*Not applicable, because these are thermosetting materials
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AC switches Single pole Double pole 3 way to 3 way 3 way 4 way
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Hot System ground Hot
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Single pole Double pole
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Blank Black screw
Blank Black screw Black screw Hot System ground Hot
Pilot light switch Red handle glows when switch is on
Line Neutral Load
Glow handle switch Handle glows when switch is off
Momentary & Maintained contact switches
Hot System ground Hot
Double pole, double Throw switch
Neutral 120 277
Neutral 120 277 250 or 277 V AC
125 V Hot System ground Hot
FIGURE 2-7 Wiring diagrams for switches in various systems
FIGURE 2-8 Grounding systems used by connecting various plugs to a circuit
In some troubleshooting situations, the electrician will be called upon to trace wires Most multi-wire cables have color-coded conductors Follow the color code to identify the same conductor at each end of the installation When installing a wiring system, make a list of the color-coded conductors and where each terminates This makes future troubleshooting easier Test for wire pairs using an ohmmeter Short two wires together on one location and use an ohmmeter at the other end to test for continuity Then mark with colored tape or a number label
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Troubleshooting Electric Motors
Electric motors should be installed and maintained by electricians There are millions of motors in use in homes, of ces, stores, and industrial plants One major concern is choosing the right motor for a given job The choice depends on The intended use of the motor The availability of power The location Other factors
Once installed, the motor must be properly maintained to prevent problems The electrician and apprentice should ensure proper motor maintenance, and if problems do occur, they should be able to pinpoint the source and cause of the problem and correct it This chapter discusses preventive maintenance of electric motors and danger signals to recognize in motors, and hints for correcting common problems
Small motors usually operate with so little trouble that they are apt to be neglected However, they should be thoroughly inspected twice a year to detect wear and to remove any conditions that
might lead to further wear or cause trouble Special care should be taken to inspect motor bearings, cutouts, and other parts subject to wear Also, be sure that dirt and dust are not interfering with ventilation or clogging moving parts
CHECKING AND MAINTAINING SMALL MOTORS
Be sure there is adequate wiring After a motor has been installed or transferred from one location to another, check the wiring Be sure that adequate wire sizes are used to feed electric power to the motor; in many cases, replacing wires is all that is needed to prevent future breakdowns Adequate wiring also helps to prevent overheating and reduces electric power costs Check internal switches Although switches usually give little trouble, regular attention will make them last longer Use ne sandpaper to clean contacts Be sure sliding members on a shaft move freely, and check for loose screws Check load conditions Check the driven load regularly Sometimes additional friction develops gradually within a machine and after a period imposes an overload on the motor Watch motor temperatures and protect motors with properly rated fuses or overload cutouts Provide extra care in lubrication Motors should be lubricated according to manufacturer s recommendations A motor running three times more than usual needs three times more attention to lubrication Provide enough oil, but don t overdo it
Keep commutators clean Do not allow a commutator to become covered with dust or oil Wipe it occasionally with a clean, dry cloth or one moistened with a solvent that does not leave a lm If it is necessary to use sandpaper to clean the commutator, use No 0000 or ner Replace worn brushes Inspect brushes at regular intervals Whenever a brush is removed for inspection, be sure to replace it in the same axial position that is, it should not be turned around in the brush holder when it is put back in the
TROUBLESHOOTING ELECTRIC MOTORS
motor If the contact surface that has been worn in to t the commutator is not replaced in the same position, excessive sparking and loss of power will result Brushes naturally wear down They should be replaced before they are less than 1/4 inch long Be sure that the motor has a proper service rating Whenever a motor is operated under different conditions or used in a different way, be sure it is rated properly Take, for example, a motor rated for intermittent duty because the temperature rise within the motor will not be excessive when it is operated for a short period Putting such a motor on continuous duty will result in excessive temperature increases that will lead to burnout or at least to deterioration of the insulation