tap of panel bus

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The SF on the part number translates to sub feed lug. These are used to provide a set of feed thru lugs on residential panels that dont have them. When used like that, a 150A subfeed lug cant be in a panel with a main larger than 150A. I have not read the documentation for these to know if they can be used as a feeder tap. Electrically, I dont see a reason why not as the downstream 150 would keep the lug within its rating. But this is not a proper feeder tap if it is not terminated in a breaker.
 
suemarkp said:
The SF on the part number translates to sub feed lug. These are used to provide a set of feed thru lugs on residential panels that dont have them. When used like that, a 150A subfeed lug cant be in a panel with a main larger than 150A. I have not read the documentation for these to know if they can be used as a feeder tap. Electrically, I dont see a reason why not as the downstream 150 would keep the lug within its rating. But this is not a proper feeder tap if it is not terminated in a breaker.
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Yes, so that's the question. Is this limited to panels where there an upstream OCPD is 150 amps or less? Or can it be used for a tap that terminates in an OCPD 150 amps or less.
 
Sierrasparky said:
I see it that way only if the terminal block was rated for 200 as the main is 200. I think most are in agreement here. I think what I am going to do in the short term is use a 125 amp breaker and wire to feed the sub panel. There is no provision for a main at the sub so tap rules will not work. Hopefully in the spring the customer will allow a service change to correct all the other issues. At least it will be compliant on this issue.
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If the terminal block was rated for 200 amps and the conductors connected to it were rated for 200 amps it wouldn't be a tap to begin with.

What is the violation of having a 150a rated terminal block used as a point for a tap?

The problem I see in this scenario is the lack of an OCPD in the subpanel being fed.

Jap>
 
I think the issue is, if there are conductors that are terminated in a 200A OCPD, but they run through a terminal block only rated to 150A, even though the 150A taps could be terminated properly, the terminal block could still have feed through amperage above its rating.

Did I understand that correctly, OP?
 
Seven-Delta-FortyOne said:
I think the issue is, if there are conductors that are terminated in a 200A OCPD, but they run through a terminal block only rated to 150A, even though the 150A taps could be terminated properly, the terminal block could still have feed through amperage above its rating.

Did I understand that correctly, OP?
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You did. The lack of a main OCPD in the panel, 150 amps or less is the issue since the rating of the tap block could be exceeded.
 
infinity said:
What good is the terminal block if it cannot be used for a tap in a 200 amp or greater panel? With a 150 amp rating it would need to be used for a tap or not used at all when the panel was over 150 amps.
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I suppose if it had a main breaker in the panel it was installed into then it would be fine. Without having the spec on this panel it may have a max load per buss stab as well. Personally I have never seen these used as a tap from a 200 a main. These are no longer made in a 150 amp rating.
 
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