TROUBLESHOOTING ELECTRIC MOTORS SAFETY PRECAUTIONS in .NET

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TROUBLESHOOTING ELECTRIC MOTORS SAFETY PRECAUTIONS
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When working with motors, it is important that certain safety procedures be followed at all times
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Be sure that all motor installation, maintenance, and repair work is performed only by quali ed people Disconnect and lock all input power before doing any work on motors or any electrical equipment Whenever equipment is to be lifted, follow the speci c procedures for using the lift bail Follow the National Electrical Code (NEC) rules and all local codes when installing any electrical equipment Be sure that all equipment is properly grounded in accordance with the NEC
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Keep hands, hair, clothing, and tools away from all moving parts when operating or repairing equipment Provide proper safeguards to prevent contact with rotating parts Be familiar with and adhere to recommendations outlined in Safety Standards for Construction and Guide for Selection, Installation and Use of Electric Motors and Generators (NEMA MG-2) WARNING: WHEN USING LIFT BAIL Do not use the lift bail on the motor to lift the motor along with additional equipment, such as
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Pumps Compressors Other driven machinery In the case of assemblies on a common base, do not lift the motor by the lift bail, but rather use a sling around the base or the lifting means provided on the base In all cases, take care to ensure lifting only in the direction intended in the design of the lifting means Also, be careful to avoid hazardous overloads due to deceleration, acceleration, or shock forces
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Alarm Systems
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There are many speci c functions and jobs with which an electrician and apprentice should be familiar It is impossible in a book such as this to explain and discuss all of them We, however, discuss the major topics that include most of the tasks an electrician may be called on to do These are 1 2 3 4 5 6 7 Installation and repair (if necessary) Alarm systems Lighting systems Motors Power systems Programmable controllers General wiring systems
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There are a number of different types of alarm systems Some are hand-wired, with wires running from switches to a central location where a relay is energized or de-energized to cause an alarm to be sounded However, some types of alarm systems require less wiring They rely on electronics for sensing and sending signals to central units They may be digitized, with programmed codes that disable the system temporarily to allow entry into the premises and to allow zone changes from time to time
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CHAPTER FOUR
A TYPICAL HARD-WIRED SYSTEM
In a typical hard-wired system, re and security systems are wired together Figure 4-1 shows the wiring diagram of a house with such a system A detailed diagram of the wiring for the security or re system is given in Figure 4-2 Notice the closed-loop intruderdetection circuit and how the switches work Then examine the re detection circuit and how it is wired into the system Except for the 120-volt line to the power supply, the rest of the wiring is low voltage
FIGURE 4-1 A typical hard-wired system with fire and security systems wired together (NuTone)
To intercom master 18/2 Use with S-135 only
Inside S-160 Bell or, alarm S-134 or S-135 horn Use a maximum of 2 alarms
S-160 Outside alarm 18/2 Outside wire: Run in Condult or, use weatherproof cable
Alarm off: No voltage Alarm on: 120 V 60 Hz supply, 15 Vdc Battery supply, 11 Vdc + S-154 Black 120 V, 60 Hz white 1 Green Screw 2 3 4 6 5
No 18/2 NuTone S-141
Earth ground
120 V, 60 Hz S-120 (135 F) Heat detector or S-121 (200 F) 10 K Circuit sentry Blue Orange supplied with S-154 must be connected across end of fire detection circuit Fire Detection Circuit Any number of S-110 s, S-120 s, S-121 s and S-129 s can be connected across fire detection circuit S-120 or S-121 S-129 Any number of S-112 s, and/or S-117 s can be connected in intruder detection circuit Closed loop Intruder Detection Circuit S-113 Inside shunt switch 18 Ga NuTone S-142 18 Ga Magnetic switch S-117 Magnet Plunger Magnet Magnet Bypassed S-112 Bypassed S-117 S-117 18 Ga switch
Manually operated switch S-110
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