Cutler-Hammer Busway Systems - Eaton Canada

Cutler-Hammer
Plug-in Protective Devices
All Pow-R-Way and Pow-R-Way II plugin
units (both circuit breaker and fusible
types) have the following features:
Personnel Safety (See Fig. 1)
Plug-in units have a dual purpose interlock
to prevent cover from being opened while
the device is in the “ON” position and to
prevent accidental closing of the device
while cover is open. This dual purpose
interlock may be defeated if necessary for
maintenance.
The plug-in unit and the busway are
interlocked to ensure that the device is in
the “OFF” position prior to installation or
removal from the unit (Fig. 2).
The plug-in enclosure is grounded to the
busway housing before the phase and
neutral stabs make contact with the busway
bus bars.
The operating handle remains in control
of the disconnect device at all times.
All plug-in units are polarized to make it
impossible to put plugs on backwards and
have neutral stab touch a phase bar.
The clamp and guide are designed to
allow plug-in units to be hung in place on
horizontal runs prior to insertion of stabs.
Flexibility (See Fig. 3)
Two-position handle location allows
handle to be mounted on the end of the
unit for horizontal runs or on the side of
the unit for vertical runs.
Neutral stab and ground stab are field
mountable.
Backfeeding is an industry-acknowledged
practice whereby incoming power is fed
into the load side of a plug-in unit to feed
a busway run. UL permits “backfeeding”
a circuit breaker, providing it has a noninterchangeable
trip or is a Seltronic-type
breaker.
UL will not permit “backfeeding” a
TRI-PAC ® type circuit breaker or a fusible
plug-in device.
Using Cutler-Hammer Series C circuit
breaker bus plugs, system interrupting
ratings can be increased up to 100K AIC
(480V) or 200K AIC (240V) when F-(150A),
J-(250A), or K-(400A) frames are used. By
changing out the breaker only and leaving
the enclosure intact, this allows for
flexibility to deal with system short circuit
availability changes (up to the rating of
the busway), as well as downstream protection
through series ratings.
March 2001
Dual Purpose
Interlock
Neutral
Stab
Ground
Stab
Fig. 1. Open View Plug-in Units
Interlock
(Accessible)
Fig. 2. Plug-in Unit Mounted on Busway
Handle Mounted for
Horizontal Run
Fig. 3. Universal Handle Mounting
Application Data
30-560
Page 23
Pow-R-Way ® Busway Systems
Interlock Defeater
Interlock
(Not Accessible)
Handle Mounted
for Vertical Run
Load End