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NORA Oilheat Technicians Manual

The lower the wire number, the bigger the wire and the more amps it can carry. Chapter 8 Basic Electricity opposite ends of both jumper wires to different screwdrivers, hold the handles of the screwdrivers and touch the blades to opposite terminals of the capacitor. Electric energy needs a pathway from the source and back to the source. If you do your job, this pathway is our electric circuit. Any wet object has enough minerals in the water to provide an alternate pathway. The human body is over 50% water, and when the skin is damp it will provide a good pathway back to the source if there is not an easier one. Never allow your body to be that pathway! Always consider all electrical components to be energized until you test and prove they are not. 8-22 Basic Electricity When you are working on electricity, remove all metal objects such as watches and jewelry from your hands and wrists. Until you are absolutely sure a circuit is shut off, only use one hand—keep the other in your pocket. This prevents the electric pathway from going from one hand to the other hand through your heart. Be sure to replace any damaged or frayed wires, protect wires from touching moving equipment, and keep them clear of walkways. Fire Every wire has resistance and converts some electrical energy into heat. When current flows, the wire warms up and keeps getting hotter until it reaches steady state where the heat it loses to its surroundings equals the heat being created. If there is too much current being drawn by the loads in a circuit, the steady state temperature of the Multimeter Testing Review Tips Voltmeter: Touch one lead from the meter to one side of the load or circuit to be tested and one to the other so the meter is parallel to what you are testing. This test is done on a live circuit. The reading is the difference in voltage from the spot where one lead is touching to the spot where the other is touching. Ammeter: Now, energize the circuit and the meter will tell you the amps traveling to that load or circuit. The clamp on ammeter is much easier and less intrusive to use. Close the clamp around the single wire you wish to test while the circuit is energized and it will tell you the amps flowing through that wire. The meter will read the amps through the wire cover, so this test need not be done on bare wire. Ohmmeter: Disconnect the hot and neutral wires from the power source and discharge any capacitors that may be in the circuit to be tested. The ohmmeter supplies its own power. Touch the leads from the meter to the wires you have disconnected from the power source and the meter will show the resistance of that circuit or load.


NORA Oilheat Technicians Manual
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