George
Yes the current rules in the 2009 Canadian code does require the bond (equipment ground) wire to be sized according to the circuit wire size and use table 16.
So if the load was 12 amps but it was far enough away to need a bigger wire than #14 then the bond wire must get bigger too.
In the CEC before 2009 the bonding wire never had to get any bigger than #14 because the circuit was connected to a 15 amp breaker and it was the breaker or fuse size that used to determine the bond wire size.
The new way compensates for voltage drop on the bond wire and the old rule did not. So the old way was like adding a resistor to a fault a long way out from the source and did cause longer trip or longer fusing.
I think the NEC has always had this one right and the CEC only just got it right in 2009.
