Impact surface means an interior or exterior surface that is subject to damage by repeated sudden force such as certain parts of door frames.
Cold Weather Alert means the notice that PJM provides to PJM Members, Transmission Owners, resource owners and operators, customers, and regulators to prepare personnel and facilities for expected extreme cold weather conditions.
Fluoroscopic imaging assembly means a subsystem in which X-ray photons produce a visual image. It includes the image receptor(s) such as the image intensifier and spot-film device, electrical interlocks, if any, and structural material providing linkage between the image receptor and diagnostic source assembly.
Invasive species means an alien species whose introduction does or is likely to cause economic or environmental harm or harm to human health.
Basement means any area of the building having its floor subgrade (below ground level) on all sides.