PVC pyro is used in a wide range of appliances and can be easily mistaken for clean pyro.
Typically, PVC pyro has an overall diameter of 5 - 26mm and consists of the following materials:
Bare copper
PVC sheath
Low smoke and fume polymer sheath
Depending on the type of appliance it's used for, the thermoplastic-sheath for these cables can come in white, red, black or orange.
You will usually find PVC pyro in power and control circuits like fire alarm systems.