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How much current does is take to melt a cable?

E95

Hi all,

Recently I've encountered a bit 16mm 5 core SY cable. (Strangely the earth cable and pin has been burnt/melted at the plug and socket of the extension lead)

Struggling to determine whether this was either a design fault, cable defect or external fault

It appears that the cable is rated for 61.5A with the 0.75 derating factor due to five cores, and at one section of the cable it has been tightly coiled. Assuming that it is fed from a BS-88 fuse it would take 3600s (One hour) to operate.

What point does the cable burn up, how is this calculated? The load current is 75A, would this cause cable damage prior to operation?

Regards

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  • 0

    The earth core was carrying a large current. That sounds bad. (Copper melts at over 1,000 degrees Celsius, and brass at about 930 degrees Celsius)

    Technical Data Conductor : Bare copper, fine wire strand in accordance to IEC 60 228 that is VDE 0295, class 5 Core insulation : PVC compound TI1 in accordance to VDE 0207 Identification : In acc. to VDE 0293, black cores with white numbers with or without green / yellow ground conductor Inner sheath : PVC compound TM2 in acc. to VDE 0207 Braid : Galvanised steel wire braid Outer sheath : Transparent PVC compound TM2 in acc. to VDE 0207 Nominal voltage : 300 / 500 V Test voltage : 3,000 V ac Temperature range : For flexible use -5 up to +70°C maximum conductor temperature Fixed installation -40 up to +80°C maximum conductor temperature Minimum bending radius : Fixed installation 12.5 × cable diameter Flame retardant : In acc. to IEC 60 332.1 resp. VDE 0472 part 804 EC directive : This cable confirms to ECD 73 / 23 / EEC (low voltage directive)

    .

    Z.

Reply
  • 0

    The earth core was carrying a large current. That sounds bad. (Copper melts at over 1,000 degrees Celsius, and brass at about 930 degrees Celsius)

    Technical Data Conductor : Bare copper, fine wire strand in accordance to IEC 60 228 that is VDE 0295, class 5 Core insulation : PVC compound TI1 in accordance to VDE 0207 Identification : In acc. to VDE 0293, black cores with white numbers with or without green / yellow ground conductor Inner sheath : PVC compound TM2 in acc. to VDE 0207 Braid : Galvanised steel wire braid Outer sheath : Transparent PVC compound TM2 in acc. to VDE 0207 Nominal voltage : 300 / 500 V Test voltage : 3,000 V ac Temperature range : For flexible use -5 up to +70°C maximum conductor temperature Fixed installation -40 up to +80°C maximum conductor temperature Minimum bending radius : Fixed installation 12.5 × cable diameter Flame retardant : In acc. to IEC 60 332.1 resp. VDE 0472 part 804 EC directive : This cable confirms to ECD 73 / 23 / EEC (low voltage directive)

    .

    Z.

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