Triple Tap a Disconnect?

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Kidd

Member
Location
Texas
Occupation
Electrical Engineer
Hi all!

I came across this set up at a place that my brother is taking over and it does not look right to me, but thought maybe I'm missing something.

It has a service disconnect on the outside of the building that goes to a gutter. From the gutter it goes to the main disconnect shown. I haven't been able to open the disconnect, so I'm not sure if it's fused or anything. This single single disconnect then feeds (3) panels. Panel A , B and C.
Panel A is a main lugs only, 3 phase panel.
Panel B is a main lugs only, single phase panel
Panel C has a main breaker at 125, single phase panel.

Like I said, this does not look right to me, especially since panel A&B are MLO.

What do you guys think? Am I missing something?

Any input is greatly appreciated!

Thanks!

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Kidd

Member
Location
Texas
Occupation
Electrical Engineer
Sorry Jap,

The only wires I could read were the wires going to Panel B and Panel C. Panel B was being fed by #3's CU and I want to say wires going to Panel C were #1's CU. The panels and disco are laid out on a wall as shown in the sketch and they were all grouped together with a few inches between each of them.

Thanks!
 

augie47

Moderator
Staff member
Location
Tennessee
Occupation
State Electrical Inspector (Retired)
Without specifics such as those jap noted, it's difficult to tell how many violations, but likely there are violations of the tap rules and termination rules. Generally panels need to be protected based on their individual buss rating and taps must meet the 240.21 requirements.
 

tortuga

Code Historian
Location
Oregon
Occupation
Electrical Design
Also give us the approx age of the install or building.
If its pre 1959 there would have been very different rules for feeders and taps.
 

Kidd

Member
Location
Texas
Occupation
Electrical Engineer
Augie, yea I'm pretty sure there are violations. I thought especially since the conductors are of different sizes, and two of the panels do not have a main breaker. A contractor recently installed Panel C, but I'm going to tell him to re-install that by tapping the feeder in the gutter. The other two panels, though I'm sure are in violation, have been configured that way for as long as the owner can remember.

Tortuga, I believe the building was built in the late 80s.
 

kwired

Electron manager
Location
NE Nebraska
Overcurrent protection issues seems likely on panels A and B, but other than that need to know more about the loads served. Thread title seems to suggest you have concerns about three taps coming off the disconnect in question. You could have unlimited number of taps as long as you haven't overloaded the feeder you are tapping from. How they made those taps could be questionable also, but you haven't given any reason with information we do have so far to tell them to move that 125A tap to the supply side of that 200 amp disconnect either.
 
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