Warning – GE Industrial Solutions Arc Vault Protection System User Manual

Page 21

DEH-41483 Rev. 3

Arc Vault™ Protection System

Description

Figure 3-9 Racking handle for movement of Arc Vault

1. Arc Vault device position indicator

Movement of the Arc Vault between the CONNECTED, TEST,

and DISCONNECTED positions is performed by the use of a

racking handle, see Figure 3-9, which engages the racking

mechanism mounted on the cassette. An optional remote

racking device is also available. Movement to the

WITHDRAWN position is manually performed after opening

the compartment door. These positions are illustrated and

described more fully in SECTION 5 .

WARNING

The door should NOT be opened when the Arc Vault is

charged and in the CONNECTED position. Although

the device compartment door may be opened in any

position, it is recommended that the door only be

opened when the Arc Vault is in the DISCONNECTED

or WITHDRAWN position.

On a 480V nominal system the Arc Vault Protection System

can be applied on systems with available current up to

65KA.

Feeder Cable Compartment

The rear cable and terminal compartment, Figure 3-10,

provides for cable installation and terminations. The cable

bending space meets the requirements of the National

Electric Code. Various arrangements of single or double

cable terminals are provided, depending upon the

purchaser's requirements.

When specified, racks for the support of feeder cables are

located in the cable compartment. The actual support of

the cables is provided by lashing them to these racks.

Also located in the cable compartments are provisions for

terminating control wires between external devices and

control circuits within the switchgear equipment.

Figure 3-10 Cable termination provisions

Cable lugs - mechanical type

When furnished, the terminal boards, for such connections

are located in an enclosed vertical wiring trough mounted

on the side of the cable compartment. The trough is of steel

construction with bolted covers to provide an isolation

barrier between the control wiring and the adjacent power

cables.

GROUND BUS

All General Electric AKD-20 switchgear sections are

grounded to the internal equipment ground bus (4), Figure

3-11, located at the bottom of the cable compartment.