IEC 61300-2-10:2012 evaluates the effect of loads which might occur when fibre optic devices are exposed to critical situations such as being stepped on or being run over by vehicle tyres. This second edition cancels and replaces the first edition published in 1995. It constitutes a technical revision. The changes with respect to the previous edition are to reconsider the entire text. Keywords: fibre optic devices exposed to critical situations