Wire type TGGT

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curd

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posted October 12, 2004 11:39 AM
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Is anyone familiar with wire type "TGGT"? I have been given a project to use this wire to wire heaters in an industrial oven. The insulation is rated at 250 deg c. The wire gauge is 12 awg. Is this some special type of wire? Do the NEC derating requirements regarding ambient temperature and number of wires apply to this wire? What does this 250 deg c mean for this type of wire? We run our oven zones as high as 890 deg f. This wire might be subject to an ambient of as high as 600 deg f. at some points. Any help is appreciated as this project is going on now.

Kind Regards,

Curd
 
Re: Wire type TGGT

I'm not familiar with that type of wire, but I can tell you that 250 C = 482 F. Sounds like the ambient temperatures you anticipate would melt the insulation off the wires, which is generally a bad thing.
 
Re: Wire type TGGT

This may not be an NEC issue, as you are wiring the internal parts of an oven. The NEC would cover the branch circuit wiring to the oven.
 
Re: Wire type TGGT

Ok, even though this installation is outside NEC regulations, applying the same logic regarding temperature limitations, should I not be concerned about it. Or should I be following other guidelines? And if so, what are they?
 
Re: Wire type TGGT

An eon or so ago I worked for an OEM company and we used teflon insulation for high temperature applications. But I think that's only good to about 600f (I wouldn't be satisfied with that here) and I've never seen it in an oven.

What I have seen in ovens and similar equipment is fiberglass weave.

Of course you should be concerned about it. Other guidelines? If you mean you have the latitude to use a different wire type that might make it easier but you'll want something that meets the specifications the application requires. :)
 
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