Extra-low voltage (ELV) is an electrical supply voltage and is part of the low voltage band in a range which is carries a low risk of dangerous electrical shock. Inside the construction industry, the word “ELV” refers to a way of electrically characterizing all the building’s systems that need power to operate but aren’t part of the main electrical system. By having G7, the highest grade in CIDB license, SECOM (Malaysia) reflect the tendering capacity of a companies to accept a range of construction projects at a higher value. This includes security system, alarm system, access control system that is closely related to security needs.