ggunn
PE (Electrical), NABCEP certified
- Location
- Austin, TX, USA
- Occupation
- Consulting Electrical Engineer - Photovoltaic Systems
I have a 100kW inverter feeding a 480V three phase AC combiner through 175A breakers. What size copper EGC do I need and how did you arrive at that number?
Is it #6 (from Table 250.122 for 100-200A)? What does "ahead of" mean in this situation (it's an ambiguous term in any case)? It seems to me that the OCPD's are "behind" the inverter.
The combiner takes the output from two 100kW inverters and feeds the service through a disco with 350A fuses. What size EGC do I need from the combiner to the service? Is it #3 (from Table 250.122 for 300-400A)?
Is it #6 (from Table 250.122 for 100-200A)? What does "ahead of" mean in this situation (it's an ambiguous term in any case)? It seems to me that the OCPD's are "behind" the inverter.
The combiner takes the output from two 100kW inverters and feeds the service through a disco with 350A fuses. What size EGC do I need from the combiner to the service? Is it #3 (from Table 250.122 for 300-400A)?
