Existing 400A 1PH 240V residential disco

[Ktmbowhunter1]

Good afternoon,

I recently was called to a residence to perform a walk-thru and complete an estimate for a customer. They have a home that is from the 60's with a 400A service. There is one disconnect with single barrel lugs on the load side feeding an existing 200A 1Ph 240V panel. They are adding radiant heat to their drive way which requires: 2 - 40A, 2P breakers and 2 - 60A, 2P breakers.

Obviously there is plenty of service amperage available(400A). The existing panel is about 15' laterally away from the disconnect.

The new panel to be installed would be on the other side of the residence approximately 60' laterally away. The total connected load for the radiant heat would be 120.8A @ 240V.

My question is: Can I legally add double barrel lugs in the existing disconnect and feed the new 200A panel?

 

[electrofelon]

Personally, I wouldn't, and dont, think twice about replacing lugs to meet my needs. Some people will call it a 110.3 (B) if the lugs are not approved or provided by the manufacturer. If in doubt about what your inspector will think, you may want to get his blessing first.

 

[Ktmbowhunter1]

I'm reading through the tap rule and am not seeing where I could make this happen without installing a new 400A panel with main breaker.

 

[electrofelon]

I'm reading through the tap rule and am not seeing where I could make this happen without installing a new 400A panel with main breaker.

Why is that? A 200 amp MB panel should do, assuming the details are complied with.

Edit: note you don't have to literally tap a feeder. The tap can start at the load terminals of the ocpd.

 

[augie47]

If I read the question correctly, your plan would be to add a second 200 amp feeder to the load side of the 400 amp disconnect to feed a panel 60 ft away. You are correct that such an install would violate the 240.21 tap rules.

 

[electrofelon]

If I read the question correctly, your plan would be to add a second 200 amp feeder to the load side of the 400 amp disconnect to feed a panel 60 ft away. You are correct that such an install would violate the 240.21 tap rules.

I missed the 60' part. Although it appears it may be outside in which case he could use the unlimited tap rule.....

 

[GoldDigger]

The distance for a feeder tap (with OCPD at the main disconnect) is not limited if it stays outside the building the whole way. Is that possible?

mobile

 

[Ktmbowhunter1]

I apologize. The Disconnect is located inside as is the existing panel. The unlimited exterior tap rule wouldnt apply in this scenerio. Just wanted to see if I was missing something before I discussed this with the inspector. Thanks for the feedback. Different eyes see different things.