Page 447 - Acel Catalogue 2021-22

Useful Information - Current Carrying Capacity
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PVC Flexibles
Flexible Cords, Non-Armoured (COPPER CONDUCTORS)
CURRENT - CARRYING CAPACITY (amperes) and MASS SUPPORTABLE (kg)
Conductor Cross Sectional Area
Current-carrying capacity
Maximum mass supportable by twin flexible cord (see Regulations 522.7.2 and 559.6.1.5)
Single-phase a.c.
Three-phase a.c.
1
2
3
4
(mm2)
(A)
(A)
(kg)
0.5
3
3
2
0.75
6
6
3
1
10
10
5
1.25
13
-
5
1.5
16
16
5
2.5
25
20
5
4
32
25
5
60°C Thermoplastic or Thermosetting Insulated Cords
90°C Thermoplastic or Thermosetting Insulated Cords
180°C Thermoplastic or Thermosetting Insulated Cords
Glass Fibre Cords
NOTES:
• 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.
Ambient Temperature
35°C
40°C
45°C
50°C
55°C
Correction Factor
0.91
0.82
0.71
0.58
0.41
Ambient Temperature
35°C to 50°C
55°C
60°C
65°C
70°C
Correction Factor
1
0.96
0.83
0.67
0.47
Ambient Temperature
35°C to 120°C
125°C
130°C
135°C
140°C
145°C
Correction Factor
1
0.96
0.85
0.74
0.6
0.42
Ambient Temperature
35°C to 150°C
155°C
160°C
165°C
170°C
175°C
Correction Factor
1
0.92
0.82
0.71
0.51
0.4
VOLTAGE DROP (per ampere per metre)
NOTE:
* The tabulated values above are for 60°C thermoplastic or
thermosetting insulated flexible cables and for other types of flexible cable they are to be multiplied by the following factors: • 90°C thermoplastic or thermosetting insulated 1.09
• 150°C 1.31
• 185°C glass fibre 1.43
Conductor Cross Sectional Area
d.c. or single-phase a.c.
Three-phrase a.c.
1
2
3
(mm2)
(mV/A/m)
(mV/A/m)
0.5
93
80
0.75
62
54
1
46
40
1.25
37
-
1.5
32
27
2.5
19
16
4
12
10
For more information visit www.electric-center.co.uk
447
Section 11 - Useful Information & Index