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CEAG Sicherheitstechnik GmbH Inst & Maint 250804.ppt/01.08.2002/Eg/

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Installation, Inspection and Maintenance of Electrical Installations in

Potentially Explosive Atmospheres

in accordance with IEC 60079-14 and IEC 60979-18


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• General requirements Requirements for non-hazardous apply Electrical apparatus only to be used within their electrical ratings for power Hazardous areas divided in to Zones

• Documentation Area classification documents Instructions for erection and connection Documents for apparatus with special conditions marked with an “X”

Installation IEC 60079-14


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Installation IEC 60079-14 • Assurance of Conformity of Apparatus

Certification • Selection of Apparatus

Specific information Selection according to Zones Selection according to Temperature Class Selection according to Apparatus Class External influences


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Check list - Apparatusis appropriate to area classificationexplosion group is correcttemperature class is correctdocumentation is completeno damageno inadmissable modificationsbolts, cable entries etc. complete and tightseals and gaskets satisfactoryelectrical connections are tightlamp ratings, type and position correctflameparths within max. values and clean "d"special conditions of use are complied with "i"


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Check list - InstallationCable and wiring as selectedCable and wiring earthed as requiredCable and wiring is not damagedCable entries correctly closedCable glands correctNo inadmissible bunching of cablesFulfilment of all special requirementsProper function of all protective devices Installation corresponds to documentationPotential equalization correctEletrostatic at safe levelLightning protection according to the rulesEmergency switch-off according to the rulesPurg time is sufficient ("p")


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Check list - InstallationElectrical circuits "e" and "i" separatedIngress protection sufficientMechanical protection sufficientThermal protection sufficientChemical protection sufficient


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Inspection and Maintenance IEC 60079-17 • Maintenance

to retain or restore to original spec. so to perform its correct function


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• Inspection - scrutiny with or without partial dismantling, and if necessary measurement to reach a conclusion on the condition of the apparatus

visual - inspection which identifies, without the use of access equipment or tools, those defects, such as missing bolts, which will be apparent to the eye close - aspects covered by a visual inspection and, in addition, identifies those defects, such as loose bolts, which will be apparent only by the use of access

equipment, for example steps, (where necessary), and tools


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• Inspection

detailed - aspects covered by a visual inspection and, in addition, identifies those defects, such as loose terminations, which will only be apparent by opening the enclosure, and/or using, where necessary, tools and test equipment

initial - inspection of all electrical apparatus, systems and installations before they are brought into service


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• Inspection

periodic - inspection of all electrical apparatus, systems and installations carried out on routine basis sample - inspection of a proportion of the electrical apparatus, systems and installations continuous supervision - frequent attendance, inspection, service, care and maintenance of the electrical installation by skilled personnel who have experience in the specific installation and its environment in order to maintain the explosion protection features of the installation in satisfactory condition


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• General requirements

documentation - area classification apparatus group and temperature class technical information, spares lists, manufacturers instructions etc. qualification of personnel - experienced and trained personnel, with knowledge of types of protection, installation practices, relevant rules and regulations. With evidence of relevant experience and training


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• Continuous supervision

Concept - where an installation is visited on a regular basis in the normal course of work by skilled personnel who are required to carry out visual and/or close inspections as part of their normal work schedule and detailed inspections as part of any replacement, repair, modification or adjustment Objective - continuous supervision is to enable the early detection of arising faults and their subsequent repair.


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• Continuous supervision

Responsibilities -

Technical persons with executive function Skilled personnel Frequency of inspection Documents Training


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• Maintenance requirements

Remedial measures and alterations maintain the integrity of the type of protection provided for the apparatus; this may require consultation with the manufacturer. Replacement parts shall be in accordance with the safety documentation. Alterations to apparatus shall not be carried out without appropriate authorization where they adversely affect the safety of the apparatus as stated in the safety documentation.


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Maintenance of flexible cables Flexible cables, flexible conduits and their terminations are particularly prone to damage. They shall be inspected at regular intervals and shall be replaced if found to be damaged or defective.


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Withdrawal from service If it is necessary, for maintenance purposes, to withdraw apparatus, etc. from service, the exposed conductors shall be

a) correctly terminated in an appropriate enclosure, or b) isolated from all sources of power supply and insulated, or c) isolated from all sources of power supply and earthed.

If the apparatus is to be permanently withdrawn from service,

the associated wiring, which shall be isolated from all sources of power supply, shall be removed, or, alternatively,

correctly terminated in an appropriate enclosure.


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Fastenings and tools Where special bolts and other fastenings or special tools are required, these items shall be available and shall be used. Environmental conditions

Electrical apparatus in a hazardous area can be adversely affected by the environmental conditions in which it is used. Some of the key elements to consider are corrosion, ambient temperature, ultraviolet radiation, ingress of water, accumulation of dust or sand, mechanical effects and chemical attack.


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