BS4937 Part 30 1993 which conforms to IEC 584-3. PRT Extension Cable. Flexible screened copper cables with a black sheath suitable for use with 2, 3 and 4 wire PT100 sensors / platinium resistance thermometers etc PVC insulated cable for extending Platinum Resistance Thermometers Can be used to extend 2, 3 or 4 wire RTD configurations Commonly used for Pt100Ω thermometers but also suitable with other types such as Pt130, Pt500 ; Pt1000Ω 4 core PVC insulated 7/0.2mm tin plated copper conductors, twisted cores, polyester tape ; nylon cord, tin plated copper braided screen with PVC insulated outer jacket Cores colour coded 2 x Red / 2 x White to IEC-751 with black outer jacket Heat resistant PVC to 105°C Good for general purpose cable, highly flexible ; waterproof Insulation rating -10°C to 105°C Supplied in 10, 25 ; 50 metre reel lengths