Hedges
I See Electromagnetic Fields!
- Joined
- Mar 28, 2020
- Messages
- 20,795
I just moved input of fused visible blade disconnect (the AC input of my Sunny Islands) from breaker to something like a line side tap. Not really, because there is one more 200A breaker at the meter, but before the 200A breaker of the panel. This gets me away from 120% rule (70A for my panel). That's plenty for PV, but I wanted more pass-through to feed house. I can still backfeed this panel if I want to feed loads on it, but don't have to remember to switch off the breaker which used to feed the Sunny Islands and PV.
If you actually have a line-side tap, the OCP must be sufficient to interrupt the fault current utility could deliver (probably something under 22kA, which is what main breakers are rated for), and do it so fast that 10kA rated branch breakers don't get killed. Mine has FRN-R-100, which seems to have pretty decent specs. 200kA interrupting, and 10kA let-through up to 150kA fault.
My boxes, and Polaris connectors for splice.
I don't particularly trust that breaker, and was going to mount Class-T downstream from it. Coordinated to trip first for short-circuit, but not for overload. Couldn't shoehorn it in, and need all the space for bending wires. At least the breaker is replaceable by plug-on, with utility hot.
If you actually have a line-side tap, the OCP must be sufficient to interrupt the fault current utility could deliver (probably something under 22kA, which is what main breakers are rated for), and do it so fast that 10kA rated branch breakers don't get killed. Mine has FRN-R-100, which seems to have pretty decent specs. 200kA interrupting, and 10kA let-through up to 150kA fault.
My boxes, and Polaris connectors for splice.
I don't particularly trust that breaker, and was going to mount Class-T downstream from it. Coordinated to trip first for short-circuit, but not for overload. Couldn't shoehorn it in, and need all the space for bending wires. At least the breaker is replaceable by plug-on, with utility hot.