6 December 2006
Including change 1, 7 December 2006
9-7.4.2 Shut all access doors on the device while installing and removing the device.
Use padlocks on any door where studs are intended to remain energized and access is
not needed for testing.
9-7.4.3 After installing the device, verify by using a voltage detector that exposed
studs are deenergized.
9-7.4.4 Install the ground cables, with the device end of the ground cables connected
last (and disconnected first upon removal of the ground cables). For a stud-type device,
the ground cables must be connected with the device in the "disconnect" position. For a
bale-type device, the ground cables can be connected with the device in either the
"disconnect" or the "engage" position.
For the Navy, a manufacturer-approved grounding breaker can be used for
access to the terminals for procedures of connecting temporary protective grounds to
ground the main bus, ground the incoming lines or ground both the main bus and the
For the Navy, phasing tests on circuits must be accomplished by using
ground ball studs on outgoing cable termination pads or synchronizing check controls in
conjunction with ground ball studs on outgoing cable termination pads. It is no longer
permissible to conduct phasing tests using the shutters of a high-voltage switchgear
cell. Existing equipment should be retrofitted during preventive maintenance cycles.
Basis for Safety Requirements.
9-8.1.1 Batteries and DC system components are different from AC electrical system
equipment. Batteries contain acid, which is harmful to skin and eyes, and the electrical
shock hazards associated with DC power can be more severe than those associated
with AC power for equivalent voltages and currents.
9-8.1.2 Only authorized personnel who have been familiarized and trained on battery
fundamentals and maintenance procedures are allowed to perform maintenance-related
activities on a battery.
9-8.1.3 The following industry standards provide the most complete safety standards
for stationary batteries and DC systems. Refer to the appropriate document for the type
of battery used in a particular application.
ANSI/IEEE 450, IEEE Recommended Practice for Maintenance, Testing,
and Replacement of Vented Lead-Acid Batteries for Stationary