26 Juni Inspection and Maintenance Electrical

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CEAG Sicherheitstechnik GmbHInst & Maint 250804.ppt/01.08.2002/Eg/ Page 2

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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 condit ions

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 l ist - Apparatus

is appropriate to area classification

explosion group is correct

temperature class is correct

documentation is complete

no damage

no inadmissable modifications

bolts, cable entries etc. complete and tight

seals and gaskets satisfactoryelectrical connections are tight

lamp ratings, type and posit ion correct

flameparths within max. values and clean "d"

special conditions of use are complied with " i"


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Check l ist - Installation

Cable and wiring as selected

Cable and wiring earthed as required

Cable and wiring is not damaged

Cable entries correctly closed

Cable glands correct

No inadmissible bunching of cables

Fulfi lment of all special requirements

Proper function of all protective devicesInstallation corresponds to documentation

Potential equalization correct

Eletrostatic at safe level

Lightning protection according to the rules

Emergency switch-off according to the rules

Purg time is sufficient ("p")


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Check l ist - Installation

Electrical circui ts "e" and " i" separated

Ingress protection sufficient

Mechanical protection sufficient

Thermal protection suff icient

Chemical protection suff icient


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Inspection and MaintenanceIEC 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, identif ies 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

init ial - 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 proport ion 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 specif ic

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. qualif ication 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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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 f lexible 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 adverselyaffected 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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