Again, grounding and shielding is a remedy. A second person nearby makes a cell-phone call. The cell phone interferes with the remote controls and puts the wheelchair in motion, violently slamming the person against the wall. The above three considerations are reasons those with pacemakers watch for alerts at restaurants and other commercial and industrial locations, and why you must turn off your cell phone in airplanes and many hospitals. This covers neon advertising signs and neon devices built-in to other lighting devices, and frequencies ranging from 9 kHz to 400 GHz.
Several suppliers provide approved electronic power supplies designed for such applications.
It will be one of my objectives in this column to feature standards, safety and techniques to assist our sign industry in manufacturing and installing responsibly. Super Vision - LEDs and fiber optic components and kits for the sign industry.