Cooper Kyle Form 5/Triple-Single Installation Instructions Manual page 35

SAFETY
FOR LIFE
Grounding with a Remote Supply Voltage Transformer; 4-wire Multi-Grounded,
3-Wire Ungrounded, or Impedance-Grounded
Installation of a Form 5/Triple-Single control with a remote
supply voltage transformer 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.
Pole
Figure 31.
Recommended grounding method for the Form 5/Triple-Single Control installed on 4-wire multi-grounded, 3-
wire ungrounded, or impedance-grounded systems with remote supply voltage transformer.
Form 5/Triple-Single
Supply Voltage
Control
Transformer
AC
NEUTRAL
External
Ground Lug
ELECTRICAL CONNECTIONS - Remote dedicated
supply transformer
Transformer
Surge
Arrester
AC
NEU
GND
Note: Distance between
transformer and
recloser should be
one pole span or less
Pole Ground
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.
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 conductors. Differences between conductor and
ground path lengths can add additional stress to the
control components in the event of a power surge.
Low Voltage Distribution Network
Input
Input
Form 5/Triple-Single
Terminal
Terminal
Control
Block
Block
AC
NEUTRAL
External
Ground Lug
ELECTRICAL CONNECTIONS - using isolation transformer
Surge
Pole
Arrester
Surge
Arrester
CLOSED CLOSED
NOVA-TS
Triple-Single
Recloser
Junction Box
Supply
Voltage
Control
Cable
Pole Ground
S280-42-3
115 Vac
Supply Voltage
Local Isolation
Transformer
Customer
Supplied
Low Voltage
Low Voltage
Arrester
Surge
Arrester
Arrester
Ground
Recloser
Head
Ground
Pole Mounting
Accessory
System
Neutral
Form 5/Triple-Single
Control
Input Terminal
Block
Customer Ground Connection
At External Lug
35