This afternoon I finally got a chance to see and quickly review the NETA site, and other links. What I'm dealing with is justifying a pm schedule for the electrical service and distribution panelboards and associated transformers and wiring for office buildings that are at least 10 years old. I see a 3 to 6 year pm frequency listed throughout the 70B table for low voltage equipment, along with some scattered comments to "follow manufacturer's maintenance instructions". Are such maintenance instructions readily available, and are they practical? Or is this something that only electrical test companies are privy to? How do I find info that tells me that a certain brand and model of drawout breaker is likely to fail after x years? I suspect that this is more of an 'insider's specialty', and that the manufacturers aren't about to share that sort of failure info if they don't have to.
I realize that I'm fishing for concrete answers where there might not be any, but I appreciate any input offered. Thanks