Maintenance – Hubbell M3 User Manual
Page 4
Part No. P807-0198
Rev. B 6/96
MAINTENANCE
The Chance M3 disconnect switch should require
little maintenance. Following a program of periodic
inspection and maintenance will prolong the life of
the M3 switch.
• Operate the switch periodically to clean contact
surfaces and to free moving parts.
• Check for burned or pitted contacts and replace if
necessary.
• Check hinge bolt for looseness, and if loose, torque
to 40-in.-lb. and apply Loctite®-271 to bolt threads.
• Inspect all blade rivets for tightness and replace
blade if loose.
• Inspect mounting hardware and tighten as
n e eded (12 - 15- ft.lb.)
• Replace any broken or cracked insulators and
clean or replace if heavily contaminated.
For additional recommendations, refer to ANSI
C37.35 “IEEE Guide for the Application, Installation,
Operation, and Maintenance of High Voltage Air
Disconnecting and Load Interrupter Switches.”
4
© Copyright 1996 Hubbell / Chance, 210 N. Allen, Centralia, MO 65240 Printed in USA
®
®
POWER SYSTEMS, INC.
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