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Delta and Resistance-Grounded Power Systems
HAZARD OF ELECTRIC SHOCK, EXPLOSION, OR ARC FLASH
• For resistance-grounded system maintain an over-damped state to limit voltage overshoot and duration during
operation.
• Verification and adjustment of correct power system damping should be done following power system modifica-
tions and periodically, as part normal system maintenance.
Failure to follow these instructions will result in death or serious injury.
This product is intended for use on resistance-grounded power systems where the power system has been set
for, and is maintained in, an over-damped state. For the power system to be over-damped, the current through
the grounding resistor during a bolted phase-to-ground fault must be significantly greater than the total
charging current of the system.
Periodic engineering evaluation of the power system is required to determine the worst-case charging current
of th e system and to adjust the grounding resistance accordingly. As the power system is modified, the value
of the grounding resistor must be evaluated and adjusted to maintain the system in the over-damped state.
Installation
HAZARD OF ELECTRIC SHOCK, EXPLOSION, OR ARC FLASH
• Apply appropriate personal protective equipment (PPE) and follow safe electrical work practices. See NFPA 70E,
CSA Z462 or NOM-029-STPS.
• This equipment must only be installed and serviced by qualified electrical personnel.
• Turn off all power supplying this equipment before working on or inside equipment.
• Always use a properly rated voltage sensing device to confirm power is off.
• Replace all devices, doors and covers before turning on power to this equipment.
• This equipment must be effectively grounded per all applicable codes. Use an equipment-grounding conductor to
connect this equipment to the power system ground.
Failure to follow these instructions will result in death or serious injury.
Conduit Location and Recommendations
The recommended conduit entry is at the bottom or either side of the device enclosure. Use a conduit seal
that is appropriate for the enclosure rating.
DANGER
DANGER
SPD200K/300K
Page: 7
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