Doesn’t take much for a back feed to end a life. This was always our greatest fear when we were doing paper mill maintenance outages and there were thousands of little generators scattered all over the place. A few milliamperes is fatal given the right path through the body, and the step down transformer for a service drop is a step up just as well.It’s a manual breaker setup inside to isolate from the utility. Partly because I don’t know for a fact what code is here and partly because there’s enough power involved to kill a person or three, I hired a licensed electrician to spec it and install it. My only instructions were whatever he installed had to meet code regardless the cost.
What you have is the minimum requirement here as well. Transfer switches (auto or manual) are a bit pricier than the usual mechanical lockout for two breakers. I want to replace my meter socket with an outdoor distribution panel and socket combo to add a 200A disconnect outside the house (required for all new construction) and feed the existing panel inside from that with a 100A breaker. Apparently the service tri-plex is rated for 400A (I asked) and the power company replaced the transformer just last year with a larger unit. The 1978 version kinda bit the dust. That would allow me to run a new circuit to my shop to get a little more capacity out there and add a split unit to cool it in the summer. It would also allow me to do exactly what you have with a manual interlock for isolation. I’m a retired field service electrical engineer for heavy industry, so I’m probably not going to need an electrician. Don’t have to have a license to work on your own property in this area but may have to get a permit. I can get everything I need at several suppliers around here. It’s probably harder to schedule the power company to disconnect it in the morning and return to reconnect when I’m done with the mods. I have to get it completely disconnected before I can start because there’s no disconnect between the meter and the inside distribution panel. The meter socket sits right on top of the wire going to the distribution panel. Hindsight is 20/20. I had to replace the socket about 8 years ago when the power company swapped out all the old meters with new smart meters. They didn’t seat the new meter correctly and it blew out the stabs on one side. Of course, the socket belongs to me, doesn’t it. I didn’t think quite far enough ahead and I was a bit rushed to get the power back on, so didn’t do the upgrade then. Exterior isolation is now required for any service modifications because of new fire codes. If I add an outdoor connection for a generator, it would be another selling point if we decide to sell and move. One more thing it would do is make it a lot easier to add solar power to the house if we decide to stay.

































