Well son, in some places they use the same wire for both neutral and earth, in the suppliers equipment, these being separated in the consumers installation.
Since water pipes should be bonded to the earth wire, some of the neutral current returns via the neutral wire, and some via the water pipes. Note that neutral current from neighbours may return via your water pipes. Such current therefore still flows when your installation is isolated.
60 amps sounds an awful lot though. I would be most reluctant to disconnect any earthing or bonding connection that was carrying 60 amps. A dangerous voltage could result, even with the main fuse removed. 60 amps is also a fire risk if it passes through any small conductors or any imperfect connections.
Well son, in some places they use the same wire for both neutral and earth, in the suppliers equipment, these being separated in the consumers installation.
Since water pipes should be bonded to the earth wire, some of the neutral current returns via the neutral wire, and some via the water pipes. Note that neutral current from neighbours may return via your water pipes. Such current therefore still flows when your installation is isolated.
60 amps sounds an awful lot though. I would be most reluctant to disconnect any earthing or bonding connection that was carrying 60 amps. A dangerous voltage could result, even with the main fuse removed. 60 amps is also a fire risk if it passes through any small conductors or any imperfect connections.
