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Figure 5-12. Heater and light circuit and connection diagram
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TM-5-6120-250-34 Substation Trailer Mounted 500 KVA AC 4160-416Y/240V 208Y/120V 3 Phase 50/60 Hertz Avionics Model 950-2200A Manual
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CHAPTER 7 REPAIR OF SEMI- TRAILER
CHAPTER 6
REPAIR OF CABLE
a. Grounded  Conductor.
In  checking  for  a
grounded conductor, the test is made between each
6-1. General
conductor and ground while the far end of the cable is
When a cable fault occurs, one or a combination of the
open.
following conditions may be found to exist: (1) One or
more of the conductors may be grounded, (2) there may
b. Short Circuit.  In checking for a short circuit
be a short circuit between two or more conductors, (3) the
between conductors, the test is made between each of the
cable may be open circuited. Faults in exposed cable,
possible combinations of conductors An  ground or by
joints, connections or equipment can usually be found by
testing each conductor with the o per conductors of the
visual inspection. Any source of dc potential connected to
cable ground.
the cable terminal through a voltmeter or a volt dc meter
resistance can be used to determine the type of fault. A
c.  Open Circuit. The continuity of the conductors is
portable testing set megger of appropriate voltage! should
determined by tying the conductors together temporarily
be used to test isolated sections of cable after the ends
at the far end and then testing between each conductor
have  been  disconnected  from  feeders,  buses  or
and ground.
If the conductors are continuous, the
equipment.
voltmeter reads full voltage, the meter reads full voltage'
or the meager reads zero.
6-2. Test
6-1

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