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Learn how to do your electrical preparation from scratch, I will explain step by step what to buy and how to connect it, I will also teach you how to use the multimeter and the current tester. Specification for single-phase low-voltage service (CFE): https://lapem.cfe.gob.mx/normas/const... Electrical preparation for power supply (CFE): https://www.cfe.mx/Casa/InformacionCl...