480V TVSS Protection?

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audiocableguy

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I would like to add TVSS protection to an existing service in a light commercial building. The unit is a Scientific Atlantic Zone Defender. There are two models available. One is a 480V 3 Phase Delta and the other is a 480V 3 Phase Wye.

The panel is 600 Amp, 480V. Inside the panel are 3 Legs, N, and G. Would this system be a Delta or a Wye? How would this be determined? The loads are lighting, AC units and several stepdown x-formers.

The existing panel next to it that has a TVSS wired directly to the main lugs and is set inside the disconnect. A small round gray canister with 1/2" ko and x4 10 AWG leads. Should these be fused?

I'd rather ask a dumb question then make a stupid mistake!
 
tom baker

tom baker

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Your profile indicates you are a consultant. Your questions concern me that you don't have a grasp of service voltages. 480V is very unforgiving..it has enough energy that a ground fault will keep burning until the OCD clears.
Should the leads be "fused"? Have you read the NEC article on TVSS and the mfgs instructions?
I'm going to lock this post. We don't allow posts from DIyers.
If you disagree send a PM to the chief moderator, Charlie B.
 
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