SIS

3 coding systems recognise this code

NEC / UL (USA)

SymbolMeaning
SISSwitchboard wire, thermoset insulation (reading by usage, UNVERIFIED)
SISSwitchboard and control wire, cross-linked polyethylene, 90 C. 600 V, 90 C. UL 44; NEC Table 310.104(A)

IEEE 1580

SymbolMeaning
SSingle Conductor Distribution
ISIndividual Screen

UNE

SymbolMeaning
SSilicone Rubber
IChlorosulphonated Polyethylene (CSM)
SSilicone Rubber