Todays' Service Call (Solve this service call)

[LarryFine]

I tried to mention this twice, but you are the only one that gets it that this is even possible, was easy to do with older QO panels and CH panels.

Not very different from re-configuring the breaker terminals in a meter/main stack.

 

[480sparky]

.........I tried to mention this twice, but you are the only one that gets it that this is even possible, was easy to do with older QO panels and CH panels.

Others know this. We just don't feel compelled to post it just because we do.

 

[peter d]

I think one of the transistors might be blown.

 

[ActionDave]

I think one of the transistors might be blown.

That is often overlooked or misdiagnosed.

 

[480sparky]

I think one of the transistors might be blown.

There were no sisters there. And if there were, none of them were trans.

 

[Little Bill]

Others know this. We just don't feel compelled to post it just because we do.

You didn't seem to know it as it was brought up to show you why you were reading 120V instead of 208V on the high leg at the breaker but normal 208V at the bus lug.

 

[chris1971]

So, what was the issue? Do we need 9 more pages before we’re told?

 

[kwired]

So, what was the issue? Do we need 9 more pages before we’re told?

He told us (not sure just how far back) that the main neutral lug was not tightly secured to the bus it was attached to.

 

[chris1971]

He told us (not sure just how far back) that the main neutral lug was not tightly secured to the bus it was attached to.

Thanks. Gave up after a few pages.

 

[romex jockey]

~RJ~

 

[growler]

This is a 200a 3-ph service to a small restaurant.

Once the arcing and overheating were solved, it was time to get outta Dodge.

I don't blame you for wanting to get away from this deal. Small restaurants almost never want to spend the money to get any major repairs done. Sounds like some major repairs would be needed to correct all the problems.

 

[Chamuit]

Not very different from re-configuring the breaker terminals in a meter/main stack.

I've seen this done with 3-phase GE panels. Kind of a nice feature if you have only a couple of 3-phase loads. First six spaces A-B-C, A-B-C, then A-C the rest of the way.

 

[LarryFine]

First six spaces A-B-C, A-B-C, then A-C the rest of the way.

Wouldn't that be first twelve spaces?

 

[rambojoe]

Used to be common to mark the high leg with red, and often was on the right position instead of center position. POCO's meter needed high leg to be on right position to work properly is part of reasoning.

How much 120 volt loading you can have entirely depends on how the transformer (bank) is built. Single core transformer is often three same sized coils and is "fixed". A bank made of individual single phase transformers, can be built to suit the needs of the loads. If majority of load is going to be three phase loads they may make them all the same size, if the majority of load is going to be 120/240 single phase then they may use a large unit for that side and smaller units for the others, or even just one smaller unit and build an open delta configuration.

I've seen 50 or 75 KVA lighting pots with only a 10 or 15 kVA stinger pot before where the expected load on third phase was limited.

always double check with the line boys to see where THEY want it and get a email for proof
... it seems different linemen land it where ever they want.. (think angry old prick of a foreman..)here in az we did it to the book and required to put it in the center... quite a few neighborhoods in phoenix had the high leg for farm stuff (mostly incubators and fans) -also a/c. when ever I look at the meter and see its 3 phase delta, I know why im getting a call to fix another dudes mess