Service Tap

[Alwayslearningelec]

Would this tap more than likely made to a bus bar or could it be conductors?

 

[infinity]

It would be conductors not bus. If there are no holes in the existing bus then a piece of bus is typically fabricated to allow for the connection of the conductors unless the bus can be drilled.

 

[jaggedben]

"Feeder tap in supply side of service disconnecting means"

 

[electrofelon]

It would be conductors not bus. If there are no holes in the existing bus then a piece of bus is typically fabricated to allow for the connection of the conductors unless the bus can be drilled.

Just out or curiosity, does con ed or the electrical contractor make these connections?

 

[Alwayslearningelec]

It would be conductors not bus. If there are no holes in the existing bus then a piece of bus is typically fabricated to allow for the connection of the conductors unless the bus can be drilled.

I'm confused are you saying it would be the new conductors to the the bus or new conductors to the con ed conductors?

 

[infinity]

Just out or curiosity, does con ed or the electrical contractor make these connections?

The contractor would most likely make this connection.

I'm confused are you saying it would be the new conductors to the the bus or new conductors to the con ed conductors?

The bus is existing in the service box. From the switch you're connecting the 5 sets of 600's which are conductors to the existing service bus.

 

[Alwayslearningelec]

The contractor would most likely make this connection.


The bus is existing in the service box. From the switch you're connecting the 5 sets of 600's which are conductors to the existing service bus.

So I'm tapping the bus?

 

[infinity]

So I'm tapping the bus?

Depends on what's in the service box. You may find that the existing bus has accommodations for adding the 5 sets. Here's a 4000 amp ConEd end box with plenty of spare holes for additional conductors.

 

[Alwayslearningelec]

Depends on what's in the service box. You may find that the existing bus has accommodations for adding the 5 sets. Here's a 4000 amp ConEd end box with plenty of spare holes for additional conductors.
View attachment 2580700

Ok you says depends so what would be another scenario aside from tapping a bus?

 

[infinity]

Ok you says depends so what would be another scenario aside from tapping a bus?

If there are no existing provisions for adding conductors (like in the photo) and the bus cannot be drilled then the bus would need to be modified with a new section added for the additional 5 sets of conductors. You would need a switchboard company to come in a measure the existing bus and fabricate the new bus section. After you run the conduit and pull in the conductors you could schedule a shutdown to add the bus section and tie in the 5 sets of conductors.

 

[electrofelon]

If there are no existing provisions for adding conductors (like in the photo) and the bus cannot be drilled then the bus would need to be modified with a new section added for the additional 5 sets of conductors. You would need a switchboard company to come in a measure the existing bus and fabricate the new bus section. After you run the conduit and pull in the conductors you could schedule a shutdown to add the bus section and tie in the 5 sets of conductors.

How frequent are problems with the listing worshipers in regards to this? Where modification is necessary, do these switchboard companies provide a UL field evaluation? Or do inspectors not really consider the ConEd tap box to be under the nec?

 

[infinity]

How frequent are problems with the listing worshipers in regards to this? Where modification is necessary, do these switchboard companies provide a UL field evaluation? Or do inspectors not really consider the ConEd tap box to be under the nec?

I'm assuming that a qualified switchboard company has the blessing of the AHJ to make modifications that are inline with the listing of the equipment. I've never seen anyone question it once it got past plan review nor had I ever seen a NRTL person look at the final product. These guys would come in and take their measurements, fabricate, and ship to the field. Sparkys would do the installation. It is possible that a behind the scenes evaluation took place but I doubt it.

 

[electrofelon]

I'm assuming that a qualified switchboard company has the blessing of the AHJ to make modifications that are inline with the listing of the equipment. I've never seen anyone question it once it got past plan review nor had I ever seen a NRTL person look at the final product. These guys would come in and take their measurements, fabricate, and ship to the field. Sparkys would do the installation. It is possible that a behind the scenes evaluation took place but I doubt it.

I am curious about this as an alternative to getting a UL field eval. Are people finding using a switchboard company (assuming it's acceptable to the AHJ) cheaper than getting a UL field evaluation? Say i need to make some modification to a switchboard. Technically, a "switchboard company" has no greater ability to modify/certify a piece of equipment then an electrician does. Of course it just comes down to what the ahj will accept