MIL-HDBK-1025/10
Do not install distant ground clamps
Install ground clamp
close to potential
Bus
transformer
Permanent bonding lead
D1<<D2
Potential transformer
Fault
Fault
Permanent ground lead
D1
D2
Nonconductive ladder
Figure 5
Substation Temporary Grounding
Table 24
Substation Protective Grounding Procedures
I.
Check validity of permanent equipment grounds.
II. Install a protective ground cable and bond to a grounded structure member or to a common
copper equipment bushing lead for equipment being worked on.
III. Apply personal protective grounds before working within Table 11 clearance distances on
substation equipment including:
A. Bushings
B. Buses
C. Capacitors
D. Circuit breakers
E. Instrument transformers
F. Power transformers
G. Switches
H. Surge arresters
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