Patent ID: 7859246

Claim:
A modular energy meter, comprising a power line access module, comprising a phase line access portion having an input end and an output end; and a zero line access portion having an input end and an output end; and at least one modular energy metering device each having a phase line input end, a zero line input end, and a phase line output end; wherein said input end of said phase line access portion is connected to a phase line of a power line; said input end of said zero line access portion is connected to a zero line of said power line; said modular energy metering device operates to measure energy values output from a phase line output end and a zero line output end of said power line; said output end of said phase line access portion is connected to said phase line input end of said modular energy metering device; said phase line output end of said modular energy metering device is connected to a phase line output line; said output end of said zero line access portion is connected to a zero line input line; and the number of said zero line output lines and said phase line output lines corresponds to that of said modular energy metering devices.