Siemens NXAIR Operating Instructions Manual page 375

To uncover the bushing contacts (2) to be earthed, open the shutter either to the busbar
compartment (1) or to the connection compartment (3) as described in chapter 22 "Operating
the shutters".
Fig. 679: Shutter to the busbar compartment
Earthing the bushing contacts
Hereafter, it is exemplarily shown how to attach the earthing device to the bushing contacts in the upper row
of bushings linked with the busbar compartment. Proceed in the same way when attaching the earthing
device to the bushing contacts in the lower row of bushings linked with the connection compartment.
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open (as example)
DANGER
Electric shock
Perform the following activities in the presence of an observer until the
earthing device is completely mounted to all three bushing contacts. In
case of emergency, this person can call for help.
Exclusively use the associated earthing rod for attaching the earthing
tulips to the bushing contacts.
Use the earthing device accessories only in the way described hereafter.
Never reach out beyond the limiting ring on the earthing rod. This ensures
a safe distance to the bushing contacts.
INFORMATION
Unexptected light and noise
After isolation, the busbar system still carries some capacitive charging.
Expect short light and noise from a minor electrostatic discharge while
leading the earthing rod with the earthing tulip on top towards the bushing
contact.
NXAIR / ≤ 40 kA
Fitting the earthing device
1
(1) Shutter to busbar compartment
(2) Bushing contacts uncovered
) Shutter to connection compartment
(3
2
3
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