GE Industrial Solutions GE Zenith Series DPB - Manual (Page 32)

24 Installation & Operation Manual, GE Series DPB Busway
March 25, 2013, Rev 0 GE Confidential
neutral neutral neutral neutral
neutral neutral neutral neutral
CAM OFF
neutral neutral neutral neutral
OFF
STEP 1 STEP 2 STEP 3
OFF
OFF
TOP VIEW
OFF
CAM ON
TOP VIEW
ON
Tap Off
Box
isolated ground connection (optional)
Tap Off
Box
Series DPB Busway Installation & Operation Manual
TAP OFF BOX MOUNTING
Busway Tap Off Boxes have cam-actuated connections to the busway system as shown in Figure 20. As a safety feature
the insertion of the Tap Off Box cannot be made into the busway system if the cam knob is in the ON position and the tap off
contacts are extended. In the same way a Tap Off Box cannot be removed from the busway system while it is in the ON
position. The contacts will not pass through the opening until fully retracted and the bus insulation will keep the contacts
from passing through the bus until they are fully disengaged and closed. As a further safety feature the contacts are spring
activated to the OFF position to ensure that they fully retract.
Insertion and phase control are part of the safety built into every Tap Off Box. A lip is designed into the busrail that will
not allow the Tap Off Box to be inserted backwards. The Tap Off Box is inserted to the busway as shown in Figure 21. The
ground connection will be made and the phasing will be aligned in step 3 when the Tap Off Box is fully seated against the
busrail, and hold-down screws are screwed in over top of the side channel lip. NOTE: Do not tighten the hold down screws
so that they penetrate the busrail. To enegize the Tap Off Box, slide the cam knob to the ON position engaging the Contacts
to the bus Phasing and Neutral bus bars. As a safety feature the ground connection is always made first.
Contacts
Figure 20 - Tap Off Box Connections
Figure 21 - Tap Off Box Mounting and Energizing
ON
STEP 4
HOLD DOWN SCREWS
CAM KNOB
Contacts
Cam Knob
Cam Knob
Contacts
Retracted
Contacts
Extended