N
negligent
network current
night watchman
nitro
no smoking
no smoking area
nominal delivery rate
nominal opening
nominal rated output
nominal width
non - flambable mixture
non - loadbearing internal wall
non combustibility
non combustible material
non flammable
non load bearing
non return valve
non-infammable roof covering
noncombustible
normal measure
normal pressure pump
notice of installation
nozzle , jet
nozzle discharge
nozzle, (branchpipe)
number of storeys
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