|
0 members (),
35
guests, and
11
robots. |
Key:
Admin,
Global Mod,
Mod
|
|
|
Joined: Oct 2001
Posts: 20
Member
|
I would like to back up a second. Why do you have to run a #6 wire? It's a 50 amp circuit, why not run #8 THHN?
|
|
|
|
Joined: Oct 2001
Posts: 172
Member
|
Mick Take a look at 110.14(C)(1)(a) and then go to 310.16. The unit may not be listed and identified for 75C wire.
|
|
|
|
Joined: Aug 2001
Posts: 545
OP
Member
|
# 8 is good for 48 amps, and it is a fairly long run anyway.
The Golden Rule - "The man with the gold makes the rule"
|
|
|
|
Joined: Feb 2003
Posts: 198
Member
|
Most of the Hot Tubs I have wired required # 6 cu conductors,as per manufacturer instructions. How hot are the attics in your area? You will need to adjust your amps. Also you cannot sleeve NM outdoors, it is still a wet location,even above grade.
Shoot first, apologize later.....maybe
|
|
|
|
Joined: Apr 2002
Posts: 197
Member
|
334.80: NM must be used at the 60* ampacity which is 40A for #8 and 55A for #6. If you run thhn in conduit then the ampacity will be 50A and 65A respectively if the terminations are marked 75*. I'm assuming that no other derating will be necessary.
|
|
|
|
Joined: Jun 2003
Posts: 681
Member
|
If you are running it in the attic (typical here in NY for the summer is about 120 degrees F), that would take a multiplier of .75 times 65 amp (for 6 AWG) which is now rated for 48.75 amps.
Pierre
Pierre Belarge
|
|
|
|
Joined: Aug 2001
Posts: 545
OP
Member
|
The attics here in AZ do get hot, probably more than 120 deg. The spa calls for a 50 amp circuit. Derating the #6 might put it close. It would not make sense to do a splice just to run THHN through the pipe in that short run too the disc from the attic.
The Golden Rule - "The man with the gold makes the rule"
|
|
|
|
Joined: May 2004
Posts: 4
Junior Member
|
I agree splices could create possible unwanted problems in the future.Best to not splice the wire if possible.
(:
|
|
|
Posts: 32
Joined: June 2004
|
|
|
|
|