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Multicore 90°C Thermosetting Insulated and Thermoplastic Sheathed Cables, Non Armoured (COPPER CONDUCTORS)

Tables Apply to: 6241B, H6242B, H6243B

CURRENT-CARRYING CAPACITY (amperes)

Conductor Cross Sectional AreaReference Method AReference Method B Reference Method C (clipped direct)Reference Method E (free air or on a perforated cable tray etc horizontal or vertical)
(enclosed in conduit in thermally insulating wall etc.)(enclosed in conduit on a wall or in trunking etc.)
1 two-core cable*, single-phase a.c. or d.c.1 three- or four-core cable*, three-phase a.c. 1 two-core cable*, single-phase a.c. or d.c.1 three- or four-core cable*, three-phase a.c. 1 two-core cable*, single-phase a.c. or d.c.1 three- or four-core cable*, three-phase a.c. 1 two-core cable*, single-phase a.c. or d.c.1 three- or four-core cable*, three-phase a.c.
123456789
(mm2)(A)(A)(A)(A)(A)(A)(A)(A)
114.513171519142118
1.518.516.52219.524222623
2.52522302633303632
43330403545404942
64238514458526354
105751696080718675
167668918010796115100
259989119105138119149127
35121109146128171147185158
50145130175154209179225192
70183164221194269229289246
95220197265233328278352298
120253227305268382322410346
150290259334300441371473399
185329295384340506424542456
240386346459398599500641538
300442396532455693576741621
400--625536803667865741

* with or without a protective conductor.

NOTES :

  • Where a conductor operates at a temperature exceeding 70°C it must be ascertained that the equipment connected to the conductor is suitable for the conductor operating temperature (see Regulation 512.1.2).
  • Where cables in this table are connected to equipment or accessories designed to operate at a temperature not exceeding 70°C, the current ratings given in the equivalent table for 70°C thermoplastic insulated cables (Table 4D2A) must be used (see also Regulation 523.1)

VOLTAGE DROP (per ampere per metre)

Conductor Cross Sectional AreaTwo-core cable d.c.Two-core cable single-phase a.c.Three- or four-core cable, three-phase a.c.
1234
(mm2)(mV/A/m)(mV/A/m)(mV/A/m)
1464640
1.5313127
2.5191916
4121210
67.97.96.8
104.74.74
162.92.92.5
  rxzrxz
251.851.850.161.91.60.141.65
351.351.350.1551.351.150.1351.15
500.980.990.15510.860.1350.87
700.670.670.150.690.590.130.6
950.490.50.150.520.430.130.45
1200.390.40.1450.420.340.130.37
1500.310.320.1450.350.280.1250.3
1850.250.260.1450.290.220.1250.26
2400.1950.20.140.240.1750.1250.21
3000.1550.160.140.210.140.120.185
4000.120.130.140.190.1150.120.165

DISCLAIMER: This information has been supplied in good faith and the upmost care has been taken to ensure the data is accurate in it's derivation from BS7671.

However, this information should not be considered as a substitute for BS7671, which should always be referred to. It remains the responsibility of the user to ensure all data and assumptions are correct and that any cable used is suitable for its intended purpose.

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