Service disconnect

[hhsting]

I have main service disconnect fused at 600A. Cold sequence metering is used so I have Load side of main service fused disconnect 600A 8#500MCM AL going in trough 12x12. From trough 4#3/0 and 1#3/0 grd tap to utility meter then to 200A fused disco which then feeds tenant.

Question:

1. Don’t I need equipment grounding conductor load side of 600A fused disco in trough? So instead of 8#500 MCM AL I would have 8#500MCM + 1#2/0 grd Al or just 9#500MCM Al in trough?

2. With 600A disconnect can I tap 200A no matter what length 10 ft or 25ft?

 

[electrofelon]

1. Maybe. The raceway and wireway could be an acceptable EGC. See 250.118.

2. IF you meet the requirements for whichever tap rule then you are good to go.

Might want to confirm POCO is ok with the arrangement, particularly if cold sequenced.

 

[don_resqcapt19]

Is the cold sequence disconnect switch the service disconnect? With our utility, it is not permitted to be the service disconnect as they seal and lock it.
Don't understand the need for cold sequence meter disconnect on a 600 amp service. I thought the largest self contained meter was 400 amps? You don't need a cold sequence meter disconnect for a CT meter.

 

[hhsting]

Is the cold sequence disconnect switch the service disconnect? With our utility, it is not permitted to be the service disconnect as they seal and lock it.
Don't understand the need for cold sequence meter disconnect on a 600 amp service. I thought the largest self contained meter was 400 amps? You don't need a cold sequence meter disconnect for a CT meter.

The total service is 1200A. There are two fused main service 600A discos.. The utility meter is downstream of one of the 600A main service fuse discos and the utility meter is 200A and its metering 200A fused disco.

The main service 600 fused disco has grounding electrode system. So how can it have that and be called main service disco. The utility service conductors terminate in the main service fused 600A disco

 

[electrofelon]

The total service is 1200A. There are two fused main service 600A discos.. The utility meter is downstream of one of the 600A main service fuse discos and the utility meter is 200A and its metering 200A fused disco.

The main service 600 fused disco has grounding electrode system. So how can it have that and be called main service disco. The utility service conductors terminate in the main service fused 600A disco

How many meters total are there?

Sounds like you have two service disconnects per 230.40 ex #2 so you would look at 250.64(D) for how to connect the GEC. You have asked lots of questions about 250.64(D) in the past so you should be very familiar with it.

 

[hhsting]

How many meters total are there?

Sounds like you have two service disconnects per 230.40 ex #2 so you would look at 250.64(D) for how to connect the GEC. You have asked lots of questions about 250.64(D) in the past so you should be very familiar with it.

How many meters total are there?

Sounds like you have two service disconnects per 230.40 ex #2 so you would look at 250.64(D) for how to connect the GEC. You have asked lots of questions about 250.64(D) in the past so you should be very familiar with it.

Total meters are 4. Don’t have any questions on 250.64(D) or 230.40 ex #2.

Post #1 Questions about equipment grounding conductor size, tap conductor only

 

[electrofelon]

The main service 600 fused disco has grounding electrode system. So how can it have that and be called main service disco.

Sounded to me like you are not clear on 250.64(D) and 230.40 ex #2. Perhaps I misunderstood the question.

 

[hhsting]

Is the cold sequence disconnect switch the service disconnect? With our utility, it is not permitted to be the service disconnect as they seal and lock it.
Don't understand the need for cold sequence meter disconnect on a 600 amp service. I thought the largest self contained meter was 400 amps? You don't need a cold sequence meter disconnect for a CT meter.

Don why wouldn’t 600A fused disco be service disconnect? It has grounding electrode system and utility service conductor connect to it line side. With ours utility connect and terminate service conductors first disconnect.

 

[don_resqcapt19]

Don why wouldn’t 600A fused disco be service disconnect? It has grounding electrode system and utility service conductor connect to it line side. With ours utility connect and terminate service conductors first disconnect.

If this was a utility required meter disconnect, it cannot be the service disconnect in my area because the utility will lock and seal it, preventing the required occupant access to the service disconnect. That is not the same with all utilities. The concern is the easy theft of power with a disconnect on line side of the meter. The locking and sealing eases that concern.

If it is the service disconnect then every thing on the load side is a feeder and will require an EGC.
There will be no main bonding jumper in the load side disconnects. Most meters have the neutral bonded to the meter enclosure, but that is permitted by EX #2 to 250.142(B).