Do the GracePESD® Voltage Indicators comply with NEC 250.21b in a ungrounded system?

A: Our GracePESD Voltage Indicators will comply with the NEC 250.21 (B). Our product can be installed as long as the installation ensures the Ground wire references an earth-ground or bonded panel.

It is very important that the Ground wire on the GracePESDs are connected to a safe potential. For floating power systems, the Ground wire can be terminated to an earth ground or an equipment ground.