i am back in a very similar problem,
im doing electrical work in minnesota, this is a rural farmstead, the main 220 volt/200 amp power comes from a pole mounted meter, its a 3 wire (installed 1991) that goes to a junction box, no outbuildings are near each other and no metal or other contact. then that junction box feeds 4 lines, each is 200 amp wire 3 wire that runs to 4 buildings, (metal quanset, house, shed, shed), each building has a breaker box of 100 amps 3 wire. so i assume all code in 1991.
the wiring jobs looks excellent. but i see the breaker boxes have the neutral and the ground on the same bar. (1991 i assume).
ok so my job is this.
new structure, i ran a 60 amp sub box 4 wire h, h, n, g. in the new structure, i put 2 ground rods next to that building 6 feet apart rods ground wire goes into the 60 amp box, then it runs to the main breaker box in the house. i have not hooked into the house box yet, well if i hooked h, h, n, g to the house breaker panel, then neutral and ground and hooked both connected to neutral correct? in the house breaker panel (1991 install) neutral and ground are not separate, but what am i missing here?
each out building has a ground rod hooked to the ground wires and bonded to the breaker box, the neutral and grounds are connected together. i know 2023 code says connect 4 wire run, not connect neutral or grounds together at panel, there is to much distance and cost to redig and install another wire, so in each outbuilding the old code is that safe?
I’m dealing with old code 1990 and new code 2023 the ahj is not very helpful, and suggestions? i think I’m missing something…
thanks!
sam
im doing electrical work in minnesota, this is a rural farmstead, the main 220 volt/200 amp power comes from a pole mounted meter, its a 3 wire (installed 1991) that goes to a junction box, no outbuildings are near each other and no metal or other contact. then that junction box feeds 4 lines, each is 200 amp wire 3 wire that runs to 4 buildings, (metal quanset, house, shed, shed), each building has a breaker box of 100 amps 3 wire. so i assume all code in 1991.
the wiring jobs looks excellent. but i see the breaker boxes have the neutral and the ground on the same bar. (1991 i assume).
ok so my job is this.
new structure, i ran a 60 amp sub box 4 wire h, h, n, g. in the new structure, i put 2 ground rods next to that building 6 feet apart rods ground wire goes into the 60 amp box, then it runs to the main breaker box in the house. i have not hooked into the house box yet, well if i hooked h, h, n, g to the house breaker panel, then neutral and ground and hooked both connected to neutral correct? in the house breaker panel (1991 install) neutral and ground are not separate, but what am i missing here?
each out building has a ground rod hooked to the ground wires and bonded to the breaker box, the neutral and grounds are connected together. i know 2023 code says connect 4 wire run, not connect neutral or grounds together at panel, there is to much distance and cost to redig and install another wire, so in each outbuilding the old code is that safe?
I’m dealing with old code 1990 and new code 2023 the ahj is not very helpful, and suggestions? i think I’m missing something…
thanks!
sam
