mwalsh wrote:Would you pass along the arguments that won the city engineer over? I also didn't install a LOS disconnect. However, I got the impression from reading the CEC that I needed one...but just didn't want one.
1st Visit: City Engineer, "You need a line-of-sight disconnect." I ask, "Why". City Engineer, "It was needed in the two previous installations of car chargers". I ask, "Is this required by the California Electric Code". City Engineer, "I think so". I ask, "Can you show me the section of the code?" City Engineer, "I'll have to research it."
I go home and do research of my own, as I did not want the trouble/expense/ugliness of a line-of-sight disconnect. I found a document published by Pacific Gas and Electric
( http://www.pge.com/includes/docs/pdfs/s ... ev5pt3.pdf
) discussing the Code Requirements for Installing EVSE.
In this document they quote the California Electric Code section 625.23 [CEC 625.23]. I print out a copy of this document to take to the City Engineer.
2nd Visit: I show the PG&E document to the City Engineer, and ask him if we both may read CEC 625.23 together. He retrieves the code book form his office, and after we both read the section under EVSE Used in Level 2 Installations
; "For EVSE rated at more than 60 amps or more than 150 volts to ground, a means of disconnect must be installed in a readily accessible location and within sight of the electric charging connector." City Engineer, "O.K. it looks like you don't need a line-of-sight disconnect".
I go home and finalize my drawings and make copies for submittal.
3rd Visit: City Engineer, "I re-read the code and you DO need a line-of-sight disconnect." Realizing that this was becoming a minor battle, I chose my words carefully. I said, "Can't we discuss this some more, because when I read the electric code it is clear to me that the line-of-sight disconnect is not required." He then points at my drawing and says, "Look, on your own drawing you show the supply voltage to the charger is 240VAC, which is more than 150 volts; the disconnect is required." I said, "I agree the supply voltage is 240VAC, the supply to my house is 240VAC Line-to-Line; but Edison's transformer that feeds my house is center-tapped (as all modern houses are supplied), and that center-tap is earth-grounded; thus from earth-ground to any wire in my house, the potential is 120VAC. The code says "150 volts to ground", and the car charger is 120 volts to ground." The City Engineer then left to discuss the issue with someone else for about 20 minutes. Upon his return, he agreed that I had interpreted the Code correctly, and he issued the permit.