gobigorgohome
Electrical
In UL 845 (Harmonized UL, ANCE and CSA LV MCC's Standars *US, Mexico & Canada*) states the following:
"5.3.1.2 In the United States, the supply rating of equipment that is marked to indicate it is suitable for use as service equipment, has provision for 2 watt-hour meters without provision for current transformers, and is provided with two main disconnects shall not be less than 50% of the sum of the continuous ampere range of the assembled meter positions. (See Annex G.) In Canada, this is not permitted."
In Canada if we required utility metering on a service greater than about 100 amps, we would install revenue class metering CT's and PT's. They would be suitable for 100% of the MCC load. We might add a second set of CT's and PT's if the customer / owner wanted metering for their own internal use. Can anyone familiar with the UL & NEC rules or utility connections experience shed some light on the meaning of the above paragraph?
Thanks from Canada.
"5.3.1.2 In the United States, the supply rating of equipment that is marked to indicate it is suitable for use as service equipment, has provision for 2 watt-hour meters without provision for current transformers, and is provided with two main disconnects shall not be less than 50% of the sum of the continuous ampere range of the assembled meter positions. (See Annex G.) In Canada, this is not permitted."
In Canada if we required utility metering on a service greater than about 100 amps, we would install revenue class metering CT's and PT's. They would be suitable for 100% of the MCC load. We might add a second set of CT's and PT's if the customer / owner wanted metering for their own internal use. Can anyone familiar with the UL & NEC rules or utility connections experience shed some light on the meaning of the above paragraph?
Thanks from Canada.
