3.3 Fire protection
DIN VDE 0100-482 requires measures for the prevention of res which can be
caused by insulation faults in “locations exposed to re hazards”. This stipulates
that cables and conductors in TN and TT systems must be protected by means of
residual current protective devices with a rated residual current of I
Δn
≤ 300 mA.
This does not include mineral-insulated cables and busbar systems.
In applications in which resistive faults can cause a re (e.g. radiant ceiling heating
with panel heating elements), the rated residual current must be I
Δn
= 30 mA. The
re protection provided by residual current protective devices, however, should
not be limited to locations exposed to re hazards but should always be provided.
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