Hot Tub Wiring Question - Electrician Talk - Professional Electrical Contractors Forum

bender1993 · 05-30-2009, 08:58 PM

I just want a little clarification here, I am wiring a 50amp hot tub with 6-3 from the panel to a junction box before it exits the house where I then did a changeover to #6 thhn (insulated ground of course) to a gfi shut off panel and then out of that with #6 thhn in liquidtight to the hot tub. I was just thinking, 310.16 says you can use as much as 55 amps on #8 thhn, would it be wrong of me to use the #8 instead of #6 thhn outside and is there anywhere in the code that says anything about this. Thanks

Magnettica · 05-30-2009, 09:10 PM

You need to use the 6/3 romex because romex ampacity is determined by using the the 60º column. The #8 THHN/ THWN is good for 50 amps, not 55 amps. Unless all the lugs are rated for 90º which I doubt they are, the only time to use the 90º column is for derating. Also, you may want to check the name plate rating at the connection point because "most" hot tubs require a minimum #6 copper. It was a good thought though.

John Valdes · 06-01-2009, 01:33 PM

Sometimes I wonder why we even have a 90 degree column. What terminals are rated at 90 degrees. I am asking. Thanks John

Dennis Alwon · 06-01-2009, 03:26 PM

Quote:

Originally Posted by John Valdes

Sometimes I wonder why we even have a 90 degree column. What terminals are rated at 90 degrees. I am asking. Thanks John

John the 90C column comes in handy for derating purposes. We may use the 90C for derating but we can never prtotect the 90C wire higher then the lowest temp. rating of any device, terminal etc. NM says 60C so we must use 60C but we can begin derating from the 90C.

Magnettica · 06-01-2009, 04:05 PM

Quote:

Originally Posted by John Valdes

Sometimes I wonder why we even have a 90 degree column. What terminals are rated at 90 degrees. I am asking. Thanks John

Same here. Everything from termination lugs, to circuits breakers, to the actual conductor, to the equipment ALL has to have the 90º rating to be able to use the 90º column. I agree, it is a bit confusing especially if you're just beginning to learn the NEC, Table 310.16 specifically.

steelersman · 06-01-2009, 04:16 PM

Quote:

Originally Posted by John Valdes

Sometimes I wonder why we even have a 90 degree column. What terminals are rated at 90 degrees. I am asking. Thanks John

When asking a question it is proper punctuation to use a question mark (?) at the end of your question.

Dennis Alwon · 06-01-2009, 04:25 PM

Quote:

Originally Posted by steelersman

When asking a question it is proper punctuation to use a question mark (?) at the end of your question.

Garth, we ain't in english, class dude.....

steelersman · 06-01-2009, 04:36 PM

Quote:

Originally Posted by Dennis Alwon

Garth, we ain't in english, class dude.....

Ain't isn't a proper contraction. The E in English should always be capitalized. There shouldn't be a comma after English either.

John Valdes · 06-06-2009, 12:26 PM

??????????????????????????????.......Heres a few question marks to cover my ass for a few posts.
Your grammar and punctuation will be combed over with a fine tooth comb from now on.
Oh, by the way. When your beloved Steelers come to Miami for the season finale, they are going down! I hope you guys need that game. I want to see your starters get a little pay back, and a long flight back to Pittsburgh for the holidays.

Thanks Dennis for the clarification on the 90 degree column.

Dennis Alwon · 06-06-2009, 01:08 PM

Quote:

Originally Posted by steelersman

Ain't isn't a proper contraction. The E in English should always be capitalized. There shouldn't be a comma after English either.

Garth, find the mistakes in the following statement.

Their are four erorrs in this sentance.

steelersman · 06-06-2009, 04:38 PM

Quote:

Originally Posted by Dennis Alwon

Garth, find the mistakes in the following statement.

Their are four erorrs in this sentance.

"Their" should be "There"

"erorrs" should be spelled "errors"

"sentance" should be spelled "sentence"

steelersman · 06-06-2009, 04:49 PM

Quote:

Originally Posted by John Valdes

Oh, by the way. When your beloved Steelers come to Miami for the season finale, they are going down! I hope you guys need that game. I want to see your starters get a little pay back, and a long flight back to Pittsburgh for the holidays.

Well John, after taking a gander at the schedule just a minute ago, it doesn't look like we will need that game. We finally have an easy schedule it looks like with our toughest game being against the Titans. Last year we had the toughest schedule that any team has had since the 70's and what did we do? You know what we did! Haha. Besides if we actually do need to win that last game it won't be any problem. What are you guys gonna do, run the wildcat offense every play like you did last year? Well guess what it may have worked decently against mediocre defenses but it won't stand the test of time for a full 60 minutes against the number 1 defense. Final score: 24-10 Pittsburgh Steelers.

drsparky · 06-06-2009, 04:49 PM

Quote:

Originally Posted by steelersman

"Their" should be "There"

"erorrs" should be spelled "errors"

"sentance" should be spelled "sentence"

"four" should be spelled "three"

steelersman · 06-06-2009, 04:51 PM

Quote:

Originally Posted by drsparky

"four" should be spelled "three"

No actually "four" is spelled correctly. Even though there were only 3 errors in the sentence, it is still a proper sentence.

steelersman · 06-06-2009, 04:52 PM

You don't spell "four" "three".

It was a feeble attempt to try to get me to think that there are 4 errors in the sentence when in fact there were only 3.

drsparky · 06-06-2009, 05:17 PM

Quote:

Originally Posted by steelersman

You don't spell "four" "three".

It was a feeble attempt to try to get me to think that there are 4 errors in the sentence when in fact there were only 3.

I know that but it is funnier my way.

Dennis Alwon · 06-06-2009, 05:41 PM

There are actually four errors in the sentence. You got three of them. The fourth is the sentence itself.

steelersman · 06-06-2009, 07:13 PM

Quote:

Originally Posted by Dennis Alwon

There are actually four errors in the sentence. You got three of them. The fourth is the sentence itself.

Well the sentence itself is not within itself so therefore there are only 3 errors in the sentence.

Peter D · 06-06-2009, 07:32 PM

Quote:

Originally Posted by steelersman

It was a feeble attempt to try to get me to think that there are 4 errors in the sentence when in fact there were only 3.

Any number under ten should be spelled out, so it should be "three" and "four" instead of "3" and "4."

steelersman · 06-06-2009, 07:38 PM

Quote:

Originally Posted by Peter D

Any number under ten should be spelled out, so it should be "three" and "four" instead of "3" and "4."

Then you should have said "10" instead of ten.