1. ABB Ltd.
2. Bharat Heavy Electricals Limited
3. CG Power & Industrial Solutions Ltd.
4. Crompton Greaves Consumer Electricals Limited
5. Eaton Corporation PLC
6. Elliott Industries Inc.
7. Elmelin Ltd.
8. General Electric Company
9. Hitachi
Ltd.
10. HSP Hochspannungsger?te GmbH
11. Hubbell Incorporated
12. LAPP Insulators GmbH by PFISTERER Holding SE
13. Megger Group Limited
14. Mehru Electrical & Mechanical Engineers (P) Ltd.
15. Mitsubishi Electric Corporation
16. Nanjing Electric International Co. Ltd.
17. Nanjing Rainbow Electric Co. Ltd.
18. Newell Porcelain
19. Nexans
20. NGK Insulators
Ltd.
21. PPC Insulators by PHI ASSET MANAGEMENT PARTNERS
S.G.E.I.C. S.A.
22. Preformed Line Products
23. SEDIVER SAS
24. Siemens AG
25. TE Connectivity Corporation
26. The H-J Family of Companies
27. Toshiba Corporation
28. Warco Inc.
29. Webster-Wilkinson Ltd.
30. Weidmann Holding AG