Timeline for What is the correct wiring (including Ground) for two main load centers plus transfer switch?
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| Oct 20, 2020 at 15:58 | comment | added | Vette | Let us continue this discussion in chat. | |
| Oct 20, 2020 at 13:47 | comment | added | Vette | Thanks! Re: Gas vs Elec: Many reasons but too much to type here; maybe I could start another topic, as this thread is focused on the electrical requirements. Re: Neutral Screw: I was planning on using se.com/us/en/product/QO130M200PC Does it come w/ neutral bonding screw by default? I thought that had to be manually added if you wanted to bond neutral to ground (e.g. for Panel A)? For Panel B, I was just going to buy a grounding bus and screw it into the panel per manufacturer instructions. | |
| Oct 20, 2020 at 2:23 | comment | added | ThreePhaseEel | @Vette -- and last but not least, yes, your revised diagram is correct regarding how the neutrals and grounds run; just make sure to pull the neutral bonding screw out of panel B! | |
| Oct 20, 2020 at 2:20 | comment | added | ThreePhaseEel | @Vette -- re #3: I generally design to the latest model Codes whenever possible as I consider it a good idea to do so even if/when your county/state/... is well behind the times. (This of course excludes places like NYC or Chicago with very unique local requirements.) | |
| Oct 20, 2020 at 2:15 | comment | added | ThreePhaseEel | @Vette -- re #2: the "whole house transfer switch" name really means that the transfer switch is configured/rated to serve as a service disconnecting means and doesn't have anything to do with anything regarding how much load you can put on it, that's determined solely by the amp rating of the switch | |
| Oct 20, 2020 at 2:14 | comment | added | ThreePhaseEel | @Vette -- re: #1, I was not aware of the 100A version of the SMM, thanks for pointing that out. I'm still not sold on electric tankless HWH (big swingy loads are harder for utilities to manage than something steadier) -- is there a reason you're OK with burning gas to heat your house, but not for water heating? | |
| Oct 19, 2020 at 18:31 | vote | accept | Vette | ||
| Oct 19, 2020 at 18:28 | comment | added | Vette | I have created a new diagram per your recommendations for #2. I will bond neutral to ground in Main Service Panel A & also in the Transfer Switch. I will use a separate ground bus in Main Service Panel B and pass ground through to the Transfer Switch. Is this correct? | |
| Oct 19, 2020 at 18:28 | comment | added | Vette | Very Helpful! #1. Several Options. Generac 100A SMM (#7006) w/ 75A water heater. Or 50A SMM w/ 30A water heater. Or if absolutely necessary, delete the 75A tankless. #2. That was my main concern. Thanks! But I would still have this problem even with fewer tankless heaters. The generator load would still need a whole-house transfer switch (as it will have > 1/2 the house on it anyway.) #3. Indiana uses 2008 NEC. So 230.85 N/A …comments continued below… | |
| Oct 16, 2020 at 2:48 | history | answered | ThreePhaseEel | CC BY-SA 4.0 |