Installation of a Form 6 pole-mount recloser control with
a local 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.
4-Wire Multi-Grounded Systems
S280-70-3
19
Surge
Arrester
Recloser
Head Ground
Surge
Arrester
Transformer
Surge
Arrester
Arrester Ground
Recloser
Pole
Supply
Voltage
Pole
Ground
Form 6
Control
Customer Ground Connection
At External Lug
NEU
AC
GND
NEU
AC
Input
Terminal
Block
Control
Cable
AC
NEUTRAL
Form 6 Control
Supply Voltage
Transformer
ELECTRICAL CONNECTIONS
Line to Neutral connected transformer
Input Terminal
Block
External
Ground Lug
Figure 11.
Recommended grounding method for the Form 6 pole-mount recloser control installed on 4-wire multi-grounded,
with local supply voltage transformer.
IMPORTANT: All external inputs to the Form 6 recloser
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.
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 Local Supply Voltage Transformer; 4-Wire Multi-Grounded
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