This handbook covers the code of practice in protection circuitry including standard lead and device numbers, mode of connections at terminal strips, colour codes in multicore cables, dos and donts in execution. presentation of protection and control relaying. It covers standard codes, wiring practices, and norms for protecting generators, transformers, and lines, and provides detailed. Document converted into new template and updated throughout to reflect details of protection panels, relays and schemes currently in use. The copyright of this document, which contains information of a proprietary nature, is vested in Electricity North West Limited. The HT power supply is received from GO switch and distributed to the.