Phone: (033) 2475 0026 / 2498 0688


This is the manufacturing unit of JD Group. The State of the Art facility is spread over an area, covering 1.6 acres of land, fully equipped with modern engineering equipments and testing facilities. It is located at Vill. Samali, Bakrahat Road, P.O. Nahazari , PS Bishnupur Dist : 24 parganas (South)West Bengal.


The company manufactures various types of LT & HT Panels, Auto Changeover, Inverters and Servo Voltage Stabilizers. The products are tested and certified under CPRI and NTH. It is an ISO 9001-2008 company under NSIC & SSI (EM-II). JDEP’s products are marketed through its Sales and Associate Network throughout India and abroad. It has successfully executed many critical & prestigious orders received from various esteemed organizations. JDEP believes in providing quality products delivered on time, with precise design and engineering, stringent quality check matched with prompt and dedicated after sales service for customer delight.


  • Production Process

  • Testing and QAP

  • Machineries Used

Production Process

Fabrication Process:

This process is the basic step of panel manufacturing, here the metal sheets, which come in the form of long sheet of Metals are cut, bended and welded to provide a particular shape and structure of the panel.


  1. Precision tools and machineries are used to cut the sheet metals.
  2. Sheets are used of reputed brands like Tata, JSW and Century.
  3. Precision tools are used for cutting and bending and CNC is used for bolted panels
  4. Design team is engaged to meet customer’s need following IS rules and value engineering in accordance to customer demands.
  5. Each item is fabricated as per client’s GA design, maintaining IS standard.


Passivation and Powder Coating Process:

9 Tank Process The panels which are through with fabrication are subjected to the following combination of steps of cleaning namely- (Degreasing, Water Rinse, De-Rusting, Water Rinse, Activation, Phosphating, Water Rinse, Passivation):


  1. Degreasing: In this stage, the component is freed of grease, oil and other unwanted contaminants like dirt adhering to its surface. This is done by dipping the panels in caustic bath and thus it removes the oil and grease component from the raw steel sheet.
  2. Water Rinse I: This is done by spraying running water on the material surface thereby removing the caustic residue.
  3. De-Rusting: This is done by dipping the panels in acid bath. Rusts are cleaned and etching is created on the sheet which ensures firm grip of the paints with sheet.
  4. Water Rinse II: The above operation is followed by one or two water rinses to remove all traces of acid.
  5. Surface Activation: Room Temperature Process, For-Activating the Sheet Metal Surface for Zn & Mn phosphate Coating by Activation Chemicals
  6. Phosphating: Room Temperature Process, For-Smooth & Uniform Coating of Sheet Metal Surface with Zn Phosphate by Zinc Phosphate Solution. This is done manually by dipping in phosphate chamber to prevent absorbing moisture on the sheet.
  7. Water Rinse III: This is done by spraying running water on the material thereby removing the excess phospating chemical.
  8. Passivation: Room Temperature Process, For-Sealing Pores of Sheet Metal Surface for obtaining Maximum Corrosion Resistance over Phosphate Coating by Decxylite Solution.


Regular maintenance of each tank is done to match stringent parameters of chemical strength and regular testing of the chemicals is done through titration process.


  1. Oven Drying: After the above 9 tank process Oven Drying is carried out at around 120-130 Deg C, for- Drying Sheet Metal Parts by hot air.
  2. Powder Coating: Powder Coating is a dry finishing process which ensures a high-quality, durable finish, allowing for maximized production, improved efficiencies, and simplified environmental compliance and is carried out within 24 hrs of Oven Drying. Sheet Metal parts are coated with Powder of shade desired by client through Spraying in Spray Booths, and then Epoxy-Powder Coated/Sprayed Sheet Metal parts are baked in Electrically Fired Oven at 150-180 deg C.


Assembly & wring

The next process is a technical and engineering process where the various components are fitted, fixed and wiring is done for the panels as per requirement of the client. Specified switchgears are used for achieving the desired working logic of the panels according to the approved design of the client.


  1. All panels are manufactured as per IS standard of different aspects.
  2. Value addition and suggestion to the clients are provided by our design engineering team.
  3. Done according to the circuit diagram developed by our design team and approved by the client.
  4. Switchgears are checked as per QAP for proper functioning of the panels.


Testing and QAP

The testing is done by Quality Engineers to check the panels as per all specifications, safety norms and quality aspects. The company possesses fully equipped test facilities for in-house voltage transformer, current transformer, various switches, contactors, overload relay etc., measuring instruments like Voltmeter and ammeters, electronic components like transistors, diodes, ICs, resistance and other semi-conductor devices.


Testing Equipment


Machineries Used