In most cases, when a service exceeds 200 amps the utility company will require CTs in order to run a smaller current through their meters. In order to send a full 1,000 amps through a kWh meter, it would need to be so beefy as to be impractical. A CT with an out put of 0-5 amps can be used with a ratio proportional to the Primary current (1,000 amps) by the Secondary current (5 amps) in this case the ratio would be 200/1.
The meter would only need to handle 5 amps in order to represent 1,000 amps.
BTW,
IF YOU ARE UNFAMILIAR WITH CTs DONT PLAY WITH THEM. IT IS POSSIBLE THAT THEY WILL EXPLODE OR PRESENT EXTREMELY HIGH VOLTAGES IF YOU DON'T HAVE A COMPLETE CIRCUIT (METER CONNECTION, OR JUMPER WIRE) ON THE SECONDARY SIDE.
[This message has been edited by Redsy (edited 07-02-2002).]
