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Old 08-06-2011, 08:16 PM   #1
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Default RW or TW wire?

I went to my supplier to get a bunch of #10, and he was all out of RW, so I got TW instead. They look almost identical, they seem to handle almost identically.

Cheaper?

Anyhow, without going into where you cannot run TW in the code, what's the advantage of TW that you've noticed?

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Old 08-06-2011, 08:23 PM   #2
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Why did you want RW or TW.. since THHN/THWN has been the most used wire for such a long time..

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Old 08-06-2011, 09:56 PM   #3
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I would be surprised if you bought TW wire. I have not seen that in 20 years or more. But you are in Canada so perhaps it is so.
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Old 08-06-2011, 09:57 PM   #4
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I would be surprised if you bought TW wire. I have not seen that in 20 years or more. But you are in Canada so perhaps it is so.
I'm sure you mean new. We still pull a lot of it out of older buildings.
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Old 08-06-2011, 09:58 PM   #5
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I think you are leaving some letters out. There is RHW never heard of RW
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Old 08-06-2011, 09:58 PM   #6
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I'm sure you mean new. We still pull a lot of it out of older buildings.
Exactly, and I never heard of RW either.
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Old 08-06-2011, 10:11 PM   #7
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RW uses a plain rubber coating. I think it's similar to XHHW.
We had some spools of it left over from the war. When I found it the insulation was all dry rotted looking. I figured it was because it had been stored in a steam import room.
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Old 08-06-2011, 10:34 PM   #8
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RW uses a plain rubber coating. I think it's similar to XHHW.
RW is not listed in the NEC so I am guessing it is not around in the states anymore.
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Old 08-06-2011, 11:38 PM   #9
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Quote:
Originally Posted by Dennis Alwon

RW is not listed in the NEC so I am guessing it is not around in the states anymore.
Maybe 480 might be able to see if it's listed in one of his NEC's from the mid 40's.
When they built this hospital in 61 they brought everything over from the old one, including the old junk. They stored everything in our mechanical rooms just in case. You know the navy, never throw anything away. LoL. We had parts to 50 year old sewing machines from the days of sail makers.
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Old 08-07-2011, 12:12 AM   #10
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Don't feed the troll.
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Old 08-07-2011, 12:23 AM   #11
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Don't feed the troll.
I can't say he is a troll.. but I asked him a simple question (4) hours ago and he has avoided the answer..
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Old 08-07-2011, 03:29 AM   #12
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Quote:
Originally Posted by Dennis Alwon View Post
RW is not listed in the NEC so I am guessing it is not around in the states anymore.
We have probably the same wire as you but call it by a different name

For use in raceways, except cable trays, in wet locations:

Rubber (thermoset) insulated cable RW75, RWU75 = 75 deg C
RW90, RWU90 = 90 deg C
and
Thermoplastic-insulated cable TW, TWU = 60 deg C
TW75, TWN75,TWU75 = 75 deg C

the U means it can be direct burial

getting to the OP,there is no advantage to installing TW. The temperature rating doesn't allow termination to light fixtures, so that is why R90 etc is used.
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Old 08-07-2011, 08:54 AM   #13
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Quote:
Originally Posted by wcord

We have probably the same wire as you but call it by a different name

For use in raceways, except cable trays, in wet locations:

Rubber (thermoset) insulated cable RW75, RWU75 = 75 deg C
RW90, RWU90 = 90 deg C
and
Thermoplastic-insulated cable TW, TWU = 60 deg C
TW75, TWN75,TWU75 = 75 deg C

the U means it can be direct burial

getting to the OP,there is no advantage to installing TW. The temperature rating doesn't allow termination to light fixtures, so that is why R90 etc is used.
I didn't relies this was the Canadian section when I replied.
But does RW dry rot after being exposed to ambient heat for a very long time?

The rolls I mentioned finding had the RW written in china marker. There was no other writing on it , just rusty spools.
The old electrician I worked with was around during the war and he had told me what RW stood for.
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Old 08-07-2011, 09:57 AM   #14
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Quote:
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I didn't relies this was the Canadian section when I replied.
But does RW dry rot after being exposed to ambient heat for a very long time?

The rolls I mentioned finding had the RW written in china marker. There was no other writing on it , just rusty spools.
The old electrician I worked with was around during the war and he had told me what RW stood for.
There was wire many many years ago which appears to to like your old electrician was talking about. It was rubber coated wire with a cloth jacket. And over the years when it was subjected to heat, it began to crumble.

This is the description from Nexan's web site.

Single copper or compact ACM aluminum conductor with low temperature moisture resisting Exelene* cross-linked polyethylene insulation. LEAD FREE and RoHS compliant.

R90 is one of most common wires for conduit.

We also use T90 nylon which has the following specs;
Single copper conductor with thin wall PVC insulation and nylon covering with FT1 rating. Rated 600 volts. LEAD FREE.
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Old 08-07-2011, 01:35 PM   #15
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Wife rushing me.

The wire is THHN or THWN .... TWN75 or T90 nylon 600v.

That's a lot of ratings for 1 wire, which brings up another question. Why did they put so many ratings on 1 damn wire?

Wife rushing me!!!!
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Old 08-07-2011, 01:44 PM   #16
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The wire is THHN or THWN .... TWN75 or T90 nylon 600v.
That makes more sense
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Old 08-07-2011, 02:39 PM   #17
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Kaboler's a clown...
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Old 08-08-2011, 10:00 AM   #18
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by tw do you mean tew wire (same as mtw wire in usa). i use that a lot in control panels, the cable is a lot more flexible than rw
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Old 08-14-2011, 04:57 PM   #19
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Quote:
Originally Posted by kaboler
Wife rushing me.

The wire is THHN or THWN .... TWN75 or T90 nylon 600v.

That's a lot of ratings for 1 wire, which brings up another question. Why did they put so many ratings on 1 damn wire?

Wife rushing me!!!!
It is T90 nylon and its rated to use in place of the other ratings written on it. Check out table 19 in your code book.
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Old 08-14-2011, 09:40 PM   #20
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If it does'nt have a "w" in its designation then it can't be used in wet locations.RW90 for instance has to be used in underground conduits.T90 cannot.TWH I understand is no longer available in Canada so we have to use RW.


Last edited by crosport; 08-14-2011 at 09:44 PM.
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