37 MAINTENANCE OF ENERGY PLANTS FOR OTHERS; ELECTRICAL REPAIRS AND INSTALLATION OF CELL PHONE BOOSTER EQUIPMENT; CONSTRUCTION PLANNING, NAMELY PLANNING CONSTRUCTION OF ENERGY PLANTS; CUSTOM CONSTRUCTION AND BUILDING RENOVATION; INSTALLATION, REPAIR AND MAINTENANCE OF HEATING EQUIPMENT, VENTILATION EQUIPMENT, AIR-CONDITIONING EQUIPMENT, TELECOMMUNICATION EQUIPMENT, AND HIGH-VOLTAGE ELECTRICAL EQUIPMENT; INSTALLATION, MAINTENANCE, AND REPAIR OF FIRE AND BURGLAR ALARMS; MACHINERY MAINTENANCE AND REPAIR, NAMELY RELIABILITY CENTERED MAINTENANCE; INSTALLATION AND MAINTENANCE OF ELECTRIC AND GAS LINES PROVIDED TO UTILITIES SUCH AS ELECTRIC, GAS, TELEPHONE, CABLE AND WATER COMPANIES AS WELL AS INDUSTRIAL AND COMMERCIAL CUSTOMERS