Installing the Phase Sensors
AK-50 & AKS-50 Breakers
Figure 18 shows the parts provided for assembly of the CT on each pole.
1.Mount the new copper CT post to the back frame with the two 38-16 x 112" bolts, flat washers, and lock washers provided, as shown in Figure 19.
2.Fasten the three small insulated wire fasteners to the back frame with the 14-20 x 134" screws provided, as shown in Figure 20. One fastener is mounted under each CT.
3.Place a CT over each copper post, first applying a small amount of RTV or similar adhesive to prevent the CTs from rotating.
4.Mount the top copper bus over each CT and secure with the 12-13 x 112" Allen-head bolts, lock washers, and flat washers provided.
5.Insert two 38-16 x 112" bolts, lock washers, and flat washers through each top copper bus into the contact arm assembly.
6.Tighten the 38-16 bolts to 200 in-lb and the 12- 13 bolts to 300 in-lb.
WARNING: Step 6 ensures critical electrical integrity connections. The designated bolts must be correctly tightened for proper operation. Failure to tighten these bolts properly will cause a breaker failure, resulting in property damage and/or personal injury.
Figure 18. Parts provided for CT installation for one pole.
Figure 19. CT post mounted in the breaker back frame.
Top Copper
Bus
1
Bolt
3
|
| Wire |
Wire |
| |
Harness |
| Fastener |
Figure 20. CT installation completed..
13
