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DRILLED AND TAPPED CONDUIT OPENINGS
MINIMUM CENTER-TO-CENTER DISTANCE (IN.)
Conduit
1/2
3/4
1
1-1/4 1-1/2
Size
1/2
1-1/2
3/4
1-5/8
1-3/4
1
1-3/4
1-7/8
2
1-1/4
2
2-1/8
2-1/4
2-1/2
1-1/2
2-1/8
2-1/4
2-3/8
2-5/8
2
2-3/8
2-1/2
2-5/8
2-7/8
2-1/2
2-3/4
2-7/8
3-1/8
3-1/4
3
3-1/8
3-1/4
3-3/8
3-1/2
3-1/2
3-3/8
3-1/2
3-5/8
3-7/8
4
3-3/4
3-7/8
4
4-1/8
5
4-3/4
4-7/8
5
5-1/8
6
5-1/4
5-3/8
5-1/2
5-3/4
Minimum clearance for unions only.
METRIC EQUIVALENTS
NPT Conduit Size
1/2
3/4
1
1-1/4
1-1/2
2
2-1/2
•
For conduit entries with non-interfering vertical seals: center-to-center
distance is the total of: 1/2 the outside diameter of the larger conduit plus
the turning radius of the sealing fitting used in the smaller conduit plus 1/4
inch clearance.
• For conduit entries with non-interfering horizontal seals: center-to-center
distance is the total of: 1/2 the outside diameter of the larger conduit plus
the turning radius of the sealing fitting used in the smaller conduit plus 2
inches clearance for pouring.
While the number of openings derived from the above will result in a safe
configuration, the number of openings could be reduced if center-to-center
spacings were required to be increased for the following reason:
•
If sealing fittings are required to be installed in the conduit, sufficient room
must be provided to install, pack, and pour the fitting after the conduit and
fittings are installed and the conductors are in place. This is particularly
important in horizontal conduit runs, when fittings are directly over one
another.
The space between drilled & tapped conduit entries is a factor of the
following considerations:
•
Ability to install conduit with a variety of fittings (for various reasons, the
conduit which is to be threaded into each conduit entry may, in turn, be
threaded into a variety of fittings including (but not limited to) the
following: unions, sealing fittings of various types, and GUA type fittings.
Dimensions of these fittings are provided in the Crouse-Hinds catalog,
and should be referred to in planning a conduit layout).
•
All drilled and tapped conduit entries must fall completely within the
defined areas as specified in Table 1.
FOR ATEX ENCLOSURES:
• Before opening the enclosure in a flammable atmosphere, circuits must be
interrupted.
• The approval applies to equipment without cable glands. When mounting
the flameproof enclosure in a hazardous area, only rigid metal conduit
All statements, technical information and recommendations contained herein are based on information and tests we believe to be reliable. The accuracy or completeness thereof are not guaranteed. In
accordance with Crouse-Hinds "Terms and Conditions of Sale," and since conditions of use are outside our control, the purchaser should determine the suitability of the product for his intended use and
assumes all risk and liability whatsoever in connection therewith.
2
2-1/2
3
3-1/2
2-3/4
3
3-1/4
3-3/8
3-5/8
3-7/8
3-5/8
4
4-1/4
4-5/8
4
4-1/4
4-1/2
4-7/8
5-1/8
4-1/4
4-1/2
4-7/8
5-1/8
5-3/8
5-3/4
5-1/4
5-1/2
5-3/4
6-1/8
6-3/8
6-5/8
5-7/8
6-1/8
6-3/8
6-5/8
6-7/8
7-1/8
TABLE 3
Metric Openings
M16
M20
M25
M32
M40
M50
M63
TABLE 4
CAUTION
CAUTION
Cooper Industries Inc.
Crouse-Hinds Division
PO Box 4999, Syracuse, New York 13221 • U.S.A.
Copyright © 2008, Cooper Industries, Inc.
systems or flameproof cable glands certified to EN60079 must be used.
• All unused conduit entries must be closed with a flameproof plug certified to
EN60079.
4
5
6
• Any components attached or installed (e.g. terminal compartments,
bushings, explosionproof cable entries, connectors) shall be of a technical
standard that complies with the specifications on the cover sheet as
minimum and for which a separate type examination certificate has been
issued. The operating conditions set forth in the relevant component
certificates must by all means be complied with.
Securely fasten enclosure to the mounting location, then attach into conduit
system.
7-1/4
The EJB shall be connected by means of suitable cable entries or conduit
7-3/4 8-1/4
systems, which meet the requirements of EN60079-1, Sections 13.1 and
13.2, and for which a separate type examination certificate has been issued.
Terminate ground wire with
wire gauge (10 AWG minimum). Install ground wire such that it cannot
become loose or twisted.
The enclosure is intended for wiring connections only, or for controller
devices or other equipment which fall within the electrical parameters
indicated above.
Note: Cable entries as well as sealing plugs of simple construction must not
be used.
Cable entries (conduit threads) and sealing plugs of simple designs must not
be used. Should the EJB be connected by means of a conduit entry which
has been approved for this purpose, the required sealing device shall be
provided immediately at the terminal box.
Any openings not used shall be sealed as specified in EN60079-0, Section
13.3.
The connecting wire of the EJB shall be installed to provide for permanent
wiring and adequate protection against mechanical damage.
If the temperature at entry fittings should exceed 70ºC, the connecting cables
used have to be of the temperature-resistant type.
MAINTENANCE
Always disconnect primary power source before opening enclosure for
inspection or service.
1. Frequent inspection should be made. A schedule for maintenance check
should be determined by the environment and frequency of use. It is
recommended that it should be at least once a year.
2. Perform visual, electrical, and mechanical checks on all components on a
regular basis.
• Visually check for undue heating evidenced by discoloration of wires
or other components, damaged or worn parts, or leakage evidenced
by water of corrosion in the interior.
• Electrically check to make sure that all connections are clean and tight
and that contacts in the components make or break as required.
• Mechanically check that all parts are properly assembled and
operating mechanisms move freely.
3. EJB gasketed junction boxes: do not attempt field replacement or repair
of cover gasket. Instead, remove damaged gasket and continue to use
cover without gasket. This will assure safety for use in Class I and Class
II hazardous (classified) locations. However, the enclosure will not be
watertight.
Clean both ground-joint surfaces of body and cover before closing. Dirt or
foreign material must not accumulate on flat ground-joint surfaces. Surfaces
must seat fully against each other to provide a proper explosionproof seal.
Cooper Crouse-Hinds recommends an Electrical Preventative Maintenance
Program as described in the National Fire Protection Association Bulletin NFPA
70B.
5
⁄
" ring terminal appropriately sized for ground
1 6
WARNING
CAUTION
Supercedes 06/08
IF 931
Revision 8
Revised 08/08
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