Eaton Crouse-Hinds Ark-Gard ENR Series Installation & Maintenance Information

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Ark-Gard ENR receptacles ENP model M97 plugsInstallation & maintenance informationSAVE THESE INSTRUCTIONS FOR FUTURE REFERENCEIF 344All 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-HindsDivision’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 3441201 Wolf Street, Syracuse, New York 13208 • U.S.A. Revision 9Copyright © 2018 Revised 08/18Supersedes 11/14APPLICATIONArk-Gard® 2 ENR receptacles and ENP plugs are used where power is to be supplied to portableelectrical equipment, such as compressors, tools and lighting systems in hazardous and/or corrosiveenvironments. The ENR receptacle can be operated only by an ENP plug. However, ENP plugs canbe used in any matching standard NEMA receptacle located in ordinary locations, allowing the portableequipment 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. Actualoperation must comply with the information stipulated on the unit’s nameplate.Insulator/cord clampShellCordContactassemblyINSTALLATIONENP PLUG1. Loosen two (2) mounting screws (#4-40 x 5/8” long) in plug face, but do not remove all theway to maintain captive feature. Remove contact assembly, insulator and cord strain reliefclamp. Note orientation of insulator before complete removal (see Figure 1). Be carefulnot to lose the mounting screws.Figure 12. Slide shell onto cord. Loosen four (4) cord clamp screws and slide insulator onto cord (seeFigure 2). Move shell and insulator up the cord and away from cord end so you can freelywork on the cord end and prepare the conductors for termination.Figure 2NOTE: Use #12 or #14 AWG type S, SO, ST or STO cord with range of 0.540 to 0.635 inchesdiameter. DO NOT use cord of smaller diameter.3. Strip cord sheath and wire insulation according to dimensions shown in Figure 3. Be carefulnot to damage individual conductors or their insulation.Figure 34. Loosen screws in pressure connectors of all three (3) contacts enough so conductor can beinserted between connector plates and contact ends. DO NOT put conductor under pressurescrews.Figure 45. Attach conductors (see Figure 5).125V - White wire to silver lugBlack wire to copper lugGreen wire to green hex head screw and clamp250V - Black wires to lugs (one wire per lug)Green wire to green hex head screw and clamp125V 250VFigure 5Tighten 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 aligninsulator properly, then slide insulator to within 1/4” of surface of contact assembly (see Figure6).Figure 67. Tighten cord clamp by tightening four (4) cord clamp screws. Slowly increase the torqueevenly 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 properengagement 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 RECEPTACLEENR receptacles may be installed in areas classified as Class I, Group B locations whenmounted on a single-gang only EDS box equipped with EYS sealing fittings mountedimmediately adjacent to the box (close nippled). Also, ENR receptacles may be installed in areasclassified as Class I, Groups C, D and Class II, Groups F, G on single- or two-gang EDS, EDSCboxes. ENR receptacles are not suitable for use in Class II, Group E environments, including whenused as ENR GFCI kit (example: ENR22201 GFI).ENR receptacles should not be mounted on more than five multi-gang modular control devicebodies without intervening seals.1. Mount back box in desired position following methods that comply with NEC and any localcodes.2. Pull all power source wiring into back box. Be sure wires are long enough to make properconnections.3. Attach power source conductors to receptacle terminals in an approved manner. Blackconductor is attached to bronze screw; white conductor is attached to silver cadmiumscrew; 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. Thepreferred arrangement for the receptacle is with the door hinge on top. Tighten screws to30 in.-lbs. torque.HOW TO OPERATE1. 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 actionand complete the electrical circuit.3. Release plug, allowing it to move outwardly slightly, into a locking detent position. Checkby 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.MAINTENANCEPerform visual, electrical and mechanical checks of all components on a regular schedule. Thisshould be determined by the environment and frequency of use, but it is recommended that itshould 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.InsulatorCord clampCord clampscrews (4)ContactassemblyMountingscrewsCAUTIONTo avoid risk of electrical shock:Be sure grounding strap is located in proper position (see Figure 4).1 2Figure 7WARNINGTo avoid personal injury or explosion:Use only copper or copper-clad wire with this receptacle.WARNINGTo avoid personal injury or explosion:If any part of these plugs and/or receptacles appears to be broken or shows signs of anydamage - DISCONTINUE USE IMMEDIATELY. Replace, or properly repair, the item(s) BEFOREcontinuing service.Green hex headscrew - green orground wireGreen hex headscrew - green orground wireSilverlug - whiteor neutralwireCopper lug - hot orblack wireBlack or hot wires to lug;one wire per lugInsulator Contactassembly1/4”CAUTIONConduit sealing fittings MUST BE installed in Class I, Group B locations to comply with therequirements in the latest edition of the NEC, Section 501-5 and/or 502-5 plus any otherapplicable standards. Sealing fittings must be close nippled to the enclosure.WARNINGTo avoid risk of electric shock:Electrical supply power must be OFF during installation and maintenance. Installation andmaintenenance procedures must be performed by a trained and competent electrician.

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