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90°C and 180°C Thermosetting Insulated Flexible Cables With Sheath, Non Armoured (COPPER CONDUCTORS)
Tables Apply to: Flexible Cables (also see tables - (Flexible Cords, Non Armoured) and (60°C Thermosetting Insulated Flexible Cables With Sheath, Non Armoured)
CURRENT-CARRYING CAPACITY (amperes)
|Conductor Cross Sectional Area||Single-phase a.c. or d.c. (1 two core cable, with or without protective conductor)||Three-phase a.c. (1 three core, four core or five core cable)||Single-phase a.c. or d.c. (2 single core cables touching)|
Rating Factor for Ambient Temperature
90°C Thermoplastic or Thermosetting Insulated Cords:
180°C Thermosetting Insulated Cords:
|Ambient Temperature:||35°C to 90°C||95°C||100°C||105°C||110°C||150°C||120°C||125°C||130°C||135°C||140°C||145°C|
|Correction Factor: ||1.00||0.96||0.91||0.86||0.81||0.76||0.70||0.64||0.57||0.50||0.40||0.28|
- The current ratings tabulated are for cables in free air but may also be used for cables resting on a surface. If the cable is to be wound on a drum on load the ratings should be reduced in accordance with Note 2 below and for cables which may be covered, Note 3 below.
- Flexible cables wound on reeling drums
- The current ratings of cables used on reeling drums are to be reduced by the following factors:
a) Radial type drum | ventilated: 85% | unventilated: 75%.
b) Ventilated cylindrical type drum, 1 layer of cable: 85%, 2 layers of cable: 65%, 3 layers of cable: 45%, 4 layers of cable: 35%
- A radial type drum is one where spiral layers of cable are accommodated between closely spaced flanges; if fitted with solid flanges the ratings given above should be reduced and the drum is described as non-ventilated. If the flanges have suitable apertures the drum is described as ventilated.
- A ventilated cylindrical cable drum is one where layers of cable are accommodated between widely spaced flanges and the drum and end flanges have suitable ventilating apertures.
- Where cable may be covered over or coiled up whilst on load, or the air movement over the cable restricted, the current rating should be reduced. It is not possible to specify the amount of reduction but the table of rating factors for reeling drums can be used as a guide.
- For 180°C cables, the rating factors for ambient temperature allow a conductor operating temperature up to 150°C. Consult the cable manufacturer for further information.
- Where it is intended to connect the cables in this table to equipment or accessories designed to operate at a temperature lower than the maximum operating temperature of the cable, the cables should be rated at the maximum operating temperature of the equipment or accessory (see Regulations 512.1.5).
- Where it is intended to group a cable in this table with other cables, the cable should be rated at the lowest of the maximum operating temperatures of any of the cables in the group (see Regulations 512.1.5).
VOLTAGE DROP (per ampere per metre)
|Conductor Cross Sectional Area||1 two-core or 2 single-core cables d.c.||Two-core cable, single-phase a.c.||1 three-core, four core or five core cable, three-phase a.c.||2 single-core cables touching, single-phase a.c.*|
| || ||r||x||z||r||x||z||r||x||z|
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- The voltage drop figures given above are based on a conductor operating temperature of 90°C and are therefore not accurate when the operating temperature is in excess of 90°C. In the case of the 180°C cables with a conductor temperature of 150°C the above resistive values should be increased by a factor of 1.2.
- *A larger voltage drop will result if the cables are spaced.