Meter Replacement (Voltmeter and Ammeter)

(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