Recommended Practice for Measuring Incident Energy ExposureUL 29861 Scope1.1 This measurement method covers electrical equipment such as switchboards, panelboards, industrial control panels, meter socket enclosures, and motor control centers, rated 1000 V and less, that are intended to be installed in accordance with the National Electrical Code, NFPA 70, and optionally marked by the manufacturer with an available incident energy rating at a corresponding working distance in accordance with the Standard for Electrical Safety in the Workplace, NFPA 70E.