Siemens NXAIR M - 22 Fitting the Earthing Device; Design, Application and Inspection of the Earthing Accessories

139-2021.9 / 07 NXAIR M 193
Fitting the earthing device
22 Fitting the earthing device
HINT
Read and understand these instructions before attempting operating works.
22.1 Design, application and inspection of the earthing accessories
DANGER
Impermissibly high voltage and current
Inappropriate use of the earthing accessories will result in impermissibly high
voltage and current.
Use the earthing device exclusively for the maximum permissible short-
circuit current and the maximum permissible short-circuit duration.
Do not use the earthing device for short-circuit tests or purposes causing
similarly high voltages and currents.
Perform diligent inspection of the earthing accessories before each
application.
Panel width 800 mm
Max. short-circuit current and
max. short-circuit duration
= 25 kA / 1 s
Diameter of the fixed contacts in the bushings
60 mm
Rated normal current of feeders
1250 A
Fig. 326: Earthing accessories and earthing rod
(1)
Coupling of the earthing rod
(2)
Limiting ring
(3)
Hand area
(4)
Cross bar
(5)
Earthing clamp
(6)
Screw handle of the earthing clamp
(7)
Spindle of the earthing tulip
(8)
Earthing tulips