Acronyms/Abbreviations 309
Not Applicable NA, N/A
National Association of
Home Builders NAHB
Natural NAT
Natural Grade NAT GR
National Bureau of Standards NBS
Normally Closed NC
National Electric Code NEC
Negative NEG
National Fire Protection Association NFPA
Non-Fused Safety Switch NFSS
Nickel NI
Not In Contract NIC
Nonmetallic NMT
Normally Open NO
Number NO
Net Operating Income NOI
Nominal NOM
Nominal Pipe Size NPS
Noise Reduction NR
Noise Reduction Coefficient NRC
Not to Scale NTSOrange O
Oxygen O
Outside Air OA
Overall (Measure) OA
Outside Air Intake OAI
Obscure OBS
On Center OC, O/C
Outside Diameter OD
Open-end Drain OED
Open-end Duct OED
Overflow OF
Outside Face OF
Overhang (Eave Line) O/H
Overhead OH, OVHD
Overhead Door OH Door
Ovalhead Machine Screw OHMS
Ovalhead Wood Screw OHWS
Open Web Joist OJ
Opaque OP
Opening OPGOpposite OPP
Opposite Surface OPS
Optimum OPT
Original ORIG
Ounce OZ
Pound LB
Parallel PAR
Panic Bar PB
Pushbutton PB
Particleboard PBD
Piece PC
Pull Chain PC
Property Condition Assessment PCA
Precast Concrete PCC
Pounds Per Cubic Foot PCF
Cement Plaster (Portland) PCPL
Property Condition Report PCR
Porcelain Enamel PE
Pedestal PED
Perimeter PER
Perforate (d) PERF
Perimeter PERI
Perpendicular PERP
Prefabricated (d) PFB
Preferred PFD
Pounds Per Lineal Foot PFL
Prefinished PFN
Plate Glass PG
Pressure Gauge PG
Parking PK
Plate PL, PLT
Property Line PL
Plastic Laminate PLAM
Plastic PLAS
Plaster PLAS, PLAST, PLS
Platform PLAT
Plumbing PLBG
Plywood PLYWD,PLY, PWD
Protected Membrane
Roofing System PMRS
Panel PNL
Paint (ed) PNT