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Fuse


Introduction

A fuse is an overcurrent protective device containing a calibrated current-carrying member that melts and opens a circuit under specified overcurrent conditions.

The NEMA Fuse Section develops technical standards and serves as the industry voice for positively impacting product safety and performance requirements, and relevant government relations and trade activities.

Section Scope

The scope of the NEMA Fuse Section includes the following:

1. Non-renewable plug fuses.

2. Non-renewable cartridge fuses, not exceeding 1000 volts AC 1200 volts DC or less.

3. Renewable cartridge fuses and renewal links or elements, 600 volts or less.

4. Fuse holders and fuse blocks.

5. Excluded are all other types, such as miscellaneous and special purpose fuses.

Technical Activities

Introduction

A major driver of the NEMA Fuse Section is its ongoing standards and technical work. This is because standards play a vital part in the design, production, and distribution of products both domestically and internationally.

Sound technical standards for fuses benefit the end user, as well as the manufacturer, by improving safety, bringing about economies in product, eliminating misunderstandings between the manufacturer and purchaser, and assisting the pur­chaser in selecting and obtaining the proper product for their particular need.

Technical Committee agenda

The following lists key activities in the 2011 work program for the Fuse Section Technical Committee:

1. Maintaining NEMA FU 1
2. Establishing industry positions on relevant UL standards
3. Conveying industry positions through the 2014 National Electrical Code development cycle
4. Drafting of amendments to the trinational standard for low voltage fuses, through CANENA.
5. Assisting NECA in approving NECA/NEIS fuse application and installation guidelines as an American National Standard.
6. Establishing positions on IEC standards through the United States National Committee to the IEC.

Relevant Standards and Publications

NEMA standards and publications relevant to the fuse industry include:

NEMA FU 1-2002, Low Voltage Cartridge Fuses

NEMA Guidelines for Water Damaged Electrical Equipment

UL standards relevant to the fuse industry include:

UL 248/CSA C22.2 No. 248/NMX-J-248-ANCE series of standards for low-voltage fuses
(a trinational standard for North America)

UL 4248/CSA C22.2 No. 4248/NMX-J-4248 series of standards for fuseholders
(a trinational standard for North America)

UL 198M
Mine-Duty Fuses

Go here for UL Guide Card information on low voltage fuses made to UL 248.

Government Relations

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 Environment, Health & Safety; 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.

Membership

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 membership visit Joining NEMA.

 

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Related Standards