Subject: Approval under Regulation 208 (3) of the Coal Mines Regulations, 2017 for Volga make flameproof air break switchgear in mild steel & C.I. FG-150 construction, type no. GBF-2 rated at 400 A, 550 V for use in belowground Coal Mines – Renewal thereof.

Please refer to your online application no. E-29021/62651/2025/Electrical (HQ) dated 06/12/2025, and CIMFR Test & Assessment Test Report No. IN/CIMFR/TR20/840 dated 17/03/2020, Report no. CIMFR/FES/25-26/32 dated 21/01/2026 and clarification letter no. CIMFR/FES/Clarification/22-23/311 dated 08/12/2022; BIS License No. CM/L- 1855466 and other documents submitted therewith in this regard.

I, in exercise of powers conferred upon Chief Inspector of Mines (also designated as Director General of Mines Safety) under Regulation 208(3) of the Coal Mines Regulations, 2017, hereby renew the approval (DGMS Approval No. 473 of 2000) granted vide this Directorate's letter No. 335/631/EHQ dated 22.06.2000 for a further period of Five years i.e. up to  28/01/2031  for use in below-ground Coal Mines.

The conditions mentioned in the original approval and subsequent renewal letters shall be strictly complied with.

Please note that application for renewal should be made at least three (03) months before the date of expiry of the approval.