bdosborn wrote:
NEC 551
(C) Bonding Voltage Converter Enclosures. The non–current-carrying metal enclosure of the voltage converter shall be bonded to the frame of the vehicle with a minimum 8 AWG copper conductor. The voltage converter shall be provided with a separate chassis bonding conductor that shall not be used as a current-carrying conductor.
This seems to be saying that the converter box needs to be connected to the frame. But then the next sentence looks like it indicates that the converter machine also needs to connect. Is that what it actually says? Grr passive obfuscating language.
bdosborn wrote:I bonded my converter to the frame and it works perfectly. I also don't have to worry about getting electrocuted by touching the frame if a hot wire somehow energizes it. The ground ensures that there is a low impedance path back to the breaker so it opens as soon as a hot wire touches the frame. An ungrounded frame will remain energized if a hot wire touches it. This means that you are the path to ground if you touch it and, unfortunately, you are a high impedance path and the breaker may never open.
8ball_99 wrote:You always bond the ground from AC to the the frame.. That way if you have a hotwire make contact with the frame the current has a path to ground.. If you don't do this and a hotwire contacts the frame when you step in our out of the trailer you could become the path to ground.
So do I bond negative from the converter to the frame or from AC ground to the frame? Or is it sixes as long as the current can get all the way back to AC ground?
