Wire specifications of lamp

The Wire specifications of lamp can be divided into the following categories:

BV、BVR、RV：They are all single core cable
BV：BV also single core cable, the wire were relatively hard. , it is not easily deformed.
BVR：The BVR is Stranded wire mixed up and Stranded wire form an indivisible whole. it also call soft wire. example: PVC insulated conductor with copper wire polyethylene solid insulated cord
RV：RV also is soft wire ,the RV differences with the BVR. because the RV was right have more Stranded wire.
BVVB：The BVVB hard casing wire, In each casing will be inserted that three BV wire .
RVV：The RVV soft casing wire, In each casing will be inserted that
three BV wire .