LOAD SWITCH ELECTRONIC TYPE THREE PHASE ACTIVE ELECTRIC ENERGY METER MEDIUM VOLTAGE SWITCH CABINET ELECTRONIC TYPE SINGLE-PHASE ELECTRIC ENERGY METER ELECTRONIC TYPE THREE PHASE PREPAYMENT ELECTRIC ENERGY METER FIREPROOF ELECTRICAL PRODUCTS INDUCTION SWITCH COMPUTER LAN SOCKET LARGE BOARD TWO-POSITION SWITCH LARGE-BOARD ONE-POSITION SWITCH LARGE-BOARD THREE-POSITION SWITCH TRANSFORMER ANTI-EXPLOSION FIREPROOF FIRE EXTINGUISHING SYST SULFUR HEXAFLUORIDE RING CABINET THREE PHASE FOUR LINE ELECTRIC ENERGY METER FULL ELECTRONIC PREPAID ELECTRIC ENERGY METER ELECTRONIC FORMULA SINGLE-PHASE TIME-SHARING PREPAID ELECTRI CONCENTRATED DATA LOGGING ELECTRICITY CONSUMPTION MONITORING ELECTRIC POWER MARKET AUTOMATION SYSTEM POWER TRANSMISSION LINE PATROLLING MANAGEMENT SYSTEM