Installation of a Form 5/Triple-Single control on a 3-wire
uni-ground system must include the following:
• Protection of the recloser bushings and the supplying
transformer with lightning arresters.
• Grounding of the recloser head and tank.
• Grounding of the transformer tank.
• Grounding of the control cabinet.
• Grounding of the SCADA equipment.
Kyle Form 5/Triple-Single Microprocessor-Based Recloser Control Installation and Operation Instructions
36
Pole
Control
Cable
Customer Ground
Connection
At External Lug
Pole
Ground
NOVA-TS
Triple-Single
Recloser
CLOSED
Surge
Arrester
Surge
Arrester
Pole
Mounting
Accessory
Arrester
Ground
Junction Box
Recloser
Head
Ground
Typical transformer mounting is
180° to the recloser.
NEU
AC
Supply
Voltage
Input Terminal
Block
Form 5/Triple-Single
Control
AC
NEUTRAL
Form 5 Control
Supply Voltage
Transformer
ELECTRICAL CONNECTIONS
Line to Neutral connected transformer
Input Terminal
Block
External
Ground Lug
Surge
Arrester
GND
NEU
AC
Transformer
Control Height must be
3 meters (10 feet)
minimum above earth
CLOSED
Figure 32.
Recommended grounding method for the Form
5/Triple-Single Control installed on a 3-wire uni-
grounded system.
IMPORTANT: All external inputs to the Form 5/Triple-
Single control must be routed within 8 inches of their
corresponding ground. During a surge, a potential of
approximately 1.5 kV per foot can develop in the con-
ductors. Differences between conductor and ground
path lengths can add additional stress to the control
components in the event of a power surge.
IMPORTANT: In pole-mounted applications, a
ground connection must be made between the
recloser, transformer, recloser control, and SCADA
equipment for proper protection of the equipment. The
pole ground must be sized per local utility practices to
minimize the impedance between the recloser and the
control.
WARNING: Hazardous Voltage. Use locally
approved operator safety procedures for proper
insulation when maintaining this equipment. High Volt-
age step and touch potential is characteristic in uni-
ground systems. Failure to comply can cause death or
severe personal injury. T262.0
CAUTION: Exported Potential. Do not make
direct electrical connections to remote devices.
All SCADA equipment must be mounted locally or con-
nected using the fiber-optic or radio communication
accessory. Direct connections to remote devices can
produce exported potential causing equipment dam-
age or personal injury. T263.0
CAUTION: Hazardous Voltage. Do not use a
shared low voltage network to power the recloser
control unless the network is specifically designed to
withstand maximum ground potential rise. Ground
faults on a high voltage network can create a rise in
ground potential. T264.0
Grounding on a 3-Wire Uni-grounded System
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