2 micro inverter systems in one conduit

Z

Zee

Senior Member
Location
CA
Can I run the Enphase circuits for 2 ADU's in the same conduit?
(Both PV arrays go on the roof of main house because it has the 4-meter bank for all 4 units. 2 detached ADUs are in the back. Each PV system goes to a separate Combiner Box and service.)
 
Zee said:
Can I run the Enphase circuits for 2 ADU's in the same conduit?
(Both PV arrays go on the roof of main house because it has the 4-meter bank for all 4 units. 2 detached ADUs are in the back. Each PV system goes to a separate Combiner Box and service.)
Click to expand...
If the two circuits feed two different services, I don't think so.
 
It sounds like you have a four meter single service and I can't find anything that says you can't do what you want to do. Since you have multiple meters fed from one roof make sure everything is RSD compliant.
 
FWIW, since I doubt your job is there, San Francisco has a local ammendment that would prohibit this. It's actually worded to refer to meters not services. Otherwise I'm almost certain there's no NEC or Cali code that would prohibit what you want to do. It may slightly complicate 225.32 considerations but I still see ways to be compliant.

ggunn said:
No reference; just a guess.
Click to expand...
Incorrect guess AFAIK.
 
  • Like
Reactions: Zee
San Francisco has an interesting local electrical code. Not that many cities do their own code but something to be aware of.
 
pv_n00b said:
San Francisco has an interesting local electrical code. Not that many cities do their own code but something to be aware of.
Click to expand...
They don't actually do their own code they just have an unusually large number of significant ammendments that are vestiges from when they did actually did their own code decades ago.
 
jaggedben said:
They don't actually do their own code they just have an unusually large number of significant ammendments that are vestiges from when they did actually did their own code decades ago.
Click to expand...
Yes, it's a modified CA electrical code, which is a modified NEC, but it's still their electrical code that they made. Not following it can cause a lot of problems. The county of Los Angeles has their own electrical code that is a modified CA electrical code. Got to keep an eye out for these.
I used to live in a small city that did not have it's own electrical code but the municipal electric utility banned supply side PV interconnections. You did not find out about this until you read their interconnection requirements.
 
pv_n00b said:
the municipal electric utility banned supply side PV interconnections
Click to expand...
An inane restriction. Did they also regulate the number of service disconnects beyond what the NEC allows? If not, just throw a little night light on your supply side interconnection and call it a second service disconnect with a load-side interconnection.

Cheers, Wayne
 
wwhitney said:
An inane restriction.
Click to expand...
I know of a couple of jurisdictions relatively nearby where supply side PV interconnections are not allowed, and one where supply side interconnections are the only ones permitted. There is even one where any PV interconnections must be made outside the customer's meter with its own meter. The last company I worked for maintained an on line spreadsheet that documented the unique rules and regulations regarding PV systems for every jurisdiction we operated in. The last time I saw it it was four or five sheets long.
 
Zee said:
Can I run the Enphase circuits for 2 ADU's in the same conduit?
(Both PV arrays go on the roof of main house because it has the 4-meter bank for all 4 units. 2 detached ADUs are in the back. Each PV system goes to a separate Combiner Box and service.)
Click to expand...
If the 2 systems have separate Envoys, I would keep physical separation of the wiring from each and not put in the same conduit to prevent powerline communication crosstalk.
 
  • Like
Reactions: Zee
wwhitney said:
An inane restriction. Did they also regulate the number of service disconnects beyond what the NEC allows? If not, just throw a little night light on your supply side interconnection and call it a second service disconnect with a load-side interconnection.
Click to expand...
I've found that things can get weird with municipal utilities. There can be little or no separation between the utility and the city building department so the utility engineers can dictate some of the local building code requirements.
 
You must log in or register to reply here.
Top