Cooper Lighting S280-79-10 - Manual (Page 36)

Installation of a Form 5 control with a remote supply volt-
age 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
Kyle Form 5, Form 5 UDP, Form 5 DC NOVA Recloser Control Installation and Operation Instructions
36
Surge
Arrester
Recloser
Head
Ground
Supply
Voltage
Pole
Ground
Pole
Recloser
Pole
Surge
Arrester
Transformer
Arrester
Ground
Form 5 LS Control
HOT
NEU
GND
NEU AC
Input Terminal Block
Control Cable
Surge
Arrester
Arrester
Ground
Customer Ground Connection
at External Lug
AC
NEUTRAL
Form 5 LS Control
Supply Voltage
Transformer
ELECTRICAL CONNECTIONS - Remote dedicated
supply transformer
Form 5 LS Control
AC
NEUTRAL
Input
Terminal
Block 115 Vac
Supply Voltage
Local Isolation
Transformer
ELECTRICAL CONNECTIONS - using isolation transformer
Customer
Supplied
Low Voltage
External
Ground Lug Low Voltage
Arrester
Note: Distance between
transformer and
recloser should be
one pole span or
less
System
Neutral
External
Ground Lug
Input
Terminal
Block
Low Voltage Distribution Network
Figure 30.
Recommended grounding method for the Form 5 Control installed on 4-wire multi-grounded, 3-wire
ungrounded, or impedance-grounded systems with remote supply voltage transformer.
IMPORTANT: All external inputs to the Form 5 con-
trol must be routed within 8 inches of their correspond-
ing ground. During a surge, a potential of
approximately 1.5kV 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.
Grounding with a Remote Supply Voltage Transformer; 4-Wire Multi-Grounded,
3-Wire Ungrounded, or Impedance-Grounded