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High Voltage Insulator

The High Voltage Insulator Section, part of the NEMA Power Equipment Division, is heavily involved with domestic and international technical activities, including ANSI C29 Standards, ANSI C29 Secretariat, and IEC TC36 TAG.

The product links to the left and the links to the right provide the following information for specific products as well as this product area:

  • Manufacturers
  • Standards and application guides
  • Staff contacts
  • related information

Scope (Excerpt)

High Voltage Insulator Section

(Also see Outdoor High-Voltage Switches Voting Classification)

1. Insulators or insulating parts of wet-process porcelain or toughened glass, or non-ceramic

Click here for detailed product scope information.

The mission of the section is to develop product standards and advocate technical and industry positions that are in the best interests of the industry, member companies, and the users of their products throughout North America and the world. The section accomplishes its mission through active, effective, and organized marketing and technical programs, and related activities.

Section activities focus on these products:

  • Insulators or insulating parts of wet-process porcelain or toughened glass, or non-ceramic composites, whether or not assembled with metal parts, used in the transmission or distribution of electrical energy or for use as a part of a large electrical machine or piece of equipment (excluding assembled bushings and tubes used in secondary wiring at voltages not in excess of 440 volts and excluding fiberglass guy strain insulators).
  • Clamps, fittings and accessory hardware used directly with such insulators or insulating parts and/or affecting their functioning, except crossarm pins, bus clamps and pillar insulator spacers.

Technical Activities

Standards play a vital part in the design, production, and distribution of products destined for both national and international com­merce. Sound technical standards benefit the user, as well as the manufacturer, by improving safety, bringing about economies in product, eliminating misunderstandings between manufacturer and purchaser, and assisting the pur­chaser in selecting and obtaining the proper product for his particular need.

NEMA devotes much of its time, effort, and resources to voluntary standardization activities. NEMA standards are offered and recommended to become American National Standards under the procedures of the American National Standards Institute, usually under the canvass method. This decision rests with the particular subdivision or subdivisions concerned. NEMA standards are also often submitted for consideration as IEC standards components or references. It is the intent of the association to continue its support of these, and many more, activities as the best method to continue providing sound and safe electrical products for the use of all.

Key technical activities include working on:

  • ANSI C29.11 Standards for Composite Insulators Test Methods
  • ANSI C29.17 Standards for Insulator Composite-Line Post Types
  • ANSI C29.19 Standard for Outdoor Post Type Apparatus Insulators
  • 8-HV Technical Committee
  • ASC C29 Secretariat
  • IEC TC36 TAG

Government Affairs

Through NEMA, the section develops industry positions on legislative and regulatory initiatives that may affect member products, markets, and customers. NEMA's work has resulted in contributions to public policy development and in promoting competitiveness, technological progress, and public safety. On the Government Affairs homepage members can search for and e-mail federal representatives to convey opinions regarding energy policy or other issues related to the electroindustry.

NEMA Government Affairs provides specific services to its members and information in the areas of Environmental Stewardship; Energy; and International Trade & Commerce.

Market Economics

Through NEMA, member companies are able to develop and implement tailored, industry-specific market and statistical programs that benefit participating companies. Reports may include:

  • Product orders and sales
  • Market forecasting
  • Shipments by trading areas
  • Channels of distribution
  • Financial and operating ratios
  • Wages and benefits
  • Foreign trade

The association also conducts economic analyses on the impact of legislation and regulations on member products, and monitors and reports on key industry market indicators. All programs comply with NEMA statistical confidentiality policies. For more information, please see Business & Economy.

Among the many NEMA statistical reports available to members, the section participates in the following reports:

  • Monthly High Voltage Insulators and Hardware Report S-333
  • Wage and Personnel Practices Survey for High Voltage Insulators S-811


Membership in NEMA is open to any firm actively engaged in the manufacture in North America of a product within the NEMA scope and for sale in the open market. Membership of foreign firms is subject to product section policies and NEMA Board of Governors approval.

NEMA operates on a fee-for-service basis. Each product section establishes its projects and activities and approves an annual operating budget.

For more information on joining NEMA or this section, please see the membership center.

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