E57, regarding the OCPD issue, using my set-up as an example:

[Linked Image from mysite.verizon.net]

What if a 50A main breaker enclosure were installed in between the ATS and the genset disco, similar to the one shown below:

[Linked Image from foxelectricsupply.com]

Now the genset and wiring would be covered. I was considering such a configuration at first (you'll note I have room on my board) using a GE 70A enclosure with a 50A 2-pole breaker, but my friend who does lots of genset installs (mainly commercial) said my idea was "retarded" because the genset breaker and electronics provides protection. I could've also used a fused disco, but my supply house didn't have it in stock. Besides, like my friend said, why should I care about protecting less than 10' of cable; if anything, the genset wiring will burn up first long before the #4 in this app.

Funny you should mention disasters... ready for that too: If the natural gas goes out, I've got two 30# LP tanks and an adjustable regulator with a 3/4" connection for just such an emergency. That along with two 20# for the BBQ and I've got 10 hours of fuel minimum at full load (240,000 BTU) if my math is right. Granted, if there were such an emergency, the genset would be operated sporadicaly to conserve fuel.

One of the basic premises behind this discussion is if the genset overloads, and shuts down, the system is not truly automatic, hence not doing what it was designed to do. My question is why does EVERY fault have to result in shutdown and lockout? Why can't the manufacturers modify the firmware to automatically restart the genset say 2-3 times maximum after a brief delay if it's only a simple overload? Of course you'd want the genset to lockout on low oil, temp, or other serious issue... but for a momentary surge the genset? Doesn't make sense.

I think this simple change would go along way with the proposed 702.5, but obviously that won't do much to help the manufacturers bottom line, which I'm beginning to believe is the intent of the proposed changes.

Joe