What Are Low Voltage Systems?
Low voltage (LV) systems operate at 50V AC or 120V DC or less and include the communication, security, and data infrastructure of a building: structured cabling networks, access control, video surveillance (CCTV/IP cameras), intercom systems, nurse call, paging, and distributed antenna systems (DAS). Unlike line-voltage electrical systems, LV work is typically governed by NEC Article 725 (remote-control, signaling, and power-limited circuits), Article 800 (communications), and specific system standards like TIA-568 for cabling.