22171750 TR ELP TEC-GP WH The TECTON terminating resistor adapter, TR ELP TEC-GP, contains two matched RC modules and is always placed at the end of the last mounting rail. The 2 independent 48V DC end circuits are contacted by turning the rotary knob and EL1/EN1, EL2/EN2 are thus terminated with high impedance. By setting the TECTON adapter, the 48V DC Powerline is terminated with high impedance so that the line impedance of the emergency light conductors in the trunking rail is adapted. This improves the Powerline useful signal. Housing colour. The adapter is available in white, silver or black.