Many maintenance workers carry NCVD pens or AC voltage detectors in their tool belts. This portable device allows workers to quickly check electrical conductors for live voltage without actually touching the bare wire. The NCVD can sense voltage when positioned close to the live conductor without making a hard-wired electrical connection. A voltage portal is used to assist workers in creating an electrically safe work condition as part of a lockout-tagout procedure before beginning work on electrical or mechanical equipment.
