IEC standard LV Power Cable - Industry Trends and Best Practices

Construction

(1) Conductors

The conductors are either of Class 1 or Class 2 of plain or metal-coated annealed copper or of plain aluminium or aluminium alloy, or of Class 5 of plain or metal-coated copper in accordance with IEC 60228. [https://www.lindecable.com/iec-standard-lv-power-cable-product/]

(2) Insulation

XLPE or Polyvinyl chloride(PVC)

(3) Sheath

Polyvinyl chloride(PVC) or polyethylene or Halogen free

(4) The constructions of inner coveringsfillers and metal layers have multiple choices depending on the customer needs.

Insulating compounds

Insulating compound
Abbreviated designation

b)
Thermoplastic

Polyvinyl chloride intended for cables with rated voltages Uo/Us 1,8/3 kV
PVC/A a

Cross-linked:

Ethylene propylene rubber or similar(EPM or EPDM)
EPR

High modulus or hard grade ethylene propylene rubber
HEPR

Cross-linked polyethylene
XLPE

Insulating compound based on polyvinyl chloride intended for cables with rated AC voltages Ua/U =3,6/6 kV designated PVC/B in IEC 60502-2.

Maximum conductor temperatures for different types of insulating compound

Insulating compound
Maximum conductor temperature degrees C

Normal operation
Short-circuit (5s maximum duration)

Polyvinyl chloride
/A

Conductor cross-section less than or equal to 300 mm2
70
160

Conductor cross-section 300 mm2
70
140

Cross-linked polyethylene

90
250

Ethylene propylene rubber
EPRand
90
250

Nominal thickness of PVCIA insulation

Nominal cross-sectional area of conductor mm2
Nominal thickness of insulation at rated voltage Uol U(Um)

0.6/1(1.2)kVmm
1.8/3(3.6)kVmm

1.5 and 2.5
0.8

4 and 6
1.0

10 and 16
1.0
2.2

25 and 35
1.2
2.2

50 and 70
1.4
2.2

95 and 120
1.6
2.2

150
1.8
2.2

185
2.0
2.2

240
2.2
2.2

300
2.4
2.4

400
2.6
2.6

500 to 800
2.8
2.8

1000
3.0
3.0

Nominal thickness of cross-linked polyethylene (XLPE) insulation

Nominal cross-sectional area of conductor mm2
Nominal thickness of insulation at rated voltage Uol U(Um)

0.6/1(1.2)kVmm
1.8/3(3.6)kVmm

1.5 and 2.5
0.7

4 and 6
0.7

10 and 16
0.7
2.0

25 and 35
0.9
2.0

50
1.0
2.0

70 and 95
1.1
2.0

120
1.2
2.0

150
1.4
2.0

185
1.6
2.0

240
1.7
2.0

300
1.8
2.0

400
2.0
2.0

500
2.2
2.2

630
2.4
2.4

800
2.6
2.6

1000
2.8
2.8

Sheathing compounds and maximum conductor temperatures for different types of sheathing compound

Sheathing compounds
Abbreviated designation
Maximum conductor temperaturein normal operation degrees C

a
Thermoplastic:

Polyvinyl chloride(PVC)
ST1
80

ST2
90

Polyethylene
ST3
80

ST7
90

Halogen free
STs
90

b
Elastomeric:

Polychloroprene chlorosulfonated polyethylene or similar polymers
SE1
85

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