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Figure 4-1. Lamp holder (60 watt 115V).
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TM-5-6120-250-12 Substation Trailer Mounted 500 KVA AC 4160-416Y/240V 208Y/120V 3 Phase 50/60 Hertz Manual
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Figure 4-2. Removal of removable links.
(2) Check that all ground connections are
WARNING
made and connections tight.
Do not remove cover while  the
(3) A check may be made using the voltmeter
instruments are energized. Scale
and selector switch to make sure the low voltage section
plate,
pointer
and
element
is de-energized.
assembly may be at hazardous
voltage levels.
b. To Disconnect Removable Bus Links (fig. 42).
4-21. Meter Replacement (Voltmeter and Ammeter)
(1) Open
right rear door
of low
voltage
a. To replace meter remove the connecting wires
cabinet.
from the back (2 wires on the voltmeters, 3 on the
(2) Approximately in the middle is the rear of
ammeter, one connection has two wires on it).  Tag
the main breaker.  Each of the three output studs is
each  wire  when  disconnected  to  insure  correct
connected by double bars (space apart) to two cable
installation.
clamps and by two "L" shaped bars (spaced apart) to a
b. Remove the four screws and nuts mounting the
feeder bus. These "L" shaped bars are the removable
meter to the panel.
links. (8, fig 2-3).
c. Replace new meter in reverse order.
(3) Loosen and remove the 5/8-11 x 13/4
long bolt (1, fig. 4-2), nut (2) and two washers (3) on the
bottom (the long leg) of the removable link. This is the
4-22. Switch Replacement {Voltmeter and Ammeter
connection to the bus (4).
Selector Switches)
(4) Loosen and remove the 5/8-11 x 2 long
Remove the voltmeter selector or ammeter selector 's4
bolt (5), nut 1((1 and two washers (7 ) at the top (the
itches.
short leg) of the removable link (8 and 9). This is the
connection to the main breaker output stud.
a. Remove the wires from the contacts of the
(5) Remove the two "L" shaped links (8 and
switch.  Tag each wire when disconnected to insure
9() from between the output stud connecting bars. Note
correct installation.
that  one  "L"  shaped  link  (9)  has  shorter  legs
b. Remove the three screws on the front, remove
(approximately the thickness of a bar).
switch from panel.
c. Replace in reverse order, and connect wires, put
(6) The bolts, nuts, washers and legs should
cover on
be reassembled to keep links paired and for safe
keeping of the hardward.
WARNING
(7) Repeat paragraphs 3, 4, 5 and 6 for each
The  low  voltage  distribution
of the two remaining sets of links. It should be noted
cabinet  must  be  de-energized
that each pair or set of links are different in length
before attempting to disconnect
because the feeder bases are at different heights.
the bus removable links. Serious
personal injury and/or damage to
(8) The removable bus links should be
equipment may result.
assembled as pairs or sets as in paragraph (6) and
stowed in one of the storage cabinets when not
4-23. Bus Link Removal
connected.
a. Perform the Safety Precautions
(1) Visually check that load break switch is
open.
4-7

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