UFC 3-560-01
6 December 2006
Including change 1, 7 December 2006
9-7
METALCLAD SWITCHGEAR.
9-7.1
Operate and maintain metalclad switchgear according to manufacturer's
instructions and the guidance provided in this section.
9-7.2
Perform the following prior to drawout (rack out) of a circuit breaker operating
mechanism. Always rack out the switchgear breaker whenever there is work on the
circuit originating from that switchgear breaker.
9-7.2.1 In a confined space, including pier vaults, the switchgear must be
deenergized. Ground where possible. In other applications, deenergize the switchgear
whenever possible, Utilize remote tracking devices (robots) when available, to rack
breakers in and out. Wear appropriate PPE in accordance with Chapter 4.
9-7.2.2
Open the circuit breaker.
9-7.2.3
Discharge the stored-energy mechanism, if provided.
9-7.2.4 Check that protective interlocks are functioning to protect against closed-
position circuit breaker rack out.
9-7.2.5
Ensure that all workers in the vicinity know the circuit breaker is being racked
out.
9-7.3
Access to switchgear terminals through portholes for maintenance in circuit
breaker cells is limited to the following.
When both sets of terminals in a cell are deenergized (i.e., line and load,
or bus to bus).
After both sets of terminals are deenergized, access to switchgear
terminals through the portholes is permitted for cleaning, inspecting, and
routine maintenance of terminals and bushings.
Note: Paragraph 9-7.4 (including 9-7.4.1 through 9-7.4.4) do not apply to Navy
personnel.
9-7.4
A manufacturer-approved ground and test device can be used for access to
terminals for procedures such as the application of protective grounds, phase
identification on deenergized circuits, or phasing tests on live circuits. Use of this
device avoids the hazardous operation of opening and shutting the shutters of a high-
voltage switchgear cell. It can be an extremely hazardous device if not used according
to manufacturer's instructions.
9-7.4.1 Do not install the device with ground cables already connected. Connect
ground cables after installing the device.
9-11
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