Been reading up on grounding requirements in my region, but am rather confused about the 2015 code.
Rule 10-700 of the Canadian Electrical Code states that
Rod electrodes must consist of at least two manufactured rod electrodes. Rods must
• be at least 3 m long (as required by CSA C22.2 No. 41);
• be driven into the earth to their full length and spaced no less than 3 m apart; and
• be bonded together by a grounding conductor sized in accordance with Rule 10-812 (4 AWG Aluminum or 6 awg copper).
It further states that:
10-602 Dissimilar metals Where dissimilar metals cannot be avoided at bonding connections as indicated in Rule 2-112(2), connections
shall be made using methods or material that will minimize deterioration from galvanic action.
But does not give any examples. In this old outdated Lighting rod code (R.R.O. 1990, Reg. 712: GENERAL) it states that you can use galvanized steel rods 10 feet into the ground with aluminum cable and aluminum or galvanized iron connectors connected 6 inches above grade.
But looking at products available, I can find zink, copper, bronze grounding rod connectors, but not galvanized iron or aluminum. Similarly, I cannot connect the conductor 6 inches above grade if I need to drive the rod into the earth to its full length as specified (not that the code seems to care where I connect the conductor to the grounding rod).