Plant Auxiliary Flashcards
Recessed troffers
rectangular light fixtures that fit into grids of recessed ceilings (prismatic panel distribution)
Ceiling Mount Wraparounds
Fluorescent fixtures that are mounted directly on the ceiling or wall surface
Open Reflectors
Shields to partially screen lamps from view
Structural Lighting
Lamps fitted into architectural components of a room
3 main types of illumination?
General, local, Combined
General
Uniform illumination
Local/Supplimentary
Illuminate work areas or displays regardless of overall uniform ambient light
Combined
Provides a resonable lighting level
Direct lighting
Luminous intensity is directed DOWN towards work area
Indirect lighting
Luminous intensity is directed UP and reflected onto work area
Air Gap Backflow Prevention
Physical separation from the free flowing discharge end of a potable water pipe and an open non-pressurized vessel
Reduced Pressure Device (RPZ)
Consists of two independently operating check valves with an automatic operating pressure differential relief valve in-between them
Double Check Valve Device (DCVA)
Consists of two independently acting check valves
Pressure Vacuum Breakers (PVB)
Consist of a single body which contains a spring loaded check valve
Atmospheric Vacuum Breakers (AVB)
Has a moving element inside that prevents water from spilling from the device during flow, if flow stops the device drops down to provide a vent opening
Soil Pipes
Carry waste liquids and solids
Waste pipes
Convey material from any building fixture other than a toilet
Common water seal
3.8cm
Deep water seal
10cm
