Eaton CROUSE-HINDS SERIES Operating Instructions Manual

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Eaton CROUSE-HINDS SERIES Operating Instructions Manual Manual pdf 23 page image

232 Safety instructionsTarget group:For skilled electricians and suitablequalified, instructed personnel inaccordance with national legislation,including the relevant standards and, whereapplicable, in acc. with IEC/EN 60079-14 onelectrical apparatus for explosive atmospheres.The plastic or stainless steel control unitsGHG 44. are not suitable for zone 0 and zone20 hazardous areas.The temperature class and explosion groupmarked on the control units shall be observed.Modifications to the control units orchanges of their design are not permitted.They shall be used for their intendedpurpose and in perfect and clean condition.Prior to their taking into operation, the controlunits will have to be checked in accordancewith the instructions as per section 6.The requirements of the IEC/EN 6007931regarding excessive dust deposits andtemperature to be considered from the user.Observe the national safety rules andregulations for prevention of accidents aswell as the safety instructions included inthese operating instructions set in italics thesame as this text!3 Conformity with standardsThe apparatus are conform to the standardsspecified in the EC-Declaration of conformity,enclosed separately.References to standards and directives in theseoperating instructions always relate to the latestversion. Other additions (e.g. details relating tothe year) shall be observed.4 Field of applicationThe plastic or stainless steel control unitsGHG 44. are suitable for use in zone 1, 2 and21, 22 hazardous areas acc. toIEC/EN 60079-10-1 and IEC/EN 60079-10-2.The enclosure materials employed, includingthe exterior metal parts, are made of high-qualitymaterials which ensure a corrosion protectionand resistance to chemical substancescorresponding to the requirements in a “normalindustrial atmosphere”:- glass-fibre reinforced polyester- impact resistant polyamide- special steel AISI 316 LIn case of use in an extremely aggressiveatmosphere, you can obtain informationconcerning the chemical resistance of thematerials used from your Cooper Crouse-Hindsbranch.5 Application / PropertiesThe plastic or stainless steel control unitsGHG 44. are designed for the on-site control ofelectrical installations in explosive atmospheres.The devices are individually fitted with built-incomponents that meet their specific application.The control units can, at option, be deliveredfitted with series terminals up to 2,5mm² underthe hinged framework and wired ready forconnection by the customer.Adequately marked special versions of thecontrol units can be operated in ”intrinsicallysafe circuits“.The electric limiting values applicable to”intrinsic safety“ shall be observed.The respective details on the equipment withelectrical contacts are given on the componentbases. The version fitted with gold-tippedcontacts is marked with a ”G“ (for max. currentload see Technical data).In order to achieve a reliable isolation, thenormally closed contacts are designed asforced break contacts.Where required, the bases are fitted with 0.6 Wresistors, fine-wire fuses and diodes (max.dissipated energy 1 W).The measuring instrument serves for theindication on-site of electrical values. For thetype of measuring mechanism, accuracy andconnected version, see ”Technical data“).When the switching collar on small controlswitches is cut out at the respective lockingposition, they can be padlocked (locking shackleØ up to 5 mm). Ex 23 control switch actuatorelements shall be provided with a drilled hole of5.5 mm Ø at the respective locking position ontheir switching collar and can thus be padlockedas described before.In these enclosures, the 4-pole pushbuttoncontact block requires 2 standard contact blockmounting spaces.The actuator is situated in the centre of the 2mounting spaces.The 4 pole pushbutton contact can be addedwith the standard CCH actuators.If the 4 pole pushbutton contact is added withan Emergency STOP Mushroom-head pushbut-ton actuator, then you have to use the actuatorswith CCH order number GHG 410 1437R.... .This actuators can be recognize by the redthrust washer and black inserting sign.At option, the Ex 29 control switches areprovided with a fitted locking device so thatthey can also be padlocked.GBExplosion protected control unitsmade of plastic or stainless steel type GHG 44.