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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 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
Cable requirements for Ex
applications
General (continue)
2) SANS 10086-1, clause 4.6.2.2
Earth conductor shall be similarly insulated
than phase conductors.
Cable requirements for Ex
applications
General (continue)
3) SANS 10086-1 clause 4.6.2.4
Fire –retardance
The outer sheath shall be fire
retardant
Cable requirements for Ex
applications
General (continue)
4) SANS 10086-2, clause 9.4.3.5 –VSD’s
Use symmetrical multicore cables
Earth cond.Earth cond.
Cable requirements for 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
Cable requirements for Ex
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
Cable requirements for Ex
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......
Cable requirements for Ex
applications
B Flameproof (continue)
2 SANS/IEC 60079-14
Clause 10.4.2 Cable entry devices and cable :
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..
Cable requirements for Ex
applications
B Flameproof (continue)
2 SANS/IEC 60079-14
Clause 10.4.2 Cable entry devices and cable :
...else ...else
stopping box or compound seal
Individual cores
Cable requirements for Ex
applications
B Flameproof (continue)
3 SANS 10086-1
No cable requirements
4 SANS 10086-2
No cable requirements
Cable requirements for Ex
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
No cable requirements
Cable requirements for Ex
applications
C Increased safety (continue)
4 SANS 10086-2
No cable requirements
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
D Intrinsic safety (continue)
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
APPLICABILITY OF SURFIX IN Ex
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
APPLICABILITY OF SURFIX IN Ex
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
Applicability of surfix in Ex
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
Applicability of surfix in Ex
environmentsB Flameproof
1 SANS/IEC 60079-1
No requirements !
Surfix : May be used
Applicabikity of surfix in Ex
Environments
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,
Surfix : May be used ??
Applicability of surfix in ex
environments
B Flameproof (continue)
2 SANS/IEC 60079-14
Clause 10.4.2 Cable entry devices and cable :
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 ??
Applicability of surfix in ex
environments
B Flameproof (continue)
2 SANS/IEC 60079-14
Clause 10.4.2 Cable entry devices and cable :
...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
Applicability of surfix in ex
environments
B Flameproof (continue)
3 SANS 10086-1
No cable requirements
Surfix : May be usedSurfix : May be used
4 SANS 10086-2
No cable requirements
Surfix : May be used
Applicability of surfix in ex
environments
C Increased safety
1 SANS IEC 60079-7
No cable requirements
Surfix : May be used
Applicability of surfix in ex
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 ?
Applicability of surfix in ex
environments
C Increased safety (continue)
3 SANS 10086-1
No cable requirements
Surfix : May be used
Applicability of surfix in ex
environments
C Increased safety (continue)
4 SANS 10086-2
No cable requirements
Surfix : May be used
Applicability of surfix in ex
environments
D Intrinsic safety
1 SANS/IEC 60079-11
No cable requirements
Surfix : May be used
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
Applicability of surfix in ex
environments
D Intrinsic safety (continue)
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
Surfix : Not suitable
Applicability of surfix in ex
environments
D Intrinsic safety (continue)
4 SANS 10086-2
Clause 8.1.7
Insulation to earth ≥ 500VACInsulation to earth ≥ 500VAC
Insulation to non IS ≥ 1500VAC
Surfix : Not suitable
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