Interconnection - 4000A Switchboard

Status
Not open for further replies.
K

kaveenkw123

Member
Location
NYC
Occupation
Electrical Engineer
Hello,
I have a small 225kW Array that needs to be interconnected to a larger 4000A switchgear. Wanted some input regarding below please.

1.) Incoming service feeders are above ground in the electrical room but I am thinking it will not be feasible to do a feeder tap since 4000A needs multiple sets of conductors.
2.) Any concerns with a Bus Bar tap without a breaker/bucket? I will have a fused diconnect within 10' but I read online about possible void with UL certification but is this addressed in the NEC anywhere?
3.) Is it safe to just specify to do the BUS TAP on the OPPOSITE side from incoming service or is this limited to only having a spare breaker on the opposite end?

Thankyou
 
kaveenkw123 said:
Hello,
I have a small 225kW Array that needs to be interconnected to a larger 4000A switchgear. Wanted some input regarding below please.

1.) Incoming service feeders are above ground in the electrical room but I am thinking it will not be feasible to do a feeder tap since 4000A needs multiple sets of conductors.
Click to expand...
What is a "service feeder"? These conductors are either service conductors or feeders, and the rules for dealing with them are different.
 
ggunn said:
What is a "service feeder"? These conductors are either service conductors or feeders, and the rules for dealing with them are different.
Click to expand...
hmm. I was referring to the wires between the utility xfmr and the service disconnect. So they are feeders thus I refered to them as "Service Feedrs" if that provides some clarity. I was considering Tapping ahead of the the service disconnect and the meter
 
kaveenkw123 said:
hmm. I was referring to the wires between the utility xfmr and the service disconnect. So they are feeders thus I refered to them as "Service Feedrs" if that provides some clarity. I was considering Tapping ahead of the the service disconnect and the meter
Click to expand...
Please see the NEC definition for proper terminology. They are either service conductors or feeders👍🏿

See this document for some guidance:


Your AHJ might be ok with a tap utilizing existing holes or bolting lugs to a joint without a field evaluation, but it's up to them.
 
kaveenkw123 said:
hmm. I was referring to the wires between the utility xfmr and the service disconnect. So they are feeders thus I refered to them as "Service Feedrs" if that provides some clarity. I was considering Tapping ahead of the the service disconnect and the meter
Click to expand...
The service conductors will be in parallel, so you have to find a way to connect your tap to all of the sets of service conductors if you do that.
 
kaveenkw123 said:
hmm. I was referring to the wires between the utility xfmr and the service disconnect. So they are feeders thus I refered to them as "Service Feedrs" if that provides some clarity. I was considering Tapping ahead of the the service disconnect and the meter
Click to expand...
Service conductors, but not feeders.
 
kaveenkw123 said:
Hello,
I have a small 225kW Array that needs to be interconnected to a larger 4000A switchgear. Wanted some input regarding below please.

...
Click to expand...

What voltage? It sounds to me like your system is small enough to do a load side connection without getting involved in supply side connections or busbar taps.
 
Status
Not open for further replies.
Top