Protective Conductor Cross Sectional Area
(BS 7671/ IEE Wiring Regulations 17th Edition)
Use 543.1.1 or 543.1.4 for size (543.1.3 is manatory if short circuit considered in main cable size). Mimium
size 2.5 mm
2 if mechanically protected and 4 mm
2 if not. Use most
onerous fault current/operating time and largest line conductor csa.
| Line Conductor: |
Material
|
Insulation
|
Initial Temperture: 70 oC
Final Temerature: 160 oC
|
Protective Conductor:
|
Material
|
Insulation
|
Initial Temperture: 30 oC
Final Temerature: 160 oC
|
Regulation 543.1.3 (adiabatic equation, disconnection time not exceeding 5 s )
Mimimum Protective Conductor Size:
134 mm
2
Regulation 543.1.4 (relation to phase conductor, disconnection time not exceeding 5 s)
Protective conductor same material as associated line conductor
Minimum Protective Conductor Size:
16 mm
2
Regulation 543.1.4 (relation to phase conductor, disconnection time not exceeding 5 s)
Protective conductor not same material as associated line conductor
Mimimum Protective Conductor Size:
13 mm
2
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