Surge Protection Device Failure

[xguard]

We had a surge protection device fail within minutes of installation. I've contacted the manufacturer and am waiting to hear back from them. The system appears to be 480 VAC, 3 phase, with one leg grounded. Any ideas for possible causes for this type of failure?
Thank you.

 

[LarryFine]

It's the right voltage rating.

I'm going to guess that you connected the neutral wire to the grounded phase, which put 480v across components expecting to see only 277v.

I suggest asking ICM for the correct corner-grounded connections.

 

[don_resqcapt19]

My guess is that it is not rated for a corner grounded delta. I bet it sees the ungrounded to grounded voltage as a line to neutral voltage that exceeds the line to neutral rating of 350 volts.

 

[don_resqcapt19]

Did you connect the white wire to anything?

 

[LarryFine]

My guess is that it is not rated for a corner grounded delta. I bet it sees the ungrounded to grounded voltage as a line to neutral voltage that exceeds the line to neutral rating of 350 volts.

Isn't that what I said?

 

[xguard]

Did you connect the white wire to anything?

I luckily did not, but the electrician who wired it up did connect the neutral.

Are the MOV's in the device typically arranged in a wye configuration?

 

[don_resqcapt19]

I luckily did not, but the electrician who wired it up did connect the neutral.

Are the MOV's in the device typically arranged in a wye configuration?

The instructions show no connection to the white wire when installed on a delta system.

 

[qcroanoke]

The instructions show no connection to the white wire when installed on a delta system.

Very specific about it.