Hubbell M3 User Manual
INSTRUCTIONS
INSTALLATION, OPERATION and MAINTENANCE
CHANCE TYPE M3 DISTRIBUTION SWITCH
GENERAL
! W ARNING
▲
Read and understand these instructions before
installation or operation of this equipment. Competent
personnel who understand proper safety procedures
must select, install, and service this equipment. This
instruction guide is written for such personnel. This
guide is not a substitute for adequate training and
experience in safety procedures for this type of
equipment.
FOR
The A. B. Chance Type M3 disconnect switch is a
single-phase hookstick operated switch. It is for
manual switching of de-energized or parallel circuits
of overhead lines on an electrical distribution system.
The M3 switch has no current making or breaking
capacity. Design variations allow for applications as
an electrical distribution switch or as an electrical
station switch. A number of options (connectors,
captive hardware, by-pass studs, etc.) are available
to better fit the user’s needs.
Select a properly rated M3 switch for each installation
with consideration to continuous current, BIL, and
rated voltage. Should there be any concern on the use
of this M3 switch as rated, consult your supervisor
before installation.
Inspect the switch for damage or missing parts. If
damage from rough handling is evident, immediately
file a claim with the transportation company. Contact
the nearest Chance sales office for replacement parts.
The M3 switch is supplied with a blade stop pin.
Before raising the switch for mounting, place this
pin in the proper hole to obtain either a 90° or 160°
(Figure 1) blade opening. Some switches may be
supplied with an open blade latch. The stop pin must
be in the 160° hole, as shown in Figure 1, to engage
the open blade latch. Attach deadending (Figure 2)
brackets (when supplied) to switch base with
hardware provided and tighten to about 20 footpounds.
OPEN LATCH
(OPTIONAL)
90° BLADE OPENING
160° BLADE OPENING
Figure 1
Figure 2
These instructions do not claim to cover all details or variations in equipment, nor to provide for all possible conditions to be met
with concerning installation, operation, or maintenance of this equipment. If further information is desired or if particular
problems are encountered which are not sufficiently covered in this guide, contact A. B. Chance Company.
NOTE: Because Hubbell has a policy of continuous product improvement, we reserve the right to change design and specifications without notice.
© Copyright 1996 Hubbell / Chance., 210 N. Allen, Centralia, MO 65240 Printed in USA
®
POWER SYSTEMS, INC.
®
Part No. P807-0198
Rev. B 6/96
INSTALLATION
The distribution style M3 disconnect switch is
made for mounting to either a single or double
crossarm in an inverted (Figure 3) or vertical
position (Figure 4).
NOTE: Four bolts must be used to mount on a
double crossarm. Two bolts in center only
may cause over bending of backstrap or base.
Position the M3 switch on the crossarms using the
backstrap. Adjust the bolt heads in the switch
base slots as needed to closely fit the crossarms as
in Figures 3-4. Tighten mounting hardware to
about 12-15 foot-pounds.
Deadend conductors using your utility’s normal
practices.
Wire brush terminal pads and apply a coating of
oxidation inhibitor such as Chance z.l.n. (100 or
200).
If your switch is equipped with by-pass studs,
assemble between terminal pad and terminal. See
Figure 5.
(STANDARD)
NUTS &
WASHERS
THIS SIDE
ONLY
Figure 4
Vertical Mount
Wire brush connector mounting surfaces and
attach to terminal pads as shown in Figure 5 with
hardware facing away from insulators. Wire brush
electrical conductors and apply a coating of
oxidation inhibitor such as Chance z.l.n. (100 or
200) before inserting into connector. Tighten
connector hardware to about 30 foot-pounds (1/2"
hardware).
(STANDARD)
NUTS & WASHERS
THIS SIDE ONLY
TERMINAL PAD
BY PASS
STUD
TERMINAL
Figure 5
Figure 3 Inverted-Underhung
2
Part No. P807-0198
Rev. B 6/96
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