Temporary Master Meter Installations
These are some simple steps that could have been taken when removing temporary Master Metering Equipment.
1. Do not route the duct through an energized compartment. Ducting can be ran straight out of the CT compartment or embedded into the floor. If you must route it through a compartment, do so after the main switch so that it can be isolated by locking out the main switch.
2. Per the BC Hydro "Requirements For Secondary Revenue Metering Installations (750 Volts or Less)" guide, use a single continuous piece of rigid PVC (not ENT) if the conduit must pass through other switchgear compartments.
3. Coordinate an isolation on the service with BC Hydro so the work can be done cold.
4. Use appropriate cover up and/or "Hot" working procedures should the work still be done with the bus bars energized.
5. While BC Hydro requires the meter cabinet, test block, CT's and PT's to be removed and returned, BC Hydro does not require the conduit to be removed. Therefore, if the temp master meter is to be completely removed (not converted to a rebate meter), the electrician can simply cut and cap the conduit at the top of the switchgear after it has exited the compartment.
6. Eliminate the temp master meter completely and have the unit/suite metering ready to be installed at energization of the main switch.
The BC Hydro preferences are to completely remove the hazard by not having the conduit in the switchgear or having temp master metering. If these options are not viable, then ensuring the work can be done "cold" should be the next choice (this includes cutting and capping the conduit). Finally, only if no other options are viable, should the electrician undertake the work while the switchgear cabinet is still energized.
Z462-08 (CSA Workplace Electrical Safety) practices and standards must be applied.