Switch off power, wear proper protective clothing, safety shoes, Notice board : Do not switch on – Men at work, stand on rubber mat, remove metal rings, watch bracelets, use proper insulated tools, check power supply with voltmeter and double check the voltmeter with known power supply, keep one person stand-by with proper safety gears, inform authority and get proper work permit. In case of electrical shock, give proper first aid, check heart beat and pulse.