BS PD TS 62271-210:2013
BS PD IEC/TS 62271-210:2013
High-voltage switchgear and controlgear. Seismic qualification for metal enclosed and solid-insulation enclosed switchgear and controlgear assemblies for rated voltages above 1 kV and up to and including 52 kV
standard published 02/28/2013 by British Standards Institution