NO: E-29021|62123|2025|Electrical(HQ)                                                                                                                                                                                                                                    Dhanbad, Date: 08.01.2025

DGMS APPROVAL NO.-846 of 2025

From

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

To

RAKESH KUMAR SINGH, JMS Mining Pvt. Ltd., DONGFANG ELECTRIC BUILDING 3RD FLOOR, PREMISES 16, MAR - 1111, ACTION AREA 1A, NEWTOWN
West Bengal, KOLKATA, KOLKATA, 700156

Subject:   Approval for field trial of flameproof/Weatherproof/Intrinsically safe apparatus incorporated/associated with the Roof Bolter machine, Model JMS RB 30, conforming to IS/IEC 60079-0-2017, IS/IEC 60079-1-2014 and IS/IEC 60079-11-2011 manufactured by M/s. JMS Mining Pvt Ltd for use in belowground coal mines in India- Regular approval thereof.

Sir,

I, in the exercise of powers conferred upon the Chief Inspector of Mines (also designated as Director General of Mines Safety) under Regulation 208(3) of the Coal Mines Regulations, 2017, and in reference to Field Trial approval issued vide letter No. E-29021|61708|2023|Electrical(HQ) dated 15.12.2023, the test reports as listed in annexure-B and based on the performance report received from the Churcha RO, Baikuntpur Area of M/s. South Eastern Coalfield Limited hereby accords the approval (DGMS Approval No. 846 of 2025) for five years from the date of issue of this letter, i.e. up to 08.01.2030 for use in Belowground Coal Mines in India with the conditions as mentioned in the Annexure-A.

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

Annexure-A

Conditions for approval under Regulation 208(3) of the Coal Mines Regulations, 2017 for flameproof/Weatherproof/Intrinsically safe apparatus incorporated/associated with the Roof Bolter machine, Model JMS RB 30, conforming to IS/IEC 60079-0-2017, IS/IEC 60079-1-2014 and IS/IEC 60079-11-2011 manufactured by M/s. JMS Mining Pvt Ltd for use in belowground coal mines in India for use in belowground Coal mines in India.

1. Every unit shall carry conspicuously in a permanent manner the aforesaid identification mark, i.e. ‘DGMS Approval No. 846 of 2025’.
2. In addition, every unit shall also carry permanently this Directorate’s approval mark, as below:   
3.                                                                                                                                                                                                                                      
3. The design of the electrical circuit shall not be changed without obtaining prior approval from this Directorate.
4. Conspicuous warning inscriptions against opening the cover of the main enclosure or of any apparatus that gives access to the flameproof enclosures on live parts, or which is designed to receive cable attachment unless the supply to the unit is isolated at the source, shall be affixed permanently on the respective part to ensure that all live parts within the unit are made dead and safe.
5. Spare parts shall be made readily available to the user as and when required for proper maintenance of the equipment.
6. The customer shall be supplied a copy of this approval letter, the test report from the testing laboratory with the lab-certified drawing, an extract of the condition & special conditions, and the maintenance schedule, if any, recommended by the testing laboratory in their test report(s) so as to maintain safety features of apparatus/equipment.
7. The customer shall also be provided a copy of the factory test report along with drawings, an instruction manual on the installation, operation, and maintenance of the equipment, and a spare parts catalogue at the time of delivery of the equipment.
8. The user shall furnish the performance report of the equipment directly to this Directorate after one (01) year of actual use.
9. While seeking renewal, a valid BIS license in the case of Indian manufacturers and in the case of foreign manufacturers, QAR/QAN, as may be applicable shall be submitted and the same shall remain valid as long as the apparatus is manufactured and marketed.
10. Any modification to the equipment that might be considered necessary at a later date shall be effected upon being so directed by this Directorate.
11. The cables connecting with Equipment shall conform to the provisions of the DGMS Tech. Circular (Electrical) No. 12 dated 25.05.2015 and corrigendum vide DGMS Tech. Circular (Electrical) Approval No. 01 dated 19.02.2016 in addition to the special requirement, if any, specifically for the safe operation of the equipment.
12. All covers doors/access covers of the electrical equipment mounted on the equipment, on opening/removal which may explosive internal conductors, shall have warning instructions either by raised lettering or by other suitable means against such opening/removal of covers, doors, and access covers, without isolating supply of energy to the equipment from its source.
13. The plug and socket assembly affixed to the motors/panel if provided, will be so interlocked as to prevent removal of the plug from the socket while alive.
14. In the interest of safety, the OEM guidelines shall be adhered to and spares, supplied by OEM shall only be used while maintaining the apparatus. Spare parts shall be made readily available as and when required for proper equipment maintenance. Any failure in the equipment shall be intimated to this Directorate.
15. All sensing devices shall be regularly tested and, routinely calibrated or verified to ensure correct operation and a record of the same shall be maintained.
16. The associated items for which approval has been issued are exclusively for use as part of this equipment only and shall not be read as individual approval for those items.
17. The electrical equipment and cables associated with the machine shall be checked by the Electrical Supervisor of the mine for their respective flame proofness of the equipment and condition of cables at the beginning of each working shift and the findings thereof enter a bound-paged book maintained for that purpose which shall be duly signed by the Electrical Supervisor with the date.
18. In the event of any revision of standards applicable to the product/equipment, the manufacturer shall get the product/equipment tested as per revised standards and submit test reports to the customer for information and to this Directorate for further approval/renewal.
19. The cable entry devices, threaded adaptors, and stopping plugs shall be suitable for the equipment and be considered as a part of the equipment (not a component). The cable entry device and cabling methods used shall be suitable for their intended duty and for the special type of cable used in mining. Such cable entry devices shall be duly certified as per relevant IS/IEC standards.
20. The approval of the subject equipment is with regard to Ex-standards. Other relevant standards applicable for the assessment of its electrical parameters required under type tests have not been taken into consideration.
21. All circulars/general approvals issued by DGMS from time to time, relevant to the equipment shall also be complied with.
22. The relevant provisions of the Central Electricity Authority (Measures relating to Safety and Electric Supply) Regulations,2023 shall be complied with in all matters relating to the installation, operation, and maintenance of the equipment.
23. The approval is accorded for five years i.e. up to 08.01.2030.
24. At the time of applying for renewal, details of the supply, including the name of mines, purchase order, and date, shall be furnished with the application.
25. If at any time any of the conditions subject to which this approval has been granted, is violated, or not complied with, this approval shall be deemed to have been revoked with immediate effect.

The above approval may be amended or withdrawn at any time, if considered so necessary in the interest of safety, and is being issued without prejudice to any other provisions of law which may be or may become applicable at any time

Annexure-B

List of flameproof/Weatherproof/Intrinsically safe apparatus incorporated/associated with the Roof Bolter machine, Model JMS RB 30, conforming to conforming to IS/IEC 60079-0-2017, IS/IEC 60079-1-2014 and IS/IEC 60079-11-2011 manufactured by M/s. JMS Mining Pvt Ltd for use in belowground coal mines in India (DGMS APPROVAL NO.-846 of 2025).

Note: The power supply to the apparatus will be converted to an intrinsically safe power source to power the aforementioned intrinsically safe apparatus apparatus listed at slno.10 & 11 within one month from the date of issue of this approval and the complaine shall be submitted on this portal under this application ID.