Designed to adhere to the IET Wiring Regulations BS 7671:2018
The way cables are installed will have an impact on how the cable
can safely function, cables can become hot over time due to load.
The ability for the cable to dissipate heat will allow the cable
to continue working without risk to life or it’s environment.
Derating Factors are applied to cables to simulate many
Installation methods, whether installed below or above ground,
in ducts or in groups can affect the way heat is managed.
Depending upon which cable is selected, Derating Factors
still apply, the type of factors will change accordingly and you
will only need to complete the fields applicable to your cable.
Row 1: 4B1 to 4B5 and Cf
Row 2: 4C1 to 4C6
Row 3: Apply to flexible cables on drums
E-Calcs - Calculator 7 - Factors
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