NO: E-29021|61843|2024|Electrical(HQ)                                                                          Dhanbad, Date: 06.06.2024

                                                  DGMS APPROVAL NO.- 823 of 2024 (Permissible variation-1)

From

Director General of Mines Safety
Directorate General of Mines Safety,
P.O & Distt: Dhanbad - 826 016.

To

JOYDIP CHAKRABORTY, electroteknica engineering pvt.lted., ELECTROTEKNICA ENGINEERING PVT.LTD. 1/5B, RAJA BASANTA ROY ROAD, KOLKATA700026
West Bengal, KOLKATA, KOLKATA, 700026

Subject:: Approval under Regulation 208(3) of the Coal Mines Regulations, 2017 for Flameproof transwitch unit, Type- FTSU-2A, rated at 6.6 KV, 1000 KVA, primary voltage 6.6 KV, secondary voltage 1100V and 550 V, conforming to IS/IEC 60079-0-2017 and IS/IEC 60079-1-14, manufactured by M/s- Electroteknica engineering Pvt.Ltd, for use in belowground Coal Mines in India- Permissible variation thereof..

Sir,

Please refer to your online application ID: 61843 dated 07.03.2024, test reports and other supporting documents submitted therewith on the above-mentioned subject.

The matter has been examined and based on the CIMFR test report no. IN/CIMFR/TR/R/446 dated 10.05.2021 and the associated drawing no. 51-D-03831 (Total-5 sheets) dated 14.11.2019, following permissible variation is allowed without affecting flameproof features of the subject equipment subject to fulfillment of the conditions stipulated in approval No. 823 of 2024.

1. Apparatus covered under regular approval no.823 of 2024:

           "Flameproof transwitch unit, Type- FTSU-2A, rated at 6.6 KV, 1000 KVA, primary voltage 6.6 KV, secondary voltage 1100V and 550 V, manufactured by M/s- Electroteknica engineering Pvt.Ltd "

2. Permissible variation allowed under this approval:

          “Flameproof transwitch unit, Type- FTSU-2A, up to 1000 KVA, Primary voltage:6.6 KV, secondary voltage up to 1100 V and 550V, manufactured by M/s- Electroteknica engineering Pvt.Ltd, without change in dimension, volume and Flameproof features”.

This letter shall always be accompanied with the approval no. 823 of 2024 issued online vide reference no. E-29021/61721/2023/Electrical(HQ), Dhanbad dated 25.01.2024.