Handbook of Electrical Engineering

200 HANDBOOK OF ELECTRICAL ENGINEERING

also the IEE Wiring Regulations in its sixteenth form. Such tables cover a wide range of installation
configurations and environmental conditions, not all of which are applicable in the oil industry.
The following tables were compiled to be on similar bases and for installations commonly used in
the oil industry. For example all the reactance data are given for a frequency of 50 Hz. The con-
ductor temperatures are those suitable for the insulation where rated current follows in the cable.
The resistance data of the armouring has been given at a temperature of 80◦C for wire armour-
ing and 60◦C for braided armouring so that the earth loop impedance can be calculated under
fault conditions. The depth of burial of cables is taken to the 0.5 m and the ground temperature
15 ◦C. They should be used as guidance in estimating cable sizes. When calculations are being
finalised for a project then the data from a particular manufacturer should be used. Most of the
data presented were kindly made available by the Anixter Wire and Cable group of companies,
see Reference 6. Reference 4 also provides comprehensive data on many types of cables, and was
used as a source for PVC insulated cables. Reference 7 although somewhat dated is also a valuable
source of data.

Table 9.11. Summary of cable rating and data tables

Table Cable

voltage grade

Brief description

Land based installations:

9.12 600/1000 V PVC insulation

Current ratings of 1-core cables

9.13 600/1000 V PVC insulation

Impedance data in ohms/km

9.14 600/1000 V PVC insulation

Current ratings of 3 & 4-core cables

9.15 600/1000 V XLPE insulation

Current ratings of 1-core cables

9.16 600/1000 V XLPE insulation

Impedance data in ohms/km

9.17 600/1000 V XLPE insulation

Current ratings of 3 & 4-core cables

9.18 3800/6600 V

6350/11,000 V XLPE insulation

8700/15,000 V Current ratings of 1-core cables

9.19 3800/6600 V Impedance data in ohms/km

9.20 6350/11,000 V Impedance data in ohms/km

9.21 8700/15,000 V Impedance data in ohms/km

3800/6600 V

9.22 6350/11,000 V Current ratings of 3-core cables

8700/15,000 V

Marine installations:

9.23 600/1000 V EPR insulation

Current ratings of 1, 3 & 4-core cables

9.24 600/1000 V Impedance data in ohms/km