Eaton Crouse-Hinds GHG 72 Series Operating Instructions Manual

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Eaton Crouse-Hinds GHG 72 Series Operating Instructions Manual Manual pdf 10 page image

106 InstallationFor the mounting and operation, therespective national regulations as well asthe general rules of engineering shall beobserved (IEC/EN 60079-14).XATEX - IEC When mounting the separately certifiedterminals, the clearance an creepage distancemust be observed in accordance to table 1 ofIEC/EN 60079-7.6.1 MountingThe plastic boxes can be mounted withoutopening their enclosure.When mounting the terminal boxes directlyonto the wall, they shall rest evenly only on thefastening points provided for them. The chosenscrew must match the fastening hole (seedimensional drawings page 8) and they shallnot damage the hole (e.g. use of a washer).The terminal boxes must be fastened diagonallyby means of at least 2 screws.If the screws are overtightened, theplastic terminal boxes may be damaged.The plastic terminal boxes GHG 721 0 andGHG 721 0 are suitable for fastening onto CCH/EATON apparatus holders by meansof self-cutting screws and clip-on mounting(see fig. 4 - 7, page 11 + 12).The respective mounting instructionswill have to be observed.6.2 Opening the apparatus/Electrical connectionaThe electrical connection of theapparatus may only be carried out byskilled staff (IEC/EN 60079-14).The minimum clearances and creepagedistances in accordance with IEC/EN 60079-7,Table 1, shall be observed.The table indicating the current load valueswhich is provided on the cover inside of theterminal boxes is to be observed.In order to maintain the mode of protection, theconductors will have to be connected withspecial care.The insulation shall reach up to theterminal. The conductor itself shall notbe damaged.The connectable min. and max. conductorcross-sections will have to be observed.All screws and/or nuts of the supply terminals,and unused terminals, shall be tightened down.The fitted standard terminals are designed fordirect connection of conductors with coppercores.If stud terminals are fitted, DIN cable lugs shallbe used.The cable lugs should be crimped ontothe cable in a workmanlike manner. It is tobe ensured that the required min. air gapsare kept (at 690V ->12mm).When combining Ex-e/Ex-i it is essential tomaintain the separation, air and creepagedistances. The Ex-i circuit wires are to be laidseparately from the Ex-e circuit wires(see e.g. EN/IEC 60079-11).The connection wires of the Ex-i circuits areto be marked (e.g. by colour, light blue).After removing the terminal rail (in order tofacilitate the entry of cables), the terminal railshall again be properly put in place beforeestablishing the electrical connection.Removal and mounting of the terminal rail areperformed as follows:By pressing apart the enclosure sides, theterminal rail can be detached from the bottompart of the enclosure.In order to install the terminal rail, it is fittedonto the catch on one side of the enclosure walland then snapped in on the opposite enclosurewall (see fig. 3).The PE rail can optionally be fitted in 4 positions(see fig.1):A Enclosure top side - PE-connection bottomB Enclosure top side - PE-connection topC Enclosure bottom side - PE-connection bottomD Enclosure bottom side - PE-connection topThe PE rail is fitted as follows: It has to bepushed home in the respective guide rails thatare integrated into the lateral enclosure walls.The rail must engage into the receptacleon the bottom of the housing. Care has tobe taken that the PE rail has such a positionthat a proper conductor connection isensured.In the case of building up the electricalequipment in the "protective insulation" version,appropriate sticker GHG 905 1002 P0005 canbe requested by the manufacturer.If the inserted terminal rail is not equippedcompletely with line-up terminals, the terminalrail must be included in the equipotential earthconnection also.Fig. 1Fig. 2Fig. 3ABCD12Explosion protected terminal boxes type, GHG 72. GB