Electrical systems with voltages significantly lower than mains wiring. Examples include ethernet, telephone, cable tv, and alarm systems.
Low-voltage electrical systems are those with voltages significantly lower than standard mains wiring. In the US at least, these systems don't generally require inspections.
- Mains wiring: 120V
- Telephone wiring: 48V DC (~90V AC when ringing)
- Ethernet: 5V
- Alarm systems: typically 12V