Figure 3.10. Racking of a circuit breaker cont'd

hole (21 in the guide rod (3). This prevents the closing

WARNING

springs (4) from releasing their energy to close the

When circuit breakers are being inspected, operated

breaker contacts. Complete the last clock- wise or

slowly or maintenance work is being done the breaker

fourth stroke.

Following the inspection period or

must be in the open position as the closing springs are

maintenance, the closing springs must be recharged

being restrained by the safety pin. The procedure for in-

with the closing handle. Complete 31/2 complete cycles

serting and removal of the safety pin is given below in

as before and before the fourth counterclockwise stroke

remove the safety pin from the guide rod and place in

the retaining spring clip adjacent to the guide rod.

c. To restrain closing springs operate the

Complete the last clock- wise stroke and the breaker will

charging (closing) handle (5, fig. 3-11) 31h complete

close. The breaker must be tripped to open before it

cycles. At the end of the fourth counterclockwise stroke

can be pushed into its compartment.

and before performing the fourth clockwise stroke insert

the safety pin (1) into

3-18