltages. Just too big a subject for an RV sight with a group of non-electricians. I'm outa of here.
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Probably just as well. You strike me as a hit and run commentator claiming the subject is too involved for us peons because you hold superior knowledge.
Thanks for sharing what you know and educating the rest of us.
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01-29-2021, 02:56 AM
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#44
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Senior Member
Brand: Thor Motor Coach
Model: Hurricane 31S
State: Texas
Posts: 4,157
THOR #6411
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Quote:
Originally Posted by The_Breeze
If this is true, why is my current 30A coach hardwired with 12-2 romex? 14-3 SJO has 300v and 30A capacity.
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First of all the amperage ability of any wire is rated in open or closed environment as well as being rated at 30, 60, 75 C,90 C degrees for constant amperage. That means that 12/2 solid wire is rated for 20 amps at 60 C will be rated at 30 amps at 90 C degrees, Then there is the fact that the same solid wire rated for DC will care less current than the wire rated for A/C current. To say that 9 strand 12 awg wire has the same capability in the open as 12 awg solid strand Romex in a tube is fundamentally wrong. Then there is the purity of the copper wire. Most common copper is at least 99.9% pure. You can also buy 2 awg welding cable with 624 strands of 30 awg rated a 105 C degrees that is 99.99% pure and has 10% less resistance (less heat) than standard 9 strand 2 awg cable which is 99.9% pure, So saying that all 12 awg wire is the same is wrong. 10/2 Romex is orange, 12/2 Romex id yellow and 14/2 Romex is white. Now you know why a master electrician is paid so well.
__________________
Jim & Roy Davis
2016 Hurricane 31S
1961 Rampside in tow
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01-29-2021, 03:00 AM
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#45
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Senior Member
Model: 25.2 Axis
State: Arizona
Posts: 839
THOR #3471
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Quote:
Originally Posted by Beau388
First of all the amperage ability of any wire is rated in open or closed environment as well as being rated at 30, 60, 75 C,90 C degrees for constant amperage. That means that 12/2 solid wire is rated for 20 amps at 60 C will be rated at 30 amps at 90 C degrees, Then there is the fact that the same solid wire rated for DC will care less current than the wire rated for A/C current. To say that 9 strand 12 awg wire has the same capability in the open as 12 awg solid strand Romex in a tube is fundamentally wrong. Then there is the purity of the copper wire. Most common copper is at least 99.9% pure. You can also buy 2 awg welding cable with 624 strands of 30 awg rated a 105 C degrees that is 99.99% pure and has 10% less resistance (less heat) than standard 9 strand 2 awg cable which is 99.9% pure, So saying that all 12 awg wire is the same is wrong. 10/2 Romex is orange, 12/2 Romex id yellow and 14/2 Romex is white. Now you know why a master electrician is paid so well.
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That’s telling em
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01-29-2021, 03:03 AM
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#46
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Senior Member
Brand: Thor Motor Coach
Model: Forest River Forester 235
State: Indiana
Posts: 4,883
THOR #6826
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Quote:
Originally Posted by The_Breeze
If this is true, why is my current 30A coach hardwired with 12-2 romex? 14-3 SJO has 300v and 30A capacity.
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It’s only 30A from the service entrance to your fuse panel. Thereafter it’s mostly 20A or 15 A so it can use the lighter gauge wire in the individual branch circuits.
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01-29-2021, 03:04 AM
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#47
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Senior Member
Brand: Thor Motor Coach
Model: Chateau 31L
State: Florida
Posts: 2,063
THOR #12189
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Quote:
Originally Posted by Beau388
First of all the amperage ability of any wire is rated in open or closed environment as well as being rated at 30, 60, 75 C,90 C degrees for constant amperage. That means that 12/2 solid wire is rated for 20 amps at 60 C will be rated at 30 amps at 90 C degrees, Then there is the fact that the same solid wire rated for DC will care less current than the wire rated for A/C current. To say that 9 strand 12 awg wire has the same capability in the open as 12 awg solid strand Romex in a tube is fundamentally wrong. Then there is the purity of the copper wire. Most common copper is at least 99.9% pure. You can also buy 2 awg welding cable with 624 strands of 30 awg rated a 105 C degrees that is 99.99% pure and has 10% less resistance (less heat) than standard 9 strand 2 awg cable which is 99.9% pure, So saying that all 12 awg wire is the same is wrong. 10/2 Romex is orange, 12/2 Romex id yellow and 14/2 Romex is white. Now you know why a master electrician is paid so well.
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Coach is 30A. I bought 14-3 SJOOW based on a previous recommendation. It's rated at 15A. 12-3 is rated at 20A. 10-3 is too fat to make the turn. Between a rock and hard place.
I'm returning the 14-3 tomorrow and getting the 12-3 (re: https://www.prioritywire.com/specs/SJOOW.pdf)
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01-29-2021, 03:31 AM
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#48
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Senior Member
Brand: Thor Motor Coach
Model: Chateau 31L
State: Florida
Posts: 2,063
THOR #12189
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Quote:
Originally Posted by Pete'sMH
It’s only 30A from the service entrance to your fuse panel. Thereafter it’s mostly 20A or 15 A so it can use the lighter gauge wire in the individual branch circuits.
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Thank you. Information I can use. I'll exchange it for 12-3 tomorrow. I plan to run the micro here and there so 12-3 gives me a greater comfort level.
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01-29-2021, 03:32 AM
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#49
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Senior Member
Brand: Thor Motor Coach
Model: Chateau 31L
State: Florida
Posts: 2,063
THOR #12189
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Quote:
Originally Posted by Beau388
First of all the amperage ability of any wire is rated in open or closed environment as well as being rated at 30, 60, 75 C,90 C degrees for constant amperage. That means that 12/2 solid wire is rated for 20 amps at 60 C will be rated at 30 amps at 90 C degrees, Then there is the fact that the same solid wire rated for DC will care less current than the wire rated for A/C current. To say that 9 strand 12 awg wire has the same capability in the open as 12 awg solid strand Romex in a tube is fundamentally wrong. Then there is the purity of the copper wire. Most common copper is at least 99.9% pure. You can also buy 2 awg welding cable with 624 strands of 30 awg rated a 105 C degrees that is 99.99% pure and has 10% less resistance (less heat) than standard 9 strand 2 awg cable which is 99.9% pure, So saying that all 12 awg wire is the same is wrong. 10/2 Romex is orange, 12/2 Romex id yellow and 14/2 Romex is white. Now you know why a master electrician is paid so well.
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Thank you for this.
__________________
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