are you sure that they are 3 phase?
and not single phase (2 pole breaker) ?
ive not seen any 3 phase lights, and cannot think of a reason why one would need one.....
I have to ask this because it could apply to the op's question. Does 410.130(G)3 apply to 410.130(G)1 or does it apply to 410 part XIII?
Rick
the service is 480/277 v they are hook up to a 2 pole breaker