KOC-E-004 Part-5

7/25/2019 KOC-E-004 Part-5

http://slidepdf.com/reader/full/koc-e-004-part-5 1/19

E.l.J)

c.r_éll

-hJii

aJr-l

KUWAIT

OrL

COMPANY

K.S.C.)

STANDARDS

PUBLICATTON

KOC RECOMMENDED

PRACTTCE

FOR

SELECTIONO

INSTALLATION

AND

MAINTENAI\CE

OF

ELECTRICAL

EQUIPMENT

IN

HAZARDOUS

AREAS

NON-SPARKING

TYPE Ex

?n)

DOC

NO:

KOC-E-004

Part

5

STANDARDS TEAM

W

7/25/2019 KOC-E-004 Part-5


(fJ.l.J)

c.¿;l3ll

-hJi¡

eS-r

KtIWArr

OIL

COMPANY

(K.S.C.)

STANDARDS

PUBLICATION

KOC

RECOMMEI\{DED

PRACTICE

F OR

SELECTION,

INSTALLATION

AI\D

MAINTENANCE

OF

ELECTRICAL

EQUIPMENT

IN

HAZARDOUS

AREAS

NON-SPARKING

TYPE

Ex n)

DOC

NO:

KOC-E-004

Part

5

ISSUING

AUTHORITY:

I

R

/

STANDARDS

TEAM

DOC.

NO.

KOC-E-OO4

Pt. 5

Page

1

of

18

REV.

2

7/25/2019 KOC-E-004 Part-5


20/01/96

2

Dr. M.

llyas

ssued

as KOC

Recommended

Practice

\

Amended

Cl.

7.5

1106/2008

ffi@

. Unn¡krlshnan

ask Force

(TF-EE/08)

KOC

RECOMMENDED

PRACTICE

FOR

SELECTION,

INSTALLATION

AND MAINTENANCE

OF ELECTRICAL

EQUIPMENT

IN HAZARDOUS AREAS

NON-SPARKING

TYPE

Ex n

DOC

l\O. KOC-E-004

Part 5

REV.

2

age2

of

18

OC.

NO.

KOC-E-004

Pt.

5

7/25/2019 KOC-E-004 Part-5


2

Þ

Ë

TABLE

OF

CONTENTS

PAGE

NO.

1.

2.

3.

4.

5.

6.

7.

8.

9.

scoPE

4

APPL'CATION

4

TERIIIINOLOGY

5

REFERENCE

CODES

AND

STANDARDS

6

ENVIRONMENTAL

CONDITIONS

8

SERVTCE

CONDIT]ONS

I

CONSTRUCTIONAL

REQUIREMENTS

8

INSTALLATION

REQUIREMENTS

11

INSPECTION,

MAINTENANCE

AND

TESTING

I3

QUALIW

ASSURANCE

14

MARKING

14

DOCUÍTIENTATION

l5

SPARE

PARTS

fIiAINTENANCE

DATA

16

APFENDIX

-

A

INSPECTION

SCHEDULE

FOR

Ex'N'

or

EEx'n'

17

10.

11.

12.

13.

14.

DOC.

NO.

KOC-E-OO4

Pr. 5

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IttE

1.0

scoPE

1.1

1.2

This

part

of

the Recommended

Practice

describes

the

specific

requiremenùs

for

construction,

assessment,

testing

and marking

of

rotating

electrical

machines

with type'n'

protection.

It

also

gives

the requirements

for

fixed

luminaries with type

'n'

protection.

2.O

APPLICATION

2.1

All

equipment

with

type 'n'

protection

whether

rotating

or fixed

are

useful

for Zone

2

only

and

these shall

conform to the requirement

of

this document.

2.2 This

Recommended

Practice

(RP)

covers

those

items of equipment

identified

as

Ex'n' including

all

categories

Ex'nA',

Ex'nC'and

Ex'nR',

The

British

Standards

use Ex'N'and

the

European

Norms

use

Ex'n'.

The

equipment

identified

with

small or

capital

letter

('n N')

and

with

additional

letter'E'

or'e'

are

equally

regarded-

2.3

This

document

is issued

in

the following

six

parts:

ParLl

Recommended

Practice

for

Selection,

lnstallation

and

Maintenance

of

Eleotrical

Equipment

in

Hazardous

Areas:

General Requirements.

Parl2

Recommended

Practice

for

Selection,

lnstallation

and

Maintenance

of

Electrical

Equiprnent

in

Hazardous

Areas:

Flameproof

Enclosure

rd'.

Part

3

Recommended

Practice

for Selection,

lnstallation

and

Maintenance

of

Electrical

Eguipment

in Hazardous

Areas:

lntrinsic

Safety'f.

Parl4

Recommended

Practice

for

Selection,

lnstallation

and

of

Electrical

Equipment

in

Hazardous

Areas:

lncreased

safety'e'

Part

5

Recommended

Practlce

for

gelectlon,

lnstallatlon

and

ilalntenance

of

Electrical

Egutpment

Ín

Hazardous

Areas:

Non'

sparking

tYPe

h'

egulPment-

Part

6

neãommended

Practice

for

Selection,

lnsta

of

Electrical

Equipment

in

Hazardous Areas:

Maintenance

tot

DOC.

NO.

KOC-E-OO4

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5

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3.0

TERM¡NOLOGY

3.1

Type

of

Protection

n

A

type

of

protection

applied

to

electrical

apparatus

such

that, in normal

operation,

it is

not

capable

of

igniting

a surrounding

explosive

gas

atmosphere

and

a

fault

capable

of causing

ignition

is

not likely to

occur.

3.2

NormalOperatioll

Electrical

apparatus

with

type of

protection

n

is

in normal operation

when

it

conforms

electrically

and mechanically

with

its

design

specification

and is

used

within

the limits specified

by the

manufacturer.

3.3

Enclosure

All

the

walls of external

casing

that

surround

the

live

parts

of

electrical

apparatus

including

doors,

covers,

cable

entries,

rods,

spindles

and

shafts.

3.4

3.5

Restricted

Breathlng

Enclosure

An

enclosure

that

is

designed

to

restrict

the entry

of

gases

and

vapours.

Enclosed

Bfeak

Device

A

device

that

incorporates electrical contacts

that

are

made and

broken,

and

that

will withstand

an internal

explosion

of flammable

gas

or

vapour

for

which

¡t

is

designed

without

suffering

damage

and

without

communicating

the

internal

explosion

to

the

corresponding

external

flammable

gas

orvapour.

3.6

Non-lncendive

Compon.ent

A

component,

other

than

an

making

and

breaking

a

Pote

enclosed-break

device

with

contacts

for

ntially

ince

ndive

circuit

where

e

ither

the

contacts,

or

the

contacti

ng

mechanism

or the

enclosure

n which

the

contacts are

housed

a

re so

constructed

that

the

component

igniti

on

of

the

prescribed

flamma

ble

gas

or

vapour

u

nde

r

spec

if¡

operating

conditions.

3.7

Sealed

Device

A

device

that

is

so

constructed

that

it

cannot

be

opened

during

normal

service

and

is

sealed

against

entry

of an

external

atmosphere.

3.8

Hermetlcally

SealeÛDevices

A

device

that

is so constructed

that

the

external

atmosphere

cannot

gain

âccess

to

the

interior

and

in

which

any

seal is

DOC.

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3.9

Enerqv

Limited Apparatus

and Circuits

Electrical

apparatus and

circuits

in

which

no

arc,

spark

or thermal

effect

is

capable

of

causing ignition

under

the

test

conditions

prescribed.

3.10 Stopping

Fox

A

device

to

restrict

the flow of a

gas

or liquid

between apparatus

and

a

conduit.

3.11

Creepage

distance

The

shortest distance

between

two

conductive

parts

along

the

surface

of an

electricalinsulating

material.

3.12

Glearance

The

shortest

distance through

the

air

between two

bare

conducting

parts.

3.13

MaximumSurfaceTempefature

The

highest

temperature attained

under

practical

conditions

of

operation

withÍn

the

rating

of apparatus

by any

part

of

any

surface

exposed

to

an

explosive atmosphere

that

may

involve

a

risk.

4.0

REFERENCE

CODES

AND

STANDARDS

4.1

ln the event

of conflict between

this Recommended

Practice

(RP)

and

the

Codes referenced

herein,

the

most

stringent

requirement

shall

apply,

unless

otherwise

specified.

Any

exceptions

or deviations

from

this

document,

along

with

their

mel¡ts

and

justifications,

shall

be

brought

to the attention

of KOC

Controlling

Department

for

their

review,

consideration

and

amendment by Standards

Team

(if

required).

4.3

A

list

of Codes

and

Standards

is

given

below

which

are

this

Recommended

Practice.

However,

the list

does

not

the

use

of

other

technical

source

of

information

provided

that

do notconflictwith

the listed

Standards.

4.4

coDEs,

STANDARQS

.

BS5000Part16

British

Standard specification

for

rotating

el

of

particular

type

or

for

particular

applications

protection N .

4.2

REV.

2

age

6

of

18

OC.

NO.

KOC-E-OO4

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þ

\\\

,Í

o

lnstallation

and

maintenance

requirements

for electrical

apparatus with type

of

protection'N'.

.

856941

Electrical

apparatusfor

explosive

atmospheres

with

type

of

protection'N'.

BSEN

60400

Specification

for

lampholders

for

tubular

fluorescent

lamps

and

starter

holders.

B EN

60529

Specification

for

Degrees

of

protection

provided

by enclosures

(lP

code).

tEc

79-15

Electrical

apparatus

for

explosive

gas

atmospheres

with

the

type

of

protection'n'.

a

a

a

a

a

a

a

a

BS

5345 Part

7

KOC-E-004

PBrll

&.2

KOC

Recommended

Practice

for

selection,

installation

and

rnaintenance

of

electrical

equipment

in

Hazardous

Areas.

(General Requirements)

and

(Flameproof

enclosure'd').

KOC-G-0q2

KOC

Standard

for

Hazardous

Area

Classification.

KOC-G-004

KOC

Standard

for

Packing,

Marking

and

Documentation.

KOC-G-0o7

KOC

Standardfor

Basic

Design

Data.

.

KO-C-G-009

KOC

Standard

for

SPare

Parts

and

DOC.

NO.

KOC-E-Oo4

Pr.

5

REV. 2

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2

,Í

o

Ct

e

R

5.0

ENVIRONMEI{TALCONDITIONS

5.1

The

environment

of

Kuwait,

is

severe

on

all equ¡pment

and must

be

considered

carefully

before procurement of plant

and

equipment.

lt

must

be assumed

that,

unless

otherwise

specified,

equipment

may

be

subjected

to sand

and

fine

particle

dust storms,

salt

laden

winds,

thunderstorms,

heavy

rains,

chemical

contaminants

and

extreme

temperatures.

5.2

KOC

Standard

for Basic

Design

Data,

KOC-G-007,

provides

the

detailed

design

information

regarding

the environmental,

site,

and

utility

supply

conditions

prevailing

throughoutthe

KOC

facilities.

6.0

SERVTCE

CONDlflgNq

6.1

All

materials

used

for

electrical

installation

shall

be

new

and

in all

respects

suitable

for continuous

operation

under

the

environmental

conditions.

6.2

Reliability

of

all

equipment

to

perform continuously

in

the

service

conditions

specified

is

essential.

Such

reliability

of

all components

shall

be substantiated

by

a

similar

component

in

operational

use

elsewhere

for

a

minimum

period

of

3

years.

6.9

All

constructional

material

shall

be of

high

quality

and

as

specified.

prototype or

unproven equipment not having

well established record

of satisfactory

service

shall

not

be

considered.

çONsTRUcTloN¿\L

REOUTREMENTS

7.1

Electrical

apparatus

with

the

type

of

protection

n

is

suítable

for use

in

Zone

2

onlY.

7.0

7.2

Eq

uipment

for use

n

Tone

2 sh

al

be sel

ected

n accordance

w¡th

th

e

criteria

of area

and temperature

classification

s

Part¡

cular

attention

shal

be

g

iven

to

the

need for

weather

protectíon, the ing

ress

iquids

partic

ulate

matter

co

rrosive

effect

of

solvents

a

nd

h

eat

7.3

adjacent

plants.

The

KOC-G-002

shall

be

referred

along

with

relevant

drawing

of

facility

for

hazardous

area

classification.

Only

certified

equipment

shall

be

setected

and

the

certification

shall

be

fãr

the

peak

amLienttemperature

also

marked

on

the

equipment

.4

DOC.

NO.

KOC-E-004

Pt.

5

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I

of

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}

7.5

Electrical

Equipment

in

Hazardous

Area- Certification

Bodies:

For

details

of

Certification

Bodies

(Electrical

Equipment

in

Hazardous

Area) acceptable

to

KOC,

refer

Clause

9.15

of

*KOC

Recommended

Practice

for

Selection,

lnstallation

and

Maintenance

of

Electrical

Equipment

in

Hazardous

Areas

-Flameproof

Enclosure

d (KOC-E-004

ParI2,

Rev.

2).

7.6

The

maximum

temperature

appropriate to

the

temperature

class shall

not exceed

the

ignition temperature

of

the

flammable

gas

or

vapour

expected

to

be

present

in

the

hazardous

area.

lf more than one

flammable

gas

or

vapour

is

present

in the area

then

the lowest

value

of

the

ignition temperature

shall

be

considered.

7.7 The

temperature

of any external

or

internal

surface

to

which

the

explosive

atmosphere

has

access

shall

not exceed

200 C

(temperature

class

T3).

Where

gases

or

vapour having

an

ignition

temperature

below

200 C,

temperature

class

T4,

T5

or

T6

shall

apply.

The

rating

plate

shall

be clearly

marked

for

this

fact by

the

manufacturer.

7.8

Where

a

motor is

started

at

number of

times

each

day on

a

regular

basis,

account

shall

be

taken

of

the

temperature

reached

during the

starting period

to

assess the

temperature class.

7.9

Rotating

electrical

machines

fitted

with terminal

boxes

including

removable

covers,

shall

maíntain

the degree

of

protection

not less

than

lP

54

in accordance

with

BSEN

60529.

7.10

Apparatus

covered

under

protection n shall not

in

normal

operation,

produce

an

arc or

spark

unless

the

operational

arc

or spark

is

prevented

from causing

ignition

to

an

explosive

atmosphere

by

means

of

an

enclosed-break

device;

or the

operational

arc or

spark has

insufficient

energy

to

cause

ignition

to a

hydrogen/air

gas

m

under specified

test

conditions;

or

the

operational

arc

or

occurs

in

hermetically

sealed

enclosure.

7.11

Where

a

pparatus

is

protected

by

two

or

more types

of

includ

ing

rNt

or

tfì

then

¡t shall

be

selected

according

to

apparatus

group.

ln

s

uc

h

cases

the certifi

cat¡on

shal

indicate

the

which

the

apparatus

can

be

used

e

C,

,f

o

ú

þ

Þ

gases

or

vapours

n

REV.

2

age 9 of

18

Ã

DOC.

NO. KOC-E-OO4

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ú

(,

7.12

Sealed

or

encapsulated devices

shall

be

so

constructed

that they

cannot

be

opened

in normal

service

and shall

be

provided,

where

necessary,

with

external

connections

(i.e.,

flying

leads

or

external

terminals).

7.13

Luminaries

shall comprise

either

a

restricted

breathing

enclosure

or

an enclosure

with a

degree of

protection

lP

54

or a

combination

of

both.

7.14

Restricted

breathing

luminaries

shall incorporate

a

suitable

sealing

ring

for

use

with

cable

entries.

7.'15

Portable

luminaries

and

other

apparatus

containing

light sources

shall comply with the relevant

requirements of

BS

6941.

T.'1.6

Where

reflectors

and

protective

guards

are

used on

the

luminaries,

the

rneans

of attachment

shall

not

impair

the

restrictive

breathing

properties

of such luminaries.

T.1T

The

lampholders

shall

be

either

of the

non-sparking

or

enclosed-

break

type,

besides

compfying

with

the

safety and

interchangeability

requirement.

T.1g

Hermetically

sealed

devices

shal

satisff

the

criteria

for

compliance

to

BS

6941.

7.,19

Enclosed-break

lampholders

shall

ineorporate

an

enclosure

to

prevent

ignition

of

surrounding

flammable

atmosphere

when

the

lamp

is inserted

or removed.

l.ZO

Non-sparking

lampholders

shall

be

preferred

which

are

constructed

so that

the

risk

of

arc,

spark

or

hot spot

capable

of

creating

an

ignition

hazard

during

normaluse

is minimized.

7.z',,

lf bayonet

non-sparking

lampholders

are

used,

it

shall

be ensu

that

they

incorporate sprung contacts

and

the

springs are

not

only

means

of

carrying

current.

7.22

Bayonet

lam

pholder

shall

be

of type

that

the move

ment

of the

lamp

does

lead

to sparking

under

conditions

of

vibration or

temperature

change.

The

lampholders

with

Edison

Screws

(Es)

may also

be

considered.

7.2g

Starters

shall

be

of the

type

in

which

the

contacts

are

enclosed

in

a

herrnetically

sealed

glass

bottle

inside

a metal

or

plastic

canister.

Starter

holders

shallbe

of

the

non-sparking

.24

the

safety and

interchangeability

shall

conform

to

Page

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,f

o

2

v

7.25 Both

starter

and holder

shall be mounted

within the

enclosure

in

such

a way

that the

assembly

is

adequately supported

to

prevent

movement under

the

conditions

of vibration.

The

contact shall

be

resilient

and

shall

provide

adequate

contact

pressure.

7.26

Luminaries

shall be

marked wíth

the lamp rating and

gas group

and

temperature

class.

They shall

be

provided

with warning

label

stating

DO

NOT

CHANGE

LAMP

WHEN

ENERGIZED .

8.0

INSTALLATIO-N

RESUIREMENTS

8.1

For

general

installation

recommendations,

refer

to

Part

I

of

this

document.

8.2

Metallic

conduit

systems

for

apparatus with

type

'n'

protection

should

be

installed in

accordance

with

the

recommendations

given

in

KOC-

E-004

Part

1.

8.3 Plastic

conduit

systems may

be

used

provided

it is

suitable for

particutar location

and it shall be

of

minimum

schedule 40.

Such

conduit

systems

shall

be

supported

throughout

their lengths'

Where

it

is

required

that

a

conduit

or

ducting

system is

used

in

conjunction

witlr

a restricted-breathing

enclosure.

The

conduit

seal

shall

be instatled

to

ensure

that requirements of

restricted

breathing

are

complied.

Metallic

ducting

and

trunking

shall be

adequately

bonded

throughout

its

length

and earthed.

Where

machines

are

provided

with

loose

leads,

sufficient

length

of

loose

leads

shall

be

provided

for future

re-connection

to

be

made.

lt

shall

be

ensured that

necessary

insulation,

specified

clearances

and

creepage

distances

are maintained.

For

rotating electrical

machines

operating

at

high

voltages'

boxes

including

removable

covers,

the cable

sealing

and

boxes

shallbe

made

of steel.

Fans,

fan

hoods,

ventilation

screens

etc.

shall

be

constructed,

and

fixed

so as

to

prevent

distortion

and

displacement

that

could

cause

impact,

sparking

orfriction

of

rotating

parts

against

stationary

parts.

For

all

types

of

cable

connection,

it shall

be

possible

to

remove

rotating

ãiectrical

machines

without

stressing

the

cable

or

breaking

any

cable

seal

provided.

8.4

8.5

8.6

8.7

8.8

8.9

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8.10

Connection

of cables to apparatus

shall

be

made

by means

of

cable

glands

suitable for the

cable size

and

the

environment

to

maintain

the

integrity

of

the

apparatus.

8.11

lf the

temperature

shall

exceed

70 C

at

the cable

or conduit entry

point

or

80oC

at

the branch

point

of conductors, then

a label shall

be

provided

on the outside

of the apparatus

as

a

guide

for

selection

of

cable

or conduit wiring

insulation

material.

8.12

Resilient

gasket

seals

shall be

positioned

so

that they

are not subject

to

mechanical

damage

under

normal operating

conditions

and

they

shall

retain

their

sealing

properties

over

the

expected

life

of

the

device.

8.13

Where required,

soft,

seal washers shall be used between the

gland

body

and

the apparatus

to

ensure

the

degree

of

protection

of

the

terminal

enclosure.

8.14

Connection

of conductors

to

the

apparatus

termínals

shall

be

made

in

accordance

with

the manufacturer s

recommendations.

8.15

Unless

permitted

by

the documents,

two

conductors

of different

cross

sections should

not

be

connected

into

one

terminal.

4.16

Conductors

shall be

terminated

using crimp

type

terminals.

Correct

sized crimped terminals shall

be

used.

Conductor cross section

and

required

current

ratings

shall

be

maintained-

g.1T

When

the

cable sealing

and dividing

box is filled

with

compound, the

clearances

and

creepage

distances

shall

comply

with

BS 5000 Part

16.

8.19

Unused

cable

entries

shall

be

closed with

suitable

plugs

that

maintain

the

degree

of

protection.

g.1g

Fuse

links

shall

be

considered

non-sparking

devices

if

they are non-

rewirable

or

non-indicating

cartridge

type

operating

within

their

8.24

rating.

Fuse-link

operated

at

greater than

60V

shall

be

mounted

in non-

sparking

enclosed

holders.

Fuse

link

operated

at

60V

or

less

shall be

mounted

in

non-sparking

enclosed

holders,

non-sparking

spring

holders

or

soldered

in

Place-

Correct

type

and

value

for

replacement

fuses

shall

be shown

adjacent

io

the

fuse

holders,

unless

the

fuses

are of

a non-

interchangeable

tYPe.

8.21

8.22

Enclosure

shall

be

capable

of

withstanding

assembly

operation

without

damage

to

seals

and

REV.2

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2

e

8.23

Enclosure containing fuses

shall

either

be

interlocked

so that

insertion or

removal

of

replacement elements

can be

carried out

only

with the supply

disconnected

or

the enclosure

shall carry

a

warning label

DO

NOT

REMOVE FUSE

WHEN ENERGIZED .

9.0

|NSPECTION.

IUAINTENANCE ANp

TESTING

To

minimize

the risk

of

ignition

by electrical

installation & equipment

in

Zone 2, an

efficient

inspection,

maintenance

and

testing

of equipment

and

systems

is

essential.

The

general

recommendations

for inspection,

maintenance

and testing

are

given

in Part

1 of

this

document

and

apply

equally

to

this

part.

lf

at

any time

there is a

change

in

area

classífication,

or

in

the

characteristics

of

the

flammable

material used

in

the

area,

or

if

the

apparatus

is moved from one

location

to

another,

a

check

should

be made

to

ensure

that

the

apparatus

has

the

correct

temperature

class,

group

and

continues

to comply with the

area

classification.

9.4

The

apparatus,

system

and

installation

shall

be

inspected

regularly in

accordance

with the relevant

items

in the detailed

'D'

(*

=

lnitial)

column

of

the

inspection

schedule,

given

in

Appendix

A.

9.1

9.2

9.3

9.5

9.6

9.7

9.8

Periodic

inspection

shall

be

carried out at

least

once

every

two

years.

More frequent

inspections

may

be

justified

when

the equipment

is

operating

under

corrosive

atmosphere

or

subject

to

excessive

temperature,

vibration

etc,.

The results

of

all

inspection

shall be

recorded

so

that

review

of

inspection

frequencíes

is effective.

No alteration

shall be

made

to apparatus

with 'n'type

protection

without

appropriate

approval.

Failure

to this might

invalidate

the

certificate

or

other document

relating

to the

safety

of

apparatus.

lf an

enclosed-break

device

is

known

to be

faulty

or

is

suspected

being

faulty,

the

device

shall be

discarded

areas.

lt

shall

be rePlaced

bY

a

new

design

and

characteristics.

from

further

service

ín

hazardous

certified

component

of equiva

Enclosed-break

devices

and

non-incendive

parts shall be subject

to

type test

in

accordance

with

BS

6941.

The

rating

of

e

devices

shall

be

limited

to

a maximum

rating

of

660V

and

154. The

incendive

parts

shall

be

limited

to

a

maximum

rating

of 250V

and

154.

g.g

Under

no

circumstances

an

enclosed-break

device

shall

be

repaired

or

renovated

for

further

service

in

hazardous

areas'

g.10

Rotating

machines

shall

be

maintained

in

accordance

with BS

5000

Part

16.

REV.2

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of

18

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9.11

Where

there

is a requirement

for

working

on

apparatus

in the

energized

condition

(i.e.,

for

disconnecting,

maintenance, adjustment

or

testing)

provided

the

work

consists

of

minor routine

external

adjustments,

a

special

"work

permit" shall

be

obtained

certiffing that

the

area

is free

from flammable

gases

or vapours.

9.12

lf the work is

performed

on

or near de-energized

circuit

or equipment

where a

power

supply

could

be restored

inadvertently,

the lock

out-

tag out

procedure

shall

be

followed.

9.13

Where

practicable,

replacement

parts

and

fittings

should

be certified

or

approved

in

accordance

with'n'type

protection.

1O.O QUALITY

ASSURANCE

The

manufacturer

shall operate

a

quality

system

to

ensure

that

the

requirements

of

this

Standard

are

achieved.

The

quality

system

shall

preferably

be

based

on

ISO

9000

series

of

standards

and the

manufacturer

shall

demonstrate

compliance

by

providing

a

copy

of

the accredited

certificate

or

the

manufacturer's

quality

manual.

Verification

of the

manufacturer's

quality

system

is normally

part

of the

pre-qualification

procedure, and

is

therefore

not

detailed

in

the

core

text

of this

Standard.

11.0

MARKING

,11.1

Typical marking requirements

are

detailed in

KOC-E-004

Part

1.

The

apparatus

with

the type

of

protection'n'shall

be

permanently

marked

to

indicate

thefollowing

particulars

as

minimum.

.

ldentification

of

the manufacturer.

'

The

type

designation

of

the

apparatus.

.

The

number

of

the

relevant

certification

standard.

a

ldentification

of

the

type

of

protection

by

symbol:

Ex'nA

for

non-sparking

apparatus

Ex'nC'

for

sparking

apparatus

in

which

the contacts

are

protected

other

than

by restri

cted

breathing

enc

Ex'nR'

-

for

restricted

breathing

enclosure-

The

group symbol:

l

A,

ll

B or

ll G.

lf

the

apparatus

is

for

a

parüõuhi

gás

or

vapour

then

the

symbol

ll

shall

be

followed

by

the

name

or

chemicalformula

of

the

gas

or

vapour.

a

The

number

of the

certificate

and

the

issuing

a

Maximum

surface

temperature

in

degrees

Page

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a

a

The

symbol

x,

if there

are

any

special

conditions

of installation

and

use

relevant

to the

safety.

This

shall

be

specified

in the

documents

of the

apparatus.

For luminaries,

the word

restricted

breathing

where applicable.

11.2

On

very

small electrical

apparatus

where

there

is limited

space,

the

marking

may be

reduced

but

it

shall require

at least,

The

symbol

Ex'n'together

with

A,

C

or

R.

The

name

or symbol

of

the certifuing

authority

and

the number

of

certificate.

.

The

symbolx,

if

apPlicable.

'

The

group

sYmbol.

.

The

temperature

class

or

maximum

surface

temperature.

.

The

name

or registered

trade

mark of

the

manufacturer.

11.3

For

other

detailed

information

on Packing,

Marking

and

Documentation,

refer

to

KOC-G-004.

12.0

DocuilENTATlON

12.1

All correspondence,

drawings,

instructions,

data

sheets,

design

calculations,

or

any

other

written

information

shall

be in

the

English

language.

1Z.Z

All

dimensions,

units

of

measurement,

physical

constants,

etc.

shall

be

in

Sl units,

unless

otherwise

specified-

,,2.g

The

following

documents

shall

be

obtained

from

the manufacturer:

r

I

certificate

fortype'n'issued

by an

appropriate

organization.

.

flllanufacturer's

claim

of

compliance

with

the

relevantstandard-

Apparatus

descriPtion.

Marking

and

any

other

information

normally

required

for

electrical

apparatus.

Additional

conditions,

if

any,

for

the

safe

installation

and

use

of

apparatus.

a

a

a

a

DOC.

NO.

KOC-E-Oo4

Pt. 5

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z

,f

û

ÉR

12.4

Type

test certificates

for

the following

parts

of

the

apparatus

shall

be

obtained:

.

Enclosed-breakdevices.

.

Non-incendivecomponents.

.

Sealed,

hermetically

sealed

and

encapsulated

devices.

.

Energy

limited

apparatus

and

circuits.

.

Restricted-breathing

enclosures.

.

Screw lamp

holders.

13.0 SPARE

PARTS

MAINTENANCE

qArA

Refer

to

KOC

Standard

for

Spare

Parts

Maintenance

Data, KOC'G-009.

Page

16

of

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OC. NCI.

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5.

lnlegrity

of

condult

rYstem

and Inter{aoewlth

mlxad

sYetem

ls

o

4.

boxes and

oable

boxee ara

correctlyf,lled.

toppor

3.

a

Seallng of

trunklng,

ducts'

PlPea

andlor

condults

is

satisfúotory.

a

2.

a

There

is no

obviou¡

damege

to

cablee.

1

B.

I

tNsTALLêTION

Tyæ

of

cebls

ls approprlats.

15.

a

Motor

fans have

sufrclent

clearanoe to

encloaure

andlor

covers.

14.

Re¡trlcted

breathing

enclosure

ls satiefiactory.

O

13.

a

Enolo¡ed

-

break

and

hermetlcally

sealed

devlces

ara

undamaged.

12.

a

Condltione

of enclosure

ga¡ksts

ls oatlsfactory

11.

Electrical connðctlons

are

tlght

t0.

Lamp

ratlng,

type

and

poaltlon

are

correct

-visual check

9.

Bolts,

cable entry

devices

(dlreot

and lndlrect)

and

blanking

elements are

of

the

correcttype

and are

complete and

tight

-

pfrysical

check

8.

a

There

are

no

vlslble

unauthorlzed modllications.

7.

I

There

are

no

unauthorized modiflcatlons.

6.

a

Enclosure,

glasses

and

glass

to metal

sealing

gaskets

andlor compounds

are

satisfactory.

5.

a

Apparatus

clrcult

ldentlficât¡on

ls

avallable.

4 Apparatus

clrcult

identiffcation

is correcL

3.

a

Apparatus

temperature

class is

correct.

2.

D

Apparatus

group

is correcl

1

A.

a

APPARATUS

Apparatus

ls approprlats

to area class¡flcat¡on.

*

v

ff

c

*

D

Grade

of

lnspection

heck

that:

APPENDIX A

INSPECTION

SCHEDULE

FOR

Ex'N'or

EEx'n'

Legend:

D

=

Detailed,

Q

=

Glose, V

=

Vlsual,'=Applicable

*=lnltial

=Periodic

REV.

2

age

17 of

'18

OC. NO.

KOC-E-OO4

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7-

TL

o

o

e

RN4

APPENDIX A contd..

INSPECTION

SCHEDULE

FOR

Ex N or

EEx n

Legend:

D

=

Detailed,

C

=

Close,

V=

Visual,.

=Applicable

*=lnitial

*=Periodic

Electrlcallngulatlon

ls clean and

dry.

.

a

No

undueaccumulation

of dustand dlrt.

.

a

ENVIRONTIENT

Apparatus

ls adequately

protected

againstcorroslon,

weather,

vibratlon

and

other adverse

factore.

c.

1

Special condltions

of lnstallat¡on and uss are complied

with

(if

applicable).1.

Automatlo

etectrical

protective

devlces

are

set correctl¡1.

0.

Automatic

electrical

protective

devlceg

operate within

permlttsd

lim¡ts.

.

lnsulation

reslstance

is salirfactory.

.

Fault

loop impedance

(TN

¡ystsms)

or earthlng

reslstance

(lT

systems) is

satisfactory.

7

INSTALI-ATION

oo¡td..

Earthlng

connectlons,

lncludlng

any

supplementary

earthing

bondlng

connections are satlsfactory

(e.9.,

connections

are

tight

and

conduotors

are

of

sumcient

cross aection).

-

physlcal

ohech

-vlsual

chsok

B.

6.

*t

v

*

c

*

D

Check

that:

Grade

of

lnspection

REV.

2

age

18

of

18

OC.

NO.

KOC-E-OO4 ft. 5

KOC-E-004 Part-5

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