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MAST SAFE WORK PROCEDURE Job Name: Facility: Using Electrical Meters (TecVoc) Tec Voc High School Analysis By: General Notes: Make sure that you have been trained on the proper use of meters before you attempt to use one. This analysis is not meant to replace a course on meter usage. Always keep in mind that power can have more than one source and capacitors can store large amounts of voltage. Hold the test leads as far back from the metal tips as possible and never test while you're wet or in water. Personal Protective Equipment Safety glasses, rubber gloves if hands are wet or damp, meters and test leads which are in good condition. Hazards Present Meter could blow an internal fuse or be damaged beyond repair depending on how high the voltage was. Meter could be damaged or test leads could be ruined and internal fuse could be blow. Fire or injury could result. Meter could explode causing injury or blindness. Chance of electrocution if voltage got past the leads to your body. The meter could clamp onto a bare wire or insulation or be pinched off to cause a short circuit and flash. Flash could have severe results, such as fire or injury, including death. Meter could explode causing injury. Power could travel from the meter to cause electric shock, burn or death. Electric shock, burn or death Electric shock, burn or death Safe Work Procedure 1 Using a multimeter to check resistance of a wire or device Wear safety glasses. Meter has a built in power source which it uses for checking for resistance. Always be certain to check only dead circuits. Capacitor warning. 2 Using a multimeter to check amperage Wear safety glasses. Multimeters have a pair of connectors that are designed to allow up to ten amps to flow safely through the meter in a series connection with the load. The load must not exceed the voltage or amperage limits of the meter. Page 1 3 Using a multimeter for testing A.C. or D.C. voltage. The display will indicate which type of voltage you are touching with the leads. Wear safety glasses. The switch position must be set for the highest scale possible and then moved down to suit, if the voltage is unknown to avoid a flash. If possible, use only one hand to hold the test lead and have the other lead clamped or pinned to the other side of po---tential power or ground. This will prevent the chance of stray power flowing through your heart. 4 Using a clamp-on ammeter to check amps Wear safety glasses. A clamp on meter is usually applied around a cable. When wiggling a cable to clamp the meter, be aware that copper wire loses its grip in a connector after time and the cable could pull out and short circuit. Always use the highest scale and never use on a voltage or current that exceeds the meters safety ratings. 5 Using a pigtail voltmeter to check voltage Wear safety glasses. The meter doesn't have a setting but you should never exceed the meters safe rated voltage. The one hand method for testing is the safest. 6 Using a plug tester with polarity check The plug that you test will have the power turned on so you must determine that the unit is solid and secure. If the plug were to fall to pieces as you tested it, you could be hurt. 7 Using a neon voltage test light The neon test light is an extremely low cost method of checking for voltage, but it usually doesn't indicate the amount. END OF SAFE WORK PROCEDURE Page 2