How Permanent Electrical Safety Devices Affect Safety
For more than a decade, many Fortune 500 companies have been installing permanent electrical safety devices (PESDs) into electrical panels as a safety-by-design practice for both their mechanical and electrical lockout/tagout (LOTO) procedures. The voltage indicator (see Figure 1) lies at the center of these PESDs. It can illuminate when voltage (20-750VAC/30-100VDC) is present on any phase or neutral conductor, without the need for a battery or separate power supply.