Here's a question I'm trying to get clarity on. Say you have a corridor with an automatic on occupancy sensor controlling the lighting. Some of the fixtures have an integral UL 924 compliant transfer device which transfers to a 90 minute battery source within the fixture. On top of that as an added level of redundancy/performance you put this circuit on a standby generator. The sequence would be outage, followed by the battery operation, then the generator would kick in and take over. So the question is, is it ok for a standby generator to power the emergency lighting if they are equipped with battery packs designed to take the workload if the generator fails? I believe after an outage an occupancy sensor defaults to on for 30 minutes. I've heard differing opinions.