beanland
Senior Member
- Location
- Vancouver, WA
I need to have a protective relay panel built to comply with utility interconnection requirements that will interface with a photovoltaic system; it is designed as backup protection to trip the main breakers in the switchgear by sensing voltage and frequency. It does not interface with the PV inverters at all; except by turning off the power. The UL508A panel shop I asked to quote says they cannot build the panel because UL 508A says:
"1.16 Equipment for the control of fuel cells, photovoltaic systems, or utility interactive systems are covered by the Standard for Inverters, Converters, Controllers and Interconnection System Equipment for Use with Distributed Energy Resources, UL 1741."
I am perplexed. I agree that UL 1741 covers the inverter. But, does UL 1741 also cover a protective relay panel that trips a breaker in switchgear? Does this mean I have to go to a UL 1741 certified panel shop to have the panel built? Is there any such thing as a UL 1741 panel shop?
Any one else have any experience with this?
"1.16 Equipment for the control of fuel cells, photovoltaic systems, or utility interactive systems are covered by the Standard for Inverters, Converters, Controllers and Interconnection System Equipment for Use with Distributed Energy Resources, UL 1741."
I am perplexed. I agree that UL 1741 covers the inverter. But, does UL 1741 also cover a protective relay panel that trips a breaker in switchgear? Does this mean I have to go to a UL 1741 certified panel shop to have the panel built? Is there any such thing as a UL 1741 panel shop?
Any one else have any experience with this?