the use of surfix cable in hazardous locations presentations/2012/the use... · the use of surfix...

THE USE OF SURFIX CABLE IN

HAZARDOUS LOCATIONSHAZARDOUS LOCATIONS

BY

WA DE BEER PR. ENG.

SA Explosion Prevention

TOPICS

• CONSTRUCTION OF SURFIX CABLE

• SPECIFICATION OF SURFIX CABLE

• Ex CABLE REQUIREMENTS• Ex CABLE REQUIREMENTS

General

Flameproof

Increased safety

Intrinsic safety

Topics (continue)

APPLICABILITY OF SURFIX CABLE IN Ex

ENVIRONMENTS

General

FlameproofFlameproof

Increased safety

Intrinsic safety

CONCLUSION

Construction of surfix cable

Solid cores for smaller cross section

Outer sheath may be black or white

May have aluminium foil as a screen

Outer sheath

Solid cores

Outer sheath

Screen – Al foil

Surfix construction

Cores are colour coded

Earth is not insulated

Earth and phase conductors not same Earth and phase conductors not same

cross section

Surfix construction

Also available in flat configuration

(Norsk)

Surfix constructionMay have cavities between cores

Earth conductor is not insulated

Cavities

Surfix Specifications

• Voltage rating : 300V or 500V

• Cross section : eg: phase 1,5; 2,5 4, 6mm2• Cross section : eg: phase 1,5; 2,5 4, 6mm2

earth 1,0; 1,5; 1,5 2,5mm2

Conductors larger than 2,5mm are usually

stranded

Cable requirements for Ex

applications

A) General

1) (SANS 60079-0)

Clause 15.3 Table 9: Clause 15.3 Table 9:

Cross section of conductors (S mm2):

Searth = Sphase


applications

General (continue)

2) SANS 10086-1, clause 4.6.2.2

Earth conductor shall be similarly insulated

than phase conductors.


applications

General (continue)

3) SANS 10086-1 clause 4.6.2.4

Fire –retardance

The outer sheath shall be fire

retardant


applications

General (continue)

4) SANS 10086-2, clause 9.4.3.5 –VSD’s

Use symmetrical multicore cables

Earth cond.Earth cond.


applications

General (continue)

5 SANS 10086-2 Clause 9.6.8

Mobile machinery control cables

a) Multi stranded conductors a) Multi stranded conductors

b) Cores collectively screened

c) Fire retardant, resistant to abrasion and

oils


applications

General (continue)

6 SANS SANS/IEC 60079-14

Clause 9.1.1 : Aluminium > 16mm2

Clause 9.1.4: Avoid “cold flow” –Clause 9.1.4: Avoid “cold flow” –

thermo-plastics

Clause 9.1.8 Avoid contact between

armmouring/screen and

pipework


applications

B Flameproof

1 SANS/IEC 60079-1

No requirements !


applications

B Flameproof (continue)

2 SANS/IEC 60079-14

Clause 10.4.2 Cable entry devices and cable :

IF cable is substantially compact, circular and IF cable is substantially compact, circular and have an extruded bedding :

Entry device with sealing ring – OK,

or......


applications


2 SANS/IEC 60079-14


or......or......

cable circular, compact and has extruded

bedding, but internal source of ignition, not

zone 1, not IIC and < 2l, then:

entry device with a sealing ring OK, else..


applications


2 SANS/IEC 60079-14


...else ...else

stopping box or compound seal

Individual cores


applications


3 SANS 10086-1

No cable requirements

4 SANS 10086-2


Cable requirements for Ex applications

C Increased safety

1 SANS IEC 60079-7



applications

C Increased safety

2 SANS 60079-14

Clause 11.3.2Clause 11.3.2

Cable and cable entry devices must maintain

IP54 rating

Applicability of surfix in ex

environments

C Increased safety (continue)

3 SANS 10086-1



applications


4 SANS 10086-2


Cable requirements for EX applications

D Intrinsic safety

1 SANS/IEC 60079-11


CABLE REQUIREMENTS FOR eX

APPLICATIONS

D Intrinsic safety

2 SANS/IEC 60079-14

Clause 12.2.2.1

Cable insulation: ≥ 500VAC or 750VDC

Conductor diameter : ≥ 0,1mm (≥0,01mm2)

CABLE REQUIREMENTS FOR eX

APPLICATIONS

D Intrinsic safety (continue)

3 SANS 10086-1

Clause 8.2.2.6.1 Clause 8.2.2.6.1

Insulation thickness ≥0,2mm

Clause 8.2.2.6.2

Dielectric strength ≥500/1000VAC

Cable requirements for ex applications


4 SANS 10086-2

Clause 8.1.7

Insulation to earth ≥ 500VACInsulation to earth ≥ 500VAC

Insulation to non IS ≥ 1500VAC

APPLICABILITY OF Surfix cable in eX

applications

A General

1) (SANS 60079-0)

Clause 15.3 Table 9:

Cross section of conductors (S mm2):

S = SSearth = Sphase

Surfix : Searth ≤ Sphase

APPLICABILITY OF SURFIX IN Ex

applications

General (continue)

2) SANS 10086-1, clause 4.6.2.2

Earth conductor shall be similarly insulated than phase conductors.

Surfix : Earth conductor not insulated


applications

General (continue)

3) SANS 10086-1 clause 4.6.2.4

Fire –retardance

The outer sheath shall be fire

retardant

Surfix : Not fire retardant


applications

General (continue)

4) SANS 10086-2, clause 9.4.3.5 –VSD’s

Use symmetrical multicore cables

Earth cond.

Surfix : Not symetrical

Earth cond.

Applicability of surfix in Ex

applications

General (continue)

5 SANS 10086-2 Clause 9.6.8

Mobile machinery control cables

a) Multi stranded conductors a) Multi stranded conductors

b) Cores collectively screened

c) Fire retardant, resistant to abrasion and oils

Surfix : a + c : Not comply

b : Comply


applicationsGeneral (continue)

6 SANS SANS/IEC 60079-14

a) Clause 9.1.1 : Aluminium > 16mm2

b) Clause 9.1.4: Avoid “cold flow” –

thermo-plasticsthermo-plastics

c) Clause 9.1.8 Avoid contact between

armmouring/screen and

pipework

Surfix : a : Not applicable

b : Not comply

C: Comply


environmentsB Flameproof

1 SANS/IEC 60079-1

No requirements !

Surfix : May be used

Applicabikity of surfix in Ex

Environments


2 SANS/IEC 60079-14


IF cable is substantially compact, circular and IF cable is substantially compact, circular and have an extruded bedding :

Entry device with sealing ring – OK,

Surfix : May be used ??


environments


2 SANS/IEC 60079-14


or......or......

cable circular, compact and has extruded bedding, but

internal source of ignition, not zone 1, not IIC and < 2l,

then:

entry device with a sealing ring OK, else..

Surfix : May be used ??


environments


2 SANS/IEC 60079-14


...else (cable circular, compact and has extruded bedding, but ...else (cable circular, compact and has extruded bedding, but

internal ignition, Zone 1, IIC and > 2l, then stopping box or

compound seal

Individual cores

Surfix : Can definitely be used


environments


3 SANS 10086-1


Surfix : May be usedSurfix : May be used

4 SANS 10086-2




environments

C Increased safety

1 SANS IEC 60079-7




environmentsC Increased safety

2 SANS 60079-14

Clause 11.3.2

Cable and cable entry devices must maintain Cable and cable entry devices must maintain

IP54 rating

Surfix : May be used ?


environments


3 SANS 10086-1




environments


4 SANS 10086-2




environments

D Intrinsic safety

1 SANS/IEC 60079-11



Applicability of surfix in ex environments

D Intrinsic safety

2 SANS/IEC 60079-14

Clause 12.2.2.1

Cable insulation: ≥ 500VAC or 750VDCCable insulation: ≥ 500VAC or 750VDC

Conductor diameter : ≥ 0,1mm (≥0,01mm2)

Surfix : Not suitable


environments


3 SANS 10086-1

Clause 8.2.2.6.1

Insulation thickness ≥0,2mmInsulation thickness ≥0,2mm

Clause 8.2.2.6.2

Dielectric strength ≥500/1000VAC



environments


4 SANS 10086-2

Clause 8.1.7

Insulation to earth ≥ 500VACInsulation to earth ≥ 500VAC

Insulation to non IS ≥ 1500VAC


the use of surfix in hazardous

environments

Conclusion

Flameproof : Not comply (79-0)

Increased safety : Not comply

Intrinsic safety : Not suitable

the use of surfix cable in hazardous locations presentations/2012/the use... · the use of surfix...

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