Installation and Service Instructions for EX
Series
Explosion
-proof Switches
ISSUE 8
50009662
Sensing and Productivity Solutions
WARNING
PERSONAL INJURY
DO NOT USE these products as safety or emergency
stop devices or in any other application where failure of
the product could result in personal injury.
Failure to comply with these instructions could
result in death or serious injury.
WARNING
OPENING PRODUCTS HAZARD
DO NOT OPEN these products when energized or in a
flammable gas atmosphere.
Failure to comply with these instructions could result in
death or serious injury.
WARNING
IMPROPER CONDUIT THREAD USE
DO NOT USE any other conduit thread than the one
identified on the product. Verify that the mating threaded
fitting is identical with the conduit thread shown on the
product nameplate
Failure to comply with these instructions could result in
death or serious injury.
GENERAL INFORMATION
The flame paths of Honeywell's MICRO SWITCH™ EX
explosion-proof switches cool exploding gases below the
ignition temperature before they reach explosive gases
surrounding the housing. The enclosed basic switch is
accessible when the cover is removed. EX series products are
NEMA 1 rated and therefore are not recommended for use in
areas when they will be subjected to liquid splash.
EX series products are listed by Underwriters' Laboratories and
CSA for use in hazardous locations NEMA 7, Class I, Groups C
& D, and NEMA 9, Class II, Group E, F, and G. This includes
vapors of ethyl ether, gasoline, petroleum, alcohol, acetone,
lacquer solvent, natural gas, and atmospheres charged with
grain dust, metal dust, carbon black, coal, or coke dust. Select
EX listings are also listed for Class I, Group B (hydrogen)
atmospheres.
EMISSION OF HOT PARTICLES
• Joint surfaces must be thoroughly cleaned before closing.
Failure to comply with these instructions will result in
death or serious injury.
IMPORTANT: All EX series products comply with UL
Standard: UL 894 and UL 1203, CSA Standard:
C22.2 no. 25-1966, C22.2 no. 30-M1986. EX series products
also meet NEMA 1 enclosure requirements.
Select EX Series products also meet the European Hazardous
Locations Designation: Exd IIB + H2 T6 Gb category II 2 G,
KEMA 04ATEX2312X and complies with the European
Directive on Equipment and Protective Systems Intended for
Use in Potentially Explosive Atmospheres (2014/34/EU)
commonly referred to as the ATEX Directive. Compliance with
the Essential Health and Safety Requirements has been
assured by compliance with EN60079-0:2009 and EN60079-
1:2007. EX series products have an ATEX temperature range
of –40 °C to 70 °C [–40 °F to 158 °F], and when used within
the maximum voltage and current specified on the product will
have no heating problems.
EX AND EXHT Series products also meet the Brazilian
hazardous locations designation:
Ex d IIB+H2 T6 Gb
-40 °C < Tamb +70 °C
Ex d IIB+H2 T2 Gb
-40 °C < Tamb +204 °C
and comply with INMETRO requirements.
Compliance with Essential Health and Safety Requirements
has been assured by compliance with
ABNT NBR IEC 60079-0:2008
ABNT NBR IEC 60079-1:2009
ABNT NBR IEC 60529:2011
Please refer to certificate number TÜV 14.0554 X for
conditions of safe use.
The EXHT Series products have an ATEX temperature range
of -40 °C to 204 °C [-40 °F to 400 °F] and meet the European
Hazard Locations Designation: Exd IIB + H2 T2 Gb category II
2 G. Select EX and EXHT Series products also meet the IEC
Scheme for Explosive Atmospheres IEC Ex Certification (IEC
Ex KEM 08.0027X) for Ex d IIB + H2 T6 or T2 Gb
environments and are compliant with IEC 60079-0:2007 and
IEC 60079-1:2007.
MICRO SWITCH™ EX Series
Issue 8
50009662
2 sensing.honeywell.com
NOTICE
ATEX INSTALLATION INSTRUCTIONS
Cable connection
The cable entry device shall be certified in type of protection
flameproof enclosure "d", suitable for the conditions of use
and correctly installed.
For ambient temperatures above 60 °C [140 °F], cables and
cable glands suitable for a temperature of at least 80 °C [176
°F] are required.
Conduit connection
A certified sealing device in type of protection flameproof
enclosure "d", such as a conduit seal with setting compound
shall be provided immediately to the entrance of the
enclosure.
For ambient temperatures over 60 °C [140 °F], suitable heat
resistant wiring and setting compound in conduit seal shall be
used.
Blanking elements of unused apertures shall be certified in
type of protection flameproof enclosure "d", suitable for the
conditions of use and correctly installed
INSTALLING THE SWITCH
A mounting bracket (15PA85-EX) is furnished at no extra cost
with most EX switches. This permits all rotary operated
switches to be mounted from top, bottom, back or right end.
Plunger switches may be mounted on back, bottom or right
end with this standard bracket. For top mounting of plunger
switches, bracket 15PA86-EX must be purchased separately.
The double conduit switch also has an auxiliary bracket
(included) which permits two-hole mounting from top, back or
bottom. Direct mounting is by means of two 10-32 NF tapped
holes on the top, back or bottom. Any mounting bracket that
does not interfere with the explosion-proof protection of the
enclosure can be used on these products.
15PA85-EX
Fasten bracket to switch with screws furnished. Bracket may
be secured to mounting surface with 0.250 inch machine
screws.
15PA86-EX
Fasten bracket to top of switch with screws furnished. Bracket
may be secured to mounting surface with 0.250 inch machine
screws.
Note: Catalog listing EX-AR20 can be mounted using
Honeywell system sensor bracket OSYEXP or PIBVEXP
without interfering with the explosion-proof protection of the
enclosure.
ELECTRICAL RATINGS
Electrical ratings of EX switches depend on the type of basic
switch enclosed in the housing. Ratings are shown on page 4
along with letter keys (A, B, C, D, E, F,G) shown in table of
listings on page 4.
WIRING INSTRUCTION
Use up to size #14 AWG solid or stranded wires to connect to
the pressure-type connector terminals. Use green wires for
ground leads, red wires for NC leads, blue wires for NO leads,
and black for common leads.
NOTICE for ATEX applications
As ambient temperature approaches 60 °C [140 °F], cable
entry can be 70 °C [158 °F] or higher and cable branching
can be 80 °C [176 °F] or higher, making it important to select
cable that meets these requirements.