FRN

2 coding systems recognise this code

NEC 402

SymbolMeaning
FFixture Wire, Standard Stranding
RThermoset Insulation
NNylon Jacket

CEI-UNEL 35011 (Italy)

SymbolMeaning
FFine-Wired In Flexible Cables-Class 5
RPolyvynil Chloride (PVC)
NSteel Tape Armour