External Accessories
75
Neutral Sensing Transformer
1.) Turn off power feeding this device before starting the
installation.
2.) Also turn off any line power within the immediate vicinity
to prevent the incidental or accidental contact of tools by
the installer.
Use transformers with the following breaker frame ratings only
NO4SB NO8SB N12SB N16SB N20SB
SBA0400 SBA0800 SBA1200 SBAl60 SBA2000
SBS0400 SBS0800 SBSl200 SBS1600 SBS2000
SBH0400 SBH0800 SBH1200 SBH1600 SBH2000
Introduction
This neutral sensing transformer is designed to be mounted
on a bus bar with maximum dimensions of 3.00" x .75".
Neutral Sensing Transformer
Neutral sensing transformers are used with 4-wire residual
ground fault protection and ground source schemes.
Neutral Sensing Transformer
Mounting
Position the neutral sensor as close as possible to the asso-
ciated circuit breaker and fabricate two .312 diameter holes
1.75 inches apart in bus, as shown below. Mount the neutral
sensor to the bus as shown with 1/4-20 hardware (not
provided). Torque mounting bolts to 50 in. lbs. maximum.
Bus Mounting
Courtesy of NationalSwitchgear.com
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