cdcengineer
Senior Member
The local utility requires cold sequencing for single phase commercial metering installations.
The local electrical inspector is convinced that if you have for example a 200 Amp, 1-Phase, self-contained metered service than you must have a separate service disconnect.
Our application has the "service equipment" rated 200 Amp disconnect located outside the building directly adjacent to the utility meter. I see nothing in the NEC that says that the cold sequence disconnect cannot be service disconnect. The installer would be required to provide GEC at the disconnect and bond the neutral to ground at this point. From there inward we would need a EGC which would ground the meter housing. At the main panel there would be no bond.
Some utilities will not allow the customer to operate the cold sequence disconnect because they want to ensure that the meter stays hot. beyond that I can't argue against it.
Anyone want to chime in?
Thx - DC
The local electrical inspector is convinced that if you have for example a 200 Amp, 1-Phase, self-contained metered service than you must have a separate service disconnect.
Our application has the "service equipment" rated 200 Amp disconnect located outside the building directly adjacent to the utility meter. I see nothing in the NEC that says that the cold sequence disconnect cannot be service disconnect. The installer would be required to provide GEC at the disconnect and bond the neutral to ground at this point. From there inward we would need a EGC which would ground the meter housing. At the main panel there would be no bond.
Some utilities will not allow the customer to operate the cold sequence disconnect because they want to ensure that the meter stays hot. beyond that I can't argue against it.
Anyone want to chime in?
Thx - DC