Q: Why should I use Voltage Portals ONLY on grounded metallic enclosures?

A: NCVD pens used with voltage portals rely on a capacitive coupling to ground, which makes the NCVD less versatile than a phase-to-phase/phase-to-ground voltmeter test. However, with Voltage Portals installed and the panel energized, workers can test the Voltage Portal with the NCVD to ensure it works. This means a capacitive ground connection exists and will always exist because panels do not move and workers stand in the same place when they test.