I'm no EE but "power isolation" to me says transformer. Lots of ways to do this.
Before the panel, feeding it 240V, you could use a 240/480-120/240 shielded transformer in the 5 to 10 KVA range (40A minimum), for example:
After the panel, you could use multiple smaller isolation transformers. For 115V in, Topaz, MGE and Phoenix brands are a popular way to go but can get expensive.
With the lights on the "other" leg of the 240V, no problem.
Ngjockey (Threads | Answers | This Thread)