17
Instruction Book
IB182221EN September 2017 www.eaton.com
GE AM [Cable or Hard Bus Application]
Ground and Test Device
SECTION 4: DESCRIPTION AND OPERATION
The G&T is a draw out device that can be inserted into a circuit
breaker compartment in the same manner as the GE AM Air Circuit
Breaker and Vacuum Replacement Circuit Breaker. It can be ordered
as a single terminal device or a double terminal Ground and Test
Device. It may also be ordered as a cable or hard bus type. Each
terminal is isolated from each other and the ground bus connections
by insulating barriers. The upper and lower terminals are accessible
upon opening the respective front hinged door. The ground
connection is located in the lower section of the device.
WARNING
IT IS CRITICAL THAT THE BUS OR LINE TERMINALS BE CORRECTLY
IDENTIFIED FOR EACH CIRCUIT BREAKER COMPARTMENT BEFORE USING
THIS DEVICE.
Type GE AM-13.8 manual Ground & Test devices are also available
with either the upper or lower terminals only.
4.1 INSULATING BARRIERS
Insulating barriers are red pieces of GPO-3 glastic material used
to isolate the primary terminals from each other and the ground
connections. They are attached to the Ground and Test Device frame
using insulated hardware. Using other hardware than those provided
will affect the insulating integrity of the Ground and Test Device.
4.2 BUSHINGS AND DISCONNECTING CONTACT
ASSEMBLIES
The line and load bushing assemblies, which are the primary circuit
terminals of the Ground and Test Device, consist of six silver
plated conductors. Solid Stab type primary disconnecting contacts
at the ends of the conductors provide means for connecting and
disconnecting the G&T device to the bus terminals in the swtichgear
circuit breaker compartment.
4.3 INTERLOCKS
The only interlocks associated with these Ground and Test Devices
are the Kirk
®
Key interlocks located on the front of the device.
(Figure Set 3.3) This protects the user from having both top and
bottom hinged doors open at the same time. While either the top or
bottom door is unlocked, the key is unable to be removed from the
lock. To remove the key, close the appropriate door and turn the key.
This will lock the door and the key will now be able to be removed
and inserted into the other lock. This feature is not applicable for
single terminal G&T devices.
NOTICE
ONLY ONE KEY WILL BE PROVIDED WITH EACH GROUND AND TEST
DEVICE. THIS PREVENTS THE INTERLOCKING MECHANISM FROM BEING
BYPASSED. IF A KEY IS LOST, CONTACT EATON FOR A REPLACEMENT.
THIS FEATURE IS NOT APPLICABLE FOR SINGLE TERMINAL GROUND AND
TEST.
DANGER
INTERLOCKS ARE PROTECTIVE DEVICES FOR PERSONNEL AND
EQUIPMENT. DO NOT BYPASS, MODIFY, OR MAKE INOPERABLE ANY
INTERLOCKS. DOING SO COULD CAUSE DEATH, SERIOUS PERSONNEL
INJURY, AND / OR PROPERTY DAMAGE.
4.4 GROUNDING CONTACTS
The grounding contact is a solid bus, which grounds the device by
engaging the switchgear circuit breaker compartment grounding
bus when the G&T device is lifted into the “connect” position. The
ground contact is located at the rear of the device, on the truck, and
visible from the back of the device when out of the circuit breaker
compartment. (Figure Set 3.3).
