Old 1950's - 60's 120/240 High Leg No Main, Proper N-G Bond location???

Joethemechanic

Joethemechanic

Senior Member
Location
Hazleton Pa
Occupation
Electro-Mechanical Technician. Industrial machinery
Meter feeds into a trough, there are 4 fused disconnects above the trough feeding subpanels located around the building.

Where does the N-G bond belong? In the trough? In one of the fused disconnects?
 
electrofelon said:
All of them, and also anything upstream
Click to expand...

I was thinking all four. Right now I think there is one in the trough, and I know there is a ground rod and a bond at each of the 4 sub panels, but before I lift the ones at the subpanels, I want to make sure it's done right at the service
 
Joethemechanic said:
Where does the N-G bond belong? In the trough? In one of the fused disconnects?
Click to expand...
In all of the service disconnects.
250.24 (C) Main Bonding Jumper.
For a grounded system, an unspliced main bonding jumper shall be used to connect the equipment grounding conductor(s) and the service-disconnect enclosure to the grounded conductor within the enclosure for each service disconnect in accordance with 250.28.
Click to expand...
 
I think I see what they did here. N-G bond in the trough. Fused discos have no neutral or ground bar, neutral just passes through each disco, and everything is done in rigid
 
Joethemechanic said:
Not the case here, but what if there was no neutral going to the disco? Suppose it was just the 3 phase conductors? To be compliant would you have to run a neutral to that disco's enclosure and bond it?
Click to expand...
What is not the case?

Yes a neutral (,grounded conductor) must be run to each service disconnect for a grounded system. Even if the neutral is not being used , you need for bonding and fault clearing. The code in theory could allow a different color in those cases and not call it a grounded conductor, like you can do for an SDS, not sure why they don't.
 
don_resqcapt19 said:
Then they are not listed as suitable for use as service equipment.
Click to expand...
I better check before I plan farther. If I have to replace them I'm just going to use a small 3 phase breaker panel with spaces for six 3 phase breakers. I think I have a new one in one of my storage containers
 
Joethemechanic said:
I better check before I plan farther. If I have to replace them I'm just going to use a small 3 phase breaker panel with spaces for six 3 phase breakers. I think I have a new one in one of my storage containers
Click to expand...
Note that depending on what code you are on, the panel board would need a main breaker as service disconnects are no longer allowed to be in the same enclosure.
 
electrofelon said:
Note that depending on what code you are on, the panel board would need a main breaker as service disconnects are no longer allowed to be in the same enclosure.
Click to expand...
I just checked the fused discos and they are labeled as "suitable for service equipment" so I plan to keep them. there are two Square Ds and two FPEs. One of the Square Ds does have a neutral/ground bar. The other three discos look like there was never one installed or someone removed them
 
Joethemechanic said:
I just checked the fused discos and they are labeled as "suitable for service equipment" so I plan to keep them. there are two Square Ds and two FPEs. One of the Square Ds does have a neutral/ground bar. The other three discos look like there was never one installed or someone removed them
Click to expand...
Yeah I wouldn't bother replacing them unless there was something wrong with them.
 
You must log in or register to reply here.
Top