The oldest NEC version I have "Readilly Accessible" at this time is 1981, and it says about the same thing for Section 230-95 as the 1999 NEC does.
BTW, Section 240-13 does not exist in the '81 NEC - the last entry is 240-12
I have the 1968 City of Los Angeles Electrical Code "Readilly Accessible" - it is based on some version of the NEC, which one is of mystery at this time!
(errata per ammendments is quite ambiguous!).
Anyhow, it does not mention GFPE for Main Service of the infamous 480Y/277 system.
I have seen GFPE Mains on Buildings that date back to mid 1970's, which use the 4 wire Wye service.
Not very many of these services/systems were used at or above 1000 Amps.
The more commonly used 480 VAC 3Ø 3 Wire Ungrounded Delta service/system is found within these 1970's era Structures.
My Father did mention to me that when he did the Playboy Mansion "Remodel" (more like major T.I.!!!), the new Service consisted of a 2500 Amp 480Y/277 VAC 3Ø 4 Wire system - derived from the LADWP's Transformer (4800 VAC Primary x 480Y/277 Secondary) - and the new service had GF Protection.
This was back in 1972 or so.
On a side note, it seems to me that the service size pre-dating the 1981 NEC, may have been 1200 Amps and up.
Is this possible, or am I just looney?
Scott35
