Rail tunnel egress point spacing 244m vs 762m

Discussion created by yunlongliu on Nov 27, 2017
Latest reply on Nov 23, 2018 by khoosk

For the railway tunnels, NFPA 130 Clause requires the cross passage for emergency egress should be spaced no more than 244 m (800 ft). However, clause Within underground or enclosed trainways, the maximum distance between exits shall not exceed 762 m (2500 ft). This distance is much longer than 244 m as required by Clause, but they service the same purpose, i.e., emergency evacuation. Any explanation for this difference?