The classification B2ca comprises the main requirements:
1. contains flame dispersion
2. limits the spread of fire
3. limits the heat-release rate
Other safety criteria are also required, however. This additional classification is provided with the letters ‘s’ (smoke), ‘d’ (droplets) and ‘a’ (acidity).
The additional classification s1 d0 a1 is the highest classification possible and contains:
s1: no high smoke emission
d0: no flaming droplets
a1: no corrosive gases formed
If no additional classification is provided, the wire does not comply with the safety requirements.