Same xfrmr feeding 2 diff swiches

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mstrlucky74

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Scenario, same xfrmr feeding two different switches.

Building 22 switch being feed with 4 sets of #500 & 1 #1/0
Building #23 switch being feed with 5 sets of the same size wires.

To me it looks( the dot) like they are calling for either feeder to be tapped. I know you can’t run the sets for both switches from the xfrmr, meaning it can’t directly feed them so it has to be a tapped, correct? Could one one Ilsco tap blocks for this application? Seems a bit tricky. Need a big tap box as well. Thanks.
 

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mstrlucky74 said:
Scenario, same xfrmr feeding two different switches.

Building 22 switch being feed with 4 sets of #500 & 1 #1/0
Building #23 switch being feed with 5 sets of the same size wires.

To me it looks( the dot) like they are calling for either feeder to be tapped. I know you can’t run the sets for both switches from the xfrmr, meaning it can’t directly feed them so it has to be a tapped, correct? Could one one Ilsco tap blocks for this application? Seems a bit tricky. Need a big tap box as well. Thanks.
Click to expand...

I don't see why the connection cannot be made right at the transformer. Whether it is a legal tap or not is something else that IMO is not dependant on whether the connection is made at the transformer..
 
You can have multiple sets of conductors running from a transformer. Is the transformer located outside? If not, you will be limited by the 25' rule in 240.21(C)(6). If the transformer is outside the rule in 240.21(C)(4) will apply permitting unlimited conductor length as long as the installation complies with all of the rules in that subsection.
 
petersonra said:
I don't see why the connection cannot be made right at the transformer. Whether it is a legal tap or not is something else that IMO is not dependant on whether the connection is made at the transformer..
Click to expand...

9 sets leaving xfrmr?? Where the hell would all the conductors terminate? :dunce:
 
electrofelon said:
You could use something like this with one on each side of the spade for 16 terminals.
Click to expand...

But still don't understand how it's possible to come out of the xfrmr with 16 sets of 4". Does not seem like there would be enough room for all those conduits/flex to terminate on the enclosure.
 
electrofelon said:
You could use something like this with one on each side of the spade for 16 terminals.
Click to expand...

But still don't understand how it's possible to come out of the xfrmr with 16 sets of 4". Does not seem like there would be enough room for all those conduits/flex to terminate on the enclosure.

Sorry I have 9 sets 4".
 
mstrlucky74 said:
But still don't understand how it's possible to come out of the xfrmr with 16 sets of 4". Does not seem like there would be enough room for all those conduits/flex to terminate on the enclosure.

Sorry I have 9 sets 4".
Click to expand...
Typically on a a pad mount transformer they don't actually terminate ... they just stub up in an open bottom. Pad mount or not, you would have to look at the actual transformer drawings to see what room is available for conduits.
 
Is this transformer a POCO transformer?

If so, you should have their book of standards which has every type of xfmer they use with drawings and specs

Is this transformer one that was furn/installed by a contractor?

If so, manufacturer name, cat# and order number can all be looked up.....
 
cdslotz said:
Is this transformer a POCO transformer?

If so, you should have their book of standards which has every type of xfmer they use with drawings and specs

Is this transformer one that was furn/installed by a contractor?

If so, manufacturer name, cat# and order number can all be looked up.....
Click to expand...

Not a POCO. We, the EC, are F&I.
 
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