The WCB107 cable set is used with following temperature controllers from Wavelength Electronics: PTC2.5K-CH, PTC5K-CH, PTC10K-CH or PTC10K-SL. The WCB107 cable set is 24 inches long (61 cm). Two 14 ga twisted pair wires are designed to deliver power from the power supply to the PTC (red and black) and controlled current to a thermoelectric from the PTC (orange and yellow). Standard lengths for high current wires are 24 inches. Longer leads will result in larger voltage drop and wire heating. Wires are twisted to optimize performance. Strain relief of high current cables is strongly recommended to keep wires firmly attached to terminal block.