Hubbell CHANCE M3 Installation and operating instructions

Part No. P807-0198
Rev. B 6/96
Theseinstructionsdonotclaimtocoveralldetailsorvariationsinequipment,nortoprovideforallpossibleconditionstobemet
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
INSTRUCTIONS
FOR
INSTALLATION, OPERATION and MAINTENANCE
GENERAL
CHANCE TYPE M3 DISTRIBUTION SWITCH
Figure 1
OPEN LATCH
(OPTIONAL)
160° BLADE OPENING
90° BLADE OPENING
Figure 2
Read and understand these instructions before
installationor operationof thisequipment. 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.
The A. B. Chance Type M3 disconnect switch is a
single-phase hookstick operated switch. It is for
manualswitchingofde-energizedorparallelcircuits
ofoverheadlinesonanelectricaldistributionsystem.
The M3 switch has no current making or breaking
capacity. Designvariationsallowforapplicationsas
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.
SelectaproperlyratedM3switchforeachinstallation
with consideration to continuous current, BIL, and
ratedvoltage. Shouldtherebeanyconcernontheuse
of this M3 switch as rated, consult your supervisor
before installation.
Inspect the switch for damage or missing parts. If
damagefromroughhandlingisevident,immediately
fileaclaimwiththetransportationcompany. Contact
thenearestChancesalesofficeforreplacementparts.
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
suppliedwithanopenbladelatch. Thestoppinmust
be in the 160° hole, as shown in Figure 1, to engage
theopenbladelatch. Attachdeadending(Figure2)
brackets (when supplied) to switch base with
hardware provided and tighten to about 20 foot-
pounds.
▲
!WARNING
®®
POWER SYSTEMS, INC.

Part No. P807-0198
Rev. B 6/96
INSTALLATION
2
Figure 4
Vertical Mount
(STANDARD)
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.
Figure 5
BY PASS
STUD
TERMINAL PAD
TERMINAL
Figure 3 Inverted-Underhung
(STANDARD)
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.
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).
NUTS &
WASHERS
THIS SIDE
ONLY
NUTS & WASHERS
THIS SIDE ONLY

Part No. P807-0198
Rev. B 6/96
3
OPERATION
Only qualified personnel should operate a disconnect
switch. Such personnel should wear appropriate
protective equipment such as rubber gloves, hard hat,
safety glasses, etc., in accordance with established
utility and safety practices.
Donotattempt toopenadisconnect switchtointerrupt
load current. An arc started by opening a disconnect
switch under load could cause injury to personnel or
damage to equipment.
To close the M3 disconnect switch, place the
hookstickinthe pull ringonthe blade androtatethe
bladetoanintermediatepositionasshowninFigure
6. Look away from the switch. Quickly and firmly
drivetheswitchbladetotheclosedposition. Carefully
remove the hookstick from the pull ring to avoid
opening the switch.
TheM3switchisproperlyclosedwhenthebladehook
is fully engaged with the latch portion of the blade
stop as shown in Figure 7.
ToopentheM3disconnectswitch,placethehookstick
in the pull ring as shown in Figure 8.
Look away from the switch. Quickly and firmly pull
down and towards the hinge end of the switch at
about a 45° angle. Once the switch blade is open,
completethebladetraveltoitsstopposition. Carefully
remove the hookstick from the pull ring.
AllChanceM3disconnectswitchesincludeloadbreak
hooks for use with a loadbreak tool. To open the
switch under load, use only an approved loadbreak
toolor device designedfor usewith switches. Follow
the instructions provided with such tools.
Figure 6
Figure 7
Figure 8
▲
!WARNING
▲
!WARNING

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.
• Checkhinge boltforlooseness,andif loose, torque
to40-in.-lb.andapplyLoctite®-271toboltthreads.
• Inspect all blade rivets for tightness and replace
blade if loose.
• Inspect mounting hardware and tighten as
needed (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“IEEEGuidefortheApplication,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.