Single Cable Spacing Guide
Use the table below to determine your requirements.
Cablewarm® Heating Cables @ 15 Watts per Linear Metre - Variable Power Output W/m²
| Type | Output
(watts)
|
Load (amps) |
Resistance (ohms) |
Cable Length
(m)
|
Heated Area
(200 W/m2)
75mm spacing |
Heated Area
(150 W/m2)
100mm spacing |
Heated Area
(125 W/m2)
125mm spacing |
Heated Area
(100 W/m2)
150mm spacing |
| CWC15-240 | 240 | 1.0 | 220 | 16 | 0.8 | 1.1 | 1.4 | 1.7 |
| CWC15-300 | 300 | 1.3 | 176 | 20 | 1.5 | 2.0 | 2.5 | 3.0 |
| CWC15-400 | 400 | 1.7 | 132 | 25 | 1.9 | 2.5 | 3.1 | 3.7 |
| CWC15-470 | 470 | 2.0 | 112 |
31 | 2.5 | 3.1 | 3.9 | 4.7 |
| CWC15-630 | 630 | 2.7 | 84 | 41 | 3.1 | 4.1 | 5.1 |
6.1 |
| CWC15-750 | 750 | 3.3 | 71 |
51 | 3.8 |
5.1 | 6.4 | 7.6 |
| CWC15-950 | 950 | 4.1 | 55 | 60 | 4.5 |
6.0 | 7.5 | 9.0 |
| CWC15-1100 | 1100 | 4.8 | 48 |
75 | 5.6 | 7.5 | 9.4 | 11.2 |
| CWC15-1350 | 1350 | 5.9 | 39 |
93 | 7.0 | 9.3 | 11.6 | 14.0 |
| CWC15-1600 | 1600 | 6.9 | 33 | 107 | 8.0 | 10.7 | 13.4 | 16.0 |
| CWC15-2000 | 2000 | 8.7 | 26 |
135 | 10.1 | 13.5 | 16.9 | 20.2 |
| CWC15-2400 | 2400 | 10.4 | 22 |
162 | 12.1 | 16.2 | 20.2 | 24.3 |
| CWC15-2700 | * 2700 (2 cables) | 11.7 | 19.5 | 2 x 93 | 14.0 |
18.6 | 23.2 | 27.9 |
| CWC15-3200 | * 3200 (2 cables) | 13.9 | 16.5 | 2 x 107 | 16.0 | 21.4 |
26.8 | 32.1 |
| CWC15-3600 | * 3600 (2 cables) | 15.6 | 14.7 | 107 + 135 | 18.1 | 24.2 |
30.2 | 36.3 |
| CWC15-4000 | * 4000 (2 cables) | 17.4 | 13.2 | 2 x 135 | 20.2 | 27.0 | 33.7 | 40.0 |
| CWC15-4400 | * 4400 (2 cables) | 19.1 | 12 | 135 + 162 | 22.3 | 29.7 | 37.1 | 44.5 |
To calculate cable spacing, use the following formula: Area (m2) ÷ Cable Length X 1000 = cable spacing (mm)
Please note: Floor Heating Ltd heating cables are based on a higher output of 15 watts per linear metre
For greater areas individual cable lengths can be joined in any configuration and connected in parallel.
A contactor can be used where a single thermostat is required to control a total area of underfloor heating exceeding a 13amp fused spur supply. The contactor will control up to a maximum of 22K/w (22,000 watts) of heating cable or 96amps total loading.
Click here for more information on contactor.
NOTE: Ampage loading is based on 230 Volts
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