Product Manual

5. Transfer Switch Service 3-2016

5.3.3 Transfer Switch Replacement

CAUTION

Carefully follow all hardware torque requirements to avoid damage to parts.

1. RA 100A/200A transfer switch replacement only:

a. Install the busbars on the new switch in accordance with the markings. Make sure that the long

end of the busbar is connected to the breaker.

b. Use the hardware that was previously removed to install the new switch in the cabinet. Torque

the M6 nuts to 50 in-lbs (5.6 Nm) and torque the 1/2-20 screws to 80 in-lbs (9 Nm).

c. Use the hardware that was previously removed to install the bracket at the load and emergency

side of the switch. Torque the M6 nuts to 50 in lbs (5.6 Nm).

d. Tighten the 1/4-20 bolts securing the mechanical lugs. Torque the bolts to 80 in-lbs (9 Nm).

e. Reinstall the cabinet door panel(s).

2. RA 400A transfer switch replacement only:

a. Use the hardware that was previously removed to install the new switch in the cabinet. Torque

the three M8 bolts to 168 in-lbs (19 Nm).

b. Service entrance models only: Install the busbars on the new switch in accordance with the

markings:

i. Make sure to secure the busbars and two terminal rings in the proper location and

orientation. Torque four M6 bolts to 124 in-lbs (14 Nm).

ii. Secure the busbars to the breaker. Torque two 3/8-16 bolts to 159 in-lbs (18 Nm).

c. Non-service entrance models only: Install mechanical lugs and two terminal rings on the new

switch in accordance with the markings. Torque four M6 bolts to 124 in-lbs (14 Nm).

d. Install two lugs to the emergency side of the switch. Torque four M6 bolts to 124 in-lbs (14

Nm).

e. Install two lugs to the load side of the switch. Torque four M6 bolts to 124 in-lbs (14 Nm).

f. Reinstall the cabinet door panel(s). Take care to properly align the bolts to avoid cross-

threading:

i. Service entrance models only: Torque six M6 bolts to 48.7 in-lbs (5.5 Nm).

ii. Non-service entrance models only: Torque eight M6 bolts to 79.7 in-lbs (9.0 Nm).

5.3.4 Reconnect AC Power (When Finished)

1. Connect the generator set starting battery (negative (-) battery cable last).

WARNING

If the cabinet must be opened for any reason, remove AC power to the automatic transfer

switch. If the instructions require otherwise, use extreme caution due to the danger of

shock hazard.

2. If there is an external battery charger, connect the battery charger to its AC power source.