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Triplex has me perplexed

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rob-tejas

05-11-2001 21:40:31

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while totally rewiring a large two-story victorian home, i focused on nec code to the point of dreaming pseudo paragraphs out of it, a friend who was nice enough to call me during one of my few times of sleep, said i dozed off mid-conversation spouting 'bizarre electical specifications sounding crap'. anyway, this is prelude to a simple question, i ran 'triplex' from meter/pole to house, aluminum triplex-1/0. i haven't been able to find a definition of triplex, but know this is what it is called, the double black-insulated wires with cable messenger/neutral/ground?? or this is but an instance of the type? since i wanted something adequate for 90 ft, 200 amps, i'm pretty sure i blew the code. the question, finaly: is the ampacity for this type of overhead, outdoor, in free air, specified by table B-310-2? why is this type of wire not usually described in the normal way but seems to have code words? mine is NEM-TINA, i think, have seen 'converse, bergen, monmouth, ... etc. there is no labeling on cable. if the 1/0 i have is as in the above mentioned table, i needed to go a little heavier guage, oh well, if it melts this summer, i can run the thicker stuff.
just spouting off a bit.
thanks for any counter spouting,
rob

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smitty

05-16-2001 08:34:53

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Re: triplex has me perplexed in reply to rob-tejas, 05-11-2001 21:40:31

as a old lineman the 1/0 is just fine we used for up to 400 amp services

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BlueLite

05-15-2001 15:55:40

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Re: triplex has me perplexed in reply to rob-tejas, 05-11-2001 21:40:31

Just a bit of trivia.

In these parts anything after the gooseneck and up to and including the meter is electrician responsibility. He is required to install or maintain the meter
and also to give written proof to the utility that the entrance wiring is safe before tapping in. Everything after the meter is the utility responsibility. Your right about melting, if there is any, and
I read you correctly, this part of the wiring isn't fused. The transformer will just keep pumping and I mean without stop. Neat fireworks. I have a #8 3 wire cable running 100 ft
underground in 1 1/2in abs tubing. Thats fused
for 40 amps at the shop in a service panel. It supplies a 220 welder (I hardly ever use higher than 150 amps), 4 lights and all the power for woodworking. The breaker never tripped in 2 years.

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Dave K.

05-13-2001 21:10:18

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Re: triplex has me perplexed in reply to rob-tejas, 05-11-2001 21:40:31

The ampacities in the NEC only apply to the wiring in the house/building etc. These stop at the wires coming out of the weatherhead or to the u.g meter base. The utilities can run much smaller wires for the reasons mentioned by Franz and the fact that the NEC does not apply in this case.

The various names are just identifications applied by the manufacturers to the different sizes of wire.

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Franz

05-11-2001 22:17:52

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Re: triplex has me perplexed in reply to rob-tejas, 05-11-2001 21:40:31

Triplex has the same ampacity as overhead wiring of individual conductors. Near as I can understand your question, you have more than sufficient capacity for a 200 amp service. The norm for a 200 amp service would be number 2 triplex.

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rob-followup

05-12-2001 05:28:52

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Re: Re: triplex has me perplexed in reply to Franz, 05-11-2001 22:17:52

thanks for the answer. how do you come by that number? near as i can tell, i am supposed to use the above mentioned table, b-310-2, 'ampacities of 2 oe 3 single insulated conductors, rated 0-200 v, supported on a messenger . . . now, it doesn't say 'in free air', but the only table i see with the kind of numbers you are quoting is 310-19, for type z conductors with 150 deg c rating, but this would only be good in dry locations. i called and was told the triplex i bought was xhhw2.
still confused
rob

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Franz

05-12-2001 20:03:24

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Re: Re: Re: triplex has me perplexed in reply to rob-followup, 05-12-2001 05:28:52

Bout 30 years of hanging it from pole to pole. The ampacity of wire in open air compared to the same size wire in a conduit is dramaticly increased. It's all about the ability of the wire to discipate the heat caused by conductivity resistance. Back when triplex first came out, #6 was the utility standard. Over time, most utilitys went to #2 for added weight capacity in ice storms.

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Matt

05-12-2001 19:52:10

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Re: Re: Re: triplex has me perplexed in reply to rob-followup, 05-12-2001 05:28:52

Don't know if this will help, but the xhhw2 is broken down like this.

x - Insulation is a cross linked synthetic polymer. Very tough and heat and moisture resistant.
hh - Indicates much higher loaded current temperatures may be used, up to 194 degrees.
w - Indicates wet use type

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