ARK-GARD
®
ENR Series Receptacles ENP Model M97 Series 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 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.
Eaton’s Crouse-Hinds Business IF 344
1201 Wolf Street, Syracuse, New York 13208 • U.S.A. Revision 8
Copyright © 2014 Revised 11/14
Supercedes 1/09
APPLICATION
ARK-GARD 2
®
ENR Series Receptacles and ENP Series Plugs are used where power is to be supplied to
portable electrical equipment such as compressors, tools, and lighting systems in hazardous and/or cor
-
rosive environments. The ENR Series Receptacle can be operated only by an ENP Series 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 nonhazardous 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 units nameplate.
Insulator/Cord Clamp
Shell
Cord
Contact
Assembly
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.
1 Wire per Lug
INSTALLATION
ENP SERIES PLUG
1.
Loosen two 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 4 cord clamp screws and slide insulator onto cord. (See
Figure 2.) Move shell & insulator up the cord & 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 .540 to .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 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 & clamp
250V -
Black wires to lugs (1 wire per lug)
Green wire to green hex head screw & clamp
125V
250V
Figure 5
Tighten terminal screws to 20 inch/pounds torque.
6.
Slide insulator/cord clamp down cord and position over terminals. The insulator has 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 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 & insulator/cord clamp to allow proper
engagement of two assembly screws into shell. Tighten two assembly screws to 8 inch/
pounds torque.
NOTE:
Face of insulator will protrude 1/16” beyond plug shell when fully seated.
ENR SERIES RECEPTACLE
ENR Series 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 Series Receptacles may be installed
in areas classified as Class I, Group C, D and Class II, Group F, G on single or double gang EDS,
EDSC boxes.
ENR Series 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 screws provided. The
preferred arrangement for the receptacle is with the door hinge on top. Tighten screws to
30 inch-pounds 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.
WARNING
To avoid risk of electric shock, elecrical supply power must be OFF during installation and
maintenance. Installation and maintenenance procedures must be performed by a trained and
competent electrician.
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.)
Insulator Contact
Assembly
1/4”
1
2
Figure 7
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.
CAUTION
Use only copper or copper-clad wire with this receptacle.
WARNING
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.
