NPLFP is a NEC / UL (USA) cable designation: NPLF = Non-power-limited fire alarm cable (NEC 760 Part II); P = Plenum; NPLFP = Non-power-limited fire alarm cable, plenum. 600 V (typical). UL 1425; NEC Article 760 Part II.
4 coding systems recognise this code
NPLF
P
NPLFP
N
L
F
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