Making own holes for lugs switch gear

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SAP

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Fresno Ca
we did a major mistake, we went according to plans, paco did not give us permission to operate for a solar project, We do not have a visible disconnect Southern California Edison wants to see that the disconnect is in the open position,rackable breaker or knife blade disconnect, 480/277 volt 1600 amp new service only for solar, there is for cabinets #1 is the pull cabinet for paco then 2 is meter and main breaker 3 and 4 are distribution, the idea is to put a disconnect on the side of the last distribution cabinet, we're gonna disconect the bussing except for neutral from cabinet 2 which is main breaker from cabinet 3 We plan on hooking up cabinet 2 to line side of disconect via wire 5 sets of 400 mcm with 4/0 equipment ground no neutral, then hooking up cabinet 3 the same way on the load side of disconect, my question is when we installed switch gear I don't remember seeing accommodations on bussing for taps, I know if I drill my own holes it would not be UL listed anymore but I have no choice, does anybody see anything wrong with that install,
 
SAP said:
we did a major mistake, we went according to plans, paco did not give us permission to operate for a solar project, We do not have a visible disconnect Southern California Edison wants to see that the disconnect is in the open position,rackable breaker or knife blade disconnect, 480/277 volt 1600 amp new service only for solar, there is for cabinets #1 is the pull cabinet for paco then 2 is meter and main breaker 3 and 4 are distribution, the idea is to put a disconnect on the side of the last distribution cabinet, we're gonna disconect the bussing except for neutral from cabinet 2 which is main breaker from cabinet 3 We plan on hooking up cabinet 2 to line side of disconect via wire 5 sets of 400 mcm with 4/0 equipment ground no neutral, then hooking up cabinet 3 the same way on the load side of disconect, my question is when we installed switch gear I don't remember seeing accommodations on bussing for taps, I know if I drill my own holes it would not be UL listed anymore but I have no choice, does anybody see anything wrong with that install,
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I have seen clamp-on lugs that don't need holes.
 
Thanks ggun, but I can't find anything on line. Is there another name besides clamp on lugs, or do u have a site reference thank you
 
Im a little unclear as to exactly what you are doing, but I have found that the bolt patterns for joints and junctions for bussbars in switch boards usually conform to nema patterns. Thus you may be able to bolt on lugs to existing holes, using longer bolts if necessary.
 
SAP said:
Thanks ggun, but I can't find anything on line. Is there another name besides clamp on lugs, or do u have a site reference thank you
Click to expand...

The generator temp power guys use them all the time.
 
electrofelon said:
Im a little unclear as to exactly what you are doing, but I have found that the bolt patterns for joints and junctions for bussbars in switch boards usually conform to nema patterns. Thus you may be able to bolt on lugs to existing holes, using longer bolts if necessary.
Click to expand...

been there done that. inspector bought it.

used grade 8 allen head cap screws, belleville
washers on one side, grade 8 washers on the
the other side, and a grade 8 nylock nut.

appropriate noalox on lug and thread.
hypressed lug. heat shrink tube on lug. ul listed.

he went away happy.

the problem was i had a 3 wire 480 gear, went
thru plan check, and then edison wanted a 4 wire
meter section.
 
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