Feeder Taps

[George Stolz]

From a PM, left unquoted for quotability:

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We normally utilize feeder taps in some of our larger residential services, 400-amp and up.
I have a situation where I do not have room in the home for a 600-amp main disconnect and/or distribution so I need to set this main disc sw in the large generator pit outside. This switch will now be a service rated automatic transfer switch.
What I am looking to do is install parallel 350mcm cu conductors from that main disconnect switch into the house, enter a 12 x 12 auxiliary gutter then install feeder taps to feed 200-amp main breaker panels, as needed, along with 150-amp disconnect switches that will protect a pool house panel and a couple of lighting sub-panels in another section of the home.
The feeder taps to the 200-amp panels will be 3/0 cu, 1/0 cu to the 150-amp disconnects.
I will be using 4-port Polaris type connections at my tap locations. This will provide a true 600-amp throughout the system because we have installed these feeders in parallel. My basic service calc is under 100k. There will be no voltage drop issues.
There will be approx 30-40 feet of feeder conductors from the main disc sw in the outside pit through the gutter in the house where I will be setting my main breaker panels.

Here is my question;
I am calling the conductors from the main disconnect in the pit into and through the auxiliary gutter, feeders.
I am calling the conductors from the feeders to the individual panels and disconnects, feeder taps.
There is no length restriction that I can see governing the length of my feeder conductors from the main disc sw through my auxiliary gutter in the home.
My 30-40 feet length of protected feeder conductors is ok.

Is this correct?

Thank you!

 

[Smart $]

..

Is this correct?

...

Yes. Feeders not limited in length. Taps are, but assume the panels and disconnects are immediately adjacent to gutter so sthat shouldn't be an issue.

What I question is the 4-port connectors. Unless two of the ports are of feedthrough design, you need connectors with at least 5 ports, for each tap: two in, two out, one for tap.

 

[jimC.]

It sounds like the panels might be located in other parts of the house and not on the other side of the wall in the garage. If that is the case, the AHJ my well want ocp immediately after the tap.

 

[Smart $]

It sounds like the panels might be located in other parts of the house and not on the other side of the wall in the garage. If that is the case, the AHJ my well want ocp immediately after the tap.

Well I think the tap rules of 240.21(B) would apply to OCPD regardless of where the AHJ wanted them. :happyyes:

As to panel location, that's why I said...

Yes. Feeders not limited in length. Taps are, but assume the panels and disconnects are immediately adjacent to gutter ...