POWER LINE COMMUNICATION SYSTEM AND WATT-HOUR METER USED FOR THIS

PROBLEM TO BE SOLVED: To make it possible to adopt both a remote meter reading system and a home system using a lower-side frequency band on a common power line.SOLUTION: A power line communication system 1 comprises: a first power line modem 10A connected with a low-voltage distribution line 2 near a transformer 3; second power line modems 10B, 10Bconnected with the low-voltage distribution line 2 via a power distribution panel 4; a watt-hour meter 11; a third power line modem 10C for performing power line communication with the first power line modem 10A; a fourth power line modem 10D for performing power line communication with the second power line modems 10B, 10B; a bypass capacitor 13a provided between a connection point of the power line modem 10C on the low-voltage distribution line 2 and a connection point of the communication modem 10D, and connecting a grounding wire 2b of the low-voltage distribution line 2 and a first non-grounding wire 2a; and a bypass capacitor 13b provided between the power line modem 10C and the communication modem 10D, and connecting the grounding wire 2b of the low-voltage distribution line 2 and a second non-grounding wire 2c.