Bonding jumper size verification.
Project consist of the following. 24" wide by 300' long aluminum cable tray, 12 DC circuits protected by a 225 amp breakers. Largest conductor is a 300 MCM aluminum cable. There are several expansion joints in the cable tray. There is a grounding conductor that is run with each cable set that is a #1 Aluminum cable. This only hits the end of each cable run.
I come up with a #4 copper conductor for bonding the cable tray at the expansion fittings. does this seem correct?
thanks
Project consist of the following. 24" wide by 300' long aluminum cable tray, 12 DC circuits protected by a 225 amp breakers. Largest conductor is a 300 MCM aluminum cable. There are several expansion joints in the cable tray. There is a grounding conductor that is run with each cable set that is a #1 Aluminum cable. This only hits the end of each cable run.
I come up with a #4 copper conductor for bonding the cable tray at the expansion fittings. does this seem correct?
thanks