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Sub: Approval under regulation 208(3) of the Coal Mines Regulations, 2017 for flameproof enclosure for Transwitch Unit rated up to 1000KVA, primary voltage up to 3.3 KV, secondary voltage at 1140 V in MS/CI construction, type no. FLP TX-02 conforming to IS/IEC 60079-0:2017 and IS/IEC 60079-1:2014, manufactured by M/s. Prabhu Industrial Udyog Pvt. Ltd., Kolkata, for use in belowground Coal Mines-Renewal thereof.
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Please refer to your online application No.E-29021|62697|2026|Electrical(HQ) dated 09.01.2026, on the above subject and CIMFR Test & Assessment Report No. : IN/CIMFR/TR20/796 dated 11.03.2020,CIMFR letter Ref. No. CIMFR/FES/Clarification/22-23/310, dated 08.12.2022, CIMFR letter Ref. No. CIMFR/FES/25-26/32 dated 21.01.2026 , BIS License No. CM/L-1855466, Drawing No- (a) 25TEST-15-1R1, Rev -00 Sheet 1 of 1 Date: 09.09.2019 ,(b)25TEST-16-1R1, Rev -00 Sheet 1 of 1 Date: 09.09.2019 ,(c) 25E0300-2R1, Rev -00 Sheet 1 of 1 Date: 09.09.2019 ,(d) 25E0301-2R1, Rev -00 Sheet 1 of 1 Date: 09.09.2019 (e) 25E0202-2R1, Rev -01 Sheet 1 of 1 Date: 09.09.2019 ,( f) 25TEST-13-2R, Rev -01 Sheet 1 of 1 Date: 19.09.2019 ,(g)25E0203-2R, Rev -01 Sheet 1 of 1 Date: 19.09.2019 ,(h)25TEST-09-2R/1, Rev -00 Sheet 1 of 1 Date: 09.09.2019 ,and (i) 25TEST-09-2R/1A, Rev -00 Sheet 1 of 1 Date: 09.09.2019 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 Regulation208(3) of the Coal Mines Regulations, 2017, hereby renew the approval (DGMS Approval No. 639 of 2012) granted vide this Directorate's letter No. 484/1053/EHQ dated 26.04.2012 for a further period of five years, i.e. up to 02.03.2031 for use in belowground Coal Mines. The conditions mentioned in the original approval and subsequent renewal letters shall be strictly complied with.
Please note that an application for renewal should be made at least three (03) months before the date of expiry of the approval.
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