Subject-Approval No. 506 of 2004 under Regulation 181 (3) of the Coal Mines Regulations, 1957 for flameproof/weatherproof lighting transformer, type No. KLTI-A rated up to 400 VA, primary voltage up to 650 V, and secondary voltage 110/24/12/7.5 V in cast iron construction manufactured by M/S Kaysons Techno Equipment Pvt. Limited, Vithal Udyognagar, conforming to IS/IEC 60079-1:2014, IS/IEC 60079-0:2017 for use in below-ground coal mines–Renewal thereof

Please refer to your online application No. E-29021|62583|2025|Electrical (HQ) dated 14.10.2025, on the above subject and the CIMFR test report No.IN/CIMFR/TR19/H-175, dated:06.11.2029 BIS License No. CM/L- 7357884, drawing no: CP058-13, REV 03, dated: 01.11.2019.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 Regulation 208(3) of the Coal Mines Regulations, 2017, hereby renew the approval (DGMS Approval No. 506 of 2004) granted vide this Directorate's letter No. 464/337/EHQ dated 13.02.2004 for a further period of five years, i.e. up to 07.12.2030 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 application for renewal should be made at least three (03) months before the date of expiry of the approval.