3) Adjustment
If wipe and gap adjustments are deemed to
be necessary in the field for breakers using
45A, 46A, 47A, 48A & 49A interrupters, the
following parameters should be used:
• Wipe:
.156 inches minimum
• Gap:
.375-.425 inches
If the wipe is less than .109, adjustment is
required.
If wipe and gap adjustments are deemed to
be necessary in the field for breakers using
68A interrupters, the following parameters
should be used:
• Wipe:
.155 inches minimum
• Gap:
.450-.550 inches
If the wipe is less than .100, adjustment is
required.
a. Determine the amount of adjustment
required to bring both the wipe and
gap within requirements.
b. Close the ground and test device and
block the trip latch against the frame
using the 3/8-16 bolt in the trip latch
blocking hole.
c. Loosen but do not remove the ¼” socket
head cap screws (Figure 7, c) holding
the coupling clamp (Figure 7, b). Be
sure that the clamp can be rotated
freely by hand.
d. Hold the hexagon projection at the
bottom of the operating rod (1 1/8”
wrench) and loosen the adjacent lock
nut (Figure 7, h) (15/16” wrench).
e. Decrease the wipe (and increase the
gap a like amount by turning the
operating rod down (clockwise looking
from the top) or increase the wipe
(while decreasing the gap) by turning
the operating rod up (counterclockwise
looking from the top).
Note:
The operating rod has 11 threads
per inch so that
1
/
6
turn (one flat) of
the operating rod hex will result in
approximately .015” change in wipe
and gap.
f. After completing the adjustment,
torque the operating rod locknut
(Figure 7, h), to 40-50 ft-lbs while
preventing the Operating Rod from
turning. Tighten the coupling clamp
screws to 10-12 ft-lbs.
g. Remove the trip latch blocking bolt and
trip the ground and test device open.
Recheck the wipe and gap and readjust
if necessary.
h. If both wipe and gap cannot be brought
into the required settings, check the
pull rod adjustment and the trip latch
clearance. Increase the trip latch
clearance to decrease the sum of the
wipe and gap or decrease the trip latch
clearance to increase the sum of the
wipe and gap.
Note:
Do not exceed the specified range of
settings on the trip latch.
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20
Mechanical Checks and Adjustments
Power/Vac® Electrical Ground and Test Devices
Equipped with ML-17 Mechansim
01.4IB.50100
