Ark-Gard ENR receptacles ENP model M97 plugs
Installation & maintenance information
SAVE THESE INSTRUCTIONS FOR FUTURE REFERENCE
IF 344
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 Eaton’s Crouse-Hinds
Division’s “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.
Eaton’s Crouse-Hinds Division IF 344
1201 Wolf Street, Syracuse, New York 13208 • U.S.A. Revision 9
Copyright © 2018 Revised 08/18
Supersedes 11/14
APPLICATION
Ark-Gard
®
2 ENR receptacles and ENP plugs are used where power is to be supplied to portable
electrical equipment, such as compressors, tools and lighting systems in hazardous and/or corrosive
environments. The ENR receptacle can be operated only by an ENP plug. However, ENP plugs can
be used in any matching standard NEMA receptacle located in ordinary locations, allowing the portable
equipment to be transferred from hazardous to non-hazardous areas.
Ark-Gard 2 ENP plugs and ENR receptacles are rated at 15 and 20 amperes at either 125 or 250 VAC. Actual
operation must comply with the information stipulated on the unit’s nameplate.
Insulator/cord clamp
Shell
Cord
Contact
assembly
INSTALLATION
ENP PLUG
1.
Loosen two (2) mounting screws (#4-40 x 5/8” long) in plug face, but do not remove all the
way to maintain captive feature. Remove contact assembly, insulator and cord strain relief
clamp. Note orientation of insulator before complete removal (see Figure 1). Be careful
not to lose the mounting screws.
Figure 1
2.
Slide shell onto cord. Loosen four (4) cord clamp screws and slide insulator onto cord (see
Figure 2). Move shell and insulator up the cord and away from cord end so you can freely
work on the cord end and prepare the conductors for termination.
Figure 2
NOTE:
Use #12 or #14 AWG type S, SO, ST or STO cord with range of 0.540 to 0.635 inches
diameter. DO NOT use cord of smaller diameter.
3.
Strip cord sheath and wire insulation according to dimensions shown in Figure 3. Be careful
not to damage individual conductors or their insulation.
Figure 3
4.
Loosen screws in pressure connectors of all three (3) contacts enough so conductor can be
inserted between connector plates and contact ends. DO NOT put conductor under pressure
screws.
Figure 4
5.
Attach conductors (see Figure 5).
125V -
White wire to silver lug
Black wire to copper lug
Green wire to green hex head screw and clamp
250V -
Black wires to lugs (one wire per lug)
Green wire to green hex head screw and clamp
125V
250V
Figure 5
Tighten terminal screws to 20 in.-lbs. torque.
6.
Slide insulator/cord clamp down cord and position over terminals. The insulator has two (2)
slots that engage with the arc barrier walls and provide proper orientation. Take care to align
insulator properly, then slide insulator to within 1/4” of surface of contact assembly (see Figure
6).
Figure 6
7.
Tighten cord clamp by tightening four (4) cord clamp screws. Slowly increase the torque
evenly on each screw, repeating the sequence as necessary to a torque of 10-12 in.-lbs.
Clamp halves must secure the cord evenly without any misalignment between them.
8.
Slide shell down cord, aligning contact assembly and insulator/cord clamp to allow proper
engagement of two (2) assembly screws into shell. Tighten two (2) assembly screws to 8 in.-
lbs. torque.
NOTE:
Face of insulator will protrude 1/16” beyond plug shell when fully seated.
ENR RECEPTACLE
ENR receptacles may be installed in areas classified as Class I, Group B locations when
mounted on a single-gang only EDS box equipped with EYS sealing fittings mounted
immediately adjacent to the box (close nippled). Also, ENR receptacles may be installed in areas
classified as Class I, Groups C, D and Class II, Groups F, G on single- or two-gang EDS, EDSC
boxes. ENR receptacles are not suitable for use in Class II, Group E environments, including when
used as ENR GFCI kit (example: ENR22201 GFI).
ENR receptacles should not be mounted on more than five multi-gang modular control device
bodies without intervening seals.
1.
Mount back box in desired position following methods that comply with NEC and any local
codes.
2.
Pull all power source wiring into back box. Be sure wires are long enough to make proper
connections.
3.
Attach power source conductors to receptacle terminals in an approved manner. Black
conductor is attached to bronze screw; white conductor is attached to silver cadmium
screw; and green grounding conductor is attached to the green screw.
4.
Push wiring into back box and attach receptacle using the four (4) screws provided. The
preferred arrangement for the receptacle is with the door hinge on top. Tighten screws to
30 in.-lbs. torque.
HOW TO OPERATE
1.
Insert plug into receptacle as far as it will go.
2.
Turn clockwise as far as it can go. Internal contacts of the receptacle are closed by this action
and complete the electrical circuit.
3.
Release plug, allowing it to move outwardly slightly, into a locking detent position. Check
by trying to turn and/or pull out without any inward pressure. Plug should not pull out.
4.
To remove plug, press inward, turn counterclockwise and pull straight out.
MAINTENANCE
Perform visual, electrical and mechanical checks of all components on a regular schedule. This
should be determined by the environment and frequency of use, but it is recommended that it
should be at least once a year.
1.
Make sure screws holding receptacle to back box are tight.
2.
Clean receptacle face thoroughly.
3.
Make sure screws holding insulator in plug body are tight.
4.
Clean all exterior parts of plug thoroughly.
Insulator
Cord clamp
Cord clamp
screws (4)
Contact
assembly
Mounting
screws
CAUTION
To avoid risk of electrical shock:
Be sure grounding strap is located in proper position (see Figure 4).
1
2
Figure 7
WARNING
To avoid personal injury or explosion:
Use only copper or copper-clad wire with this receptacle.
WARNING
To avoid personal injury or explosion:
If any part of these plugs and/or receptacles appears to be broken or shows signs of any
damage -
DISCONTINUE USE IMMEDIATELY.
Replace, or properly repair, the item(s)
BEFORE
continuing service.
Green hex head
screw - green or
ground wire
Green hex head
screw - green or
ground wire
Silver
lug - white
or neutral
wire
Copper lug - hot or
black wire
Black or hot wires to lug;
one wire per lug
Insulator Contact
assembly
1/4”
CAUTION
Conduit sealing fittings MUST BE installed in Class I, Group B locations to comply with the
requirements in the latest edition of the NEC, Section 501-5 and/or 502-5 plus any other
applicable standards. Sealing fittings must be close nippled to the enclosure.
WARNING
To avoid risk of electric shock:
Electrical supply power must be OFF during installation and maintenance. Installation and
maintenenance procedures must be performed by a trained and competent electrician.
