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DOE-HDBK-1092-98
1. Provide protective covers and/or barriers over terminals and other live parts to protect
personnel.
2. By suitable marking, identify the hazard at the power source and at appropriate places.
3. Consider magnetic forces in both normal-operation and short-circuit conditions. Use conductors
that have appropriate physical strength and are adequately braced and supported to prevent
hazardous movement.
10.8.2.3
OPERATION AND MAINTENANCE
Follow these guidelines for working on circuits operating at 50 V or less that are treated as hazardous:
1. Work on such circuits when they are de-energized.
2. If it is essential to work on or near energized low-voltage, high-current circuits, observe the
safety rules as if the circuits were operating at more than 50 V. Refer to Section 2.1.2,
"Considerations for Working on Energized Systems and Equipment" and 2.13.4, "Safe
Energized Work (Hot Work)."
10.8.3 CONDITIONS OF HIGH VOLTAGE AND LOW CURRENT
10.8.3.1
HAZARDS
When the output current of high-voltage supplies is below 5 mA, the shock hazard to personnel is
low. Where combustible atmospheres or mixtures exists, the hazard of ignition from a spark may
exist. High-voltage supplies (ac or dc) can present the following hazards:
1. Faults, lightning, or switching transients can cause voltage surges in excess of the normal
ratings.
2. Internal component failure can cause excessive voltages on external metering circuits and low-
voltage auxiliary control circuits.
3. Overcurrent protective devices such as fuses and circuit breakers for conventional applications
may not adequately limit or interrupt the total inductive energy and fault currents in highly
inductive dc systems.
4. Stored energy in long cable runs can be an unexpected hazard. Safety instructions should be
in place to ensure proper discharge of this energy.
5. Secondary hazards such as startle or involuntary reactions from contact with high-voltage
low-current systems may result in a fall or entanglement with equipment.
10.8.3.2
DESIGN CONSIDERATIONS
Personnel in R&D labs may encounter energized parts in a variety of configurations, locations, and
under environmental conditions that are not usual for most electrical power personnel. Sometimes
the equipment can be designed to incorporate mitigation of the hazards associated with working on
such equipment. If not, then safe operating procedures must be developed and used.
10-7


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