The requirements of this standard shall apply to all levels of protection unless otherwise stated.
In the determination of level of protection “ia", "ib" or “ic”, failure of components and
connections shall be considered in accordance with 7.6. Failure of separations between
conductive parts shall be considered in accordance with 6.3. The determination shall include
opening, shorting and earthing of the external intrinsically safe connection facilities in
accordance with 6.2.