ECN Forum Forums Code Related Discussion Building Codes for Electricians Running romex in same joist space as water?

I had a HO/plumber who forbid me from running romex in the same stud/joist space as his copper pipes. He claimed electrolisis (sp?) causing pinholes in his copper. He was/is the only plumber that ever identified this as a problem. BTW I run romex in the same bays as plumbing.