What is considered a service panel?
- Thread starter kjroller
- Start date
- Location
- New Jersey
- Occupation
- Journeyman Electrician
Is the SDS provided by a utility company?
jtinge
Senior Member
- Location
- Hampton, VA
- Occupation
- Sr. Elec. Engr
By definition a Panel connected to a separately derived system is not a Service Panel.
Separately Derived System. An electrical power supply output, other than a service, having no direct connection(s) to circuit conductors of any other electrical source other than those established by grounding and bonding connections.
Service. The conductors and equipment connecting the serving utility to the wiring system of the premises served.
Separately Derived System. An electrical power supply output, other than a service, having no direct connection(s) to circuit conductors of any other electrical source other than those established by grounding and bonding connections.
Service. The conductors and equipment connecting the serving utility to the wiring system of the premises served.
- Location
- New Jersey
- Occupation
- Journeyman Electrician
What if it's a utility transformer?
wwhitney
Senior Member
- Location
- Berkeley, CA
- Occupation
- Retired
Since the definition of SDS excludes services, whether the secondary of a transformer is an SDS or not depends on the location of the service point. You could have identical electrical configurations where the service point is on the secondary side of the (utility-owned) transformer, and you have a service; or the service point is on the primary side of the (customer-owned) transformer, and the transformer secondary is an SDS.
Cheers, Wayne
jaggedben
Senior Member
- Location
- Northern California
- Occupation
- Solar and Energy Storage Installer
Do you people call a panel with the main disconnect for an SDS a 'subpanel'?
I mean, 'subpanel' is not a code term, so it means whatever people use it to mean. I think it clearly is appropriate for a panel that isn't either service equipment or the main disco for a separately derived system. I think it definitely does not mean a service panel. If I wanted to be super clear about things, I'd also avoid using 'subpanel' for a panel that contained the first disconnecting means for an SDS.
I mean, 'subpanel' is not a code term, so it means whatever people use it to mean. I think it clearly is appropriate for a panel that isn't either service equipment or the main disco for a separately derived system. I think it definitely does not mean a service panel. If I wanted to be super clear about things, I'd also avoid using 'subpanel' for a panel that contained the first disconnecting means for an SDS.