Voltage Tester
Also known as
Non-Contact Voltage Tester, NCVT, Circuit Tester
Used for
Checking whether a circuit, outlet, or cable is live before touching it — a critical safety step before opening a power distro box, splicing cable, or working on lighting circuits.
Trade note
Non-contact models detect the electromagnetic field around a live conductor without touching bare metal, making them the first tool out before any electrical work. They confirm a circuit is live, but a false negative is possible, so crews are trained never to rely on one alone.
Direct answer
Voltage Tester is used for checking whether a circuit, outlet, or cable is live before touching it — a critical safety step before opening a power distro box, splicing cable, or working on lighting circuits. It is also known as Non-Contact Voltage Tester, NCVT, Circuit Tester. Trade note: Non-contact models detect the electromagnetic field around a live conductor without touching bare metal, making them the first tool out before any electrical work. They confirm a circuit is live, but a false negative is possible, so crews are trained never to rely on one alone.
Reviewed