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what is V0/V rating of cable

what is V0/V rating of cable..

HB: slow burning on a horizontal specimen; burning rate <
76 mm/min for thickness < 3 mm.
V2 burning stops within 30 seconds on a vertical specimen;
drips of flaming particles are allowed.
V1: burning stops within 30 seconds on a vertical
specimen; drips of particles allowed as long as they are
not inflamed.
V0: burning stops within 10 seconds on a vertical
specimen; drips of particles allowed as long as they are
not inflamed.
5VB: burning stops within 60 seconds on a vertical
specimen; no drips allowed; plaque specimens may develop a
hole.
5VA: burning stops within 60 seconds on a vertical
specimen; no drips allowed; plaque specimens may not
develop

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