NEMA

NEMA for Industrial Heaters

The National Electrical Manufacturers Association, also known as NEMA, is one of the most prestigious and preferred trade associations for electrical product manufacturers. Member companies manufacture products that are used in conjunction with the generation, distribution, transmission, use, control and storage of electricity. The products are used for medical, institutional, commercial, residential and industrial applications. NEMA standards deal with the manufacture, performance testing, application and rating of various electrical products.  The terminal boxes used on industrial electric heaters are typically given a NEMA rating to insure it meets the requirements of the environment where the heater will be installed.  NEMA defines the requirements for electrical enclosures under NEMA Standard Number 250.

Adhering to NEMA standards and using products that meet the standards affords various benefits to your organization or plant. They ensure that you are in a better position to select and acquire the products that meet your particular needs. You can also rely on products that meet the standards to be safe and interoperable. This eliminates the risk and worry that comes with using non-rated products. It results in you having more options and thus being able to get the maximum bang for your buck.

NEMAIt is therefore recommended that when you are looking at the various options you have when specifying an industrial heater, one of the deciding factors may be that the heater terminal enclosure meets NEMA standards. This ensures you have the best the market has to offer. Additionally, installation procedures are part of the standards. This means you can rest assured that the installation was properly done and will perform as expected when they are followed.

The NEMA rating of the heater’s terminal enclosure defines the types of environments in which the electrical enclosure can be used and signifies a fixed enclosure’s ability to withstand certain environmental conditions. All listed enclosure types provide protection to personnel from contacting enclosed equipment.  Additionally they provide the following;

  • Type 1 – Indoor use, protection against limited amounts of falling dirt.
  • Type 2 – Indoor use, protection against limited amounts of falling water and dirt.
  • Type 3 – Indoor or outdoor use, protection against rain, sleet, windblown dust and damage from external ice formation.
  • Type 3R – Indoor or outdoor use, protection against rain, sleet, and damage from external ice formation.
  • Type 3S – Indoor or outdoor use, protection against rain, sleet, windblown dust and to provide for operation of external mechanisms when ice laden.
  • Type 4 – Indoor or outdoor, protection against windblown dust and rain, splashing water, hose-directed water and damage from external ice formation.
  • Type 4X – Indoor or outdoor use, protection against corrosion, windblown dust and rain, splashing water, hose-directed water, and damage from external ice formation.
  • Type 5 – Indoor use, protection against settling airborne dust, falling dirt, and dripping non-corrosive liquids.
  • Type 6 – Indoor or outdoor use, protection against hose-directed water, and the entry of water during occasional temporary submersion at a limited depth and damage from external ice formation.
  • Type 6P – Indoor or outdoor use, protection against hose-directed water, the entry of water during prolonged submersion at a limited depth and damage from external ice formation.
  • Type 7 – Indoor use in locations classified as Class I, Division 1, Groups A, B, C or D hazardous locations as defined in the National Electric Code (NFPA 70) (Commonly referred to as explosion-proof).
  • Type 8 – Indoor or outdoor use in locations classified as Class I, Division 1, Groups A, B, C or D hazardous locations as defined in the National Electric Code (NFPA 70) (commonly referred to as explosion-proof).
  • Type 9 – Indoor use in locations classified as Class II, Division 1, Groups E, F and G hazardous locations as defined in the National Electric Code (NFPA 70) (commonly referred to as dust-ignition proof).
  • Type 10 – Intended to meet the applicable requirements of the Mine Safety and Health Administration (MSHA).
  • Type 12/12K – Indoor use, protection against circulating dust, falling dirt, and dripping non-corrosive liquids.
  • Type 13 – Indoor use, protection against dust, spraying of water, oil, and non-corrosive coolant.

NEMA standards and other related information for industrial heaters ensures that you get the best products and the best from them. You can rely on the quality of the products and know how they should be used and installed. For example, screw plug immersion heaters often come with a NEMA 1 or 4 housing  which provides the protection suited for most of the applications where they are used.

NEMA

To discuss  the correct NEMA terminal enclosure for your industrial heaters please contact AccuTherm by visiting us online www.accutherm.com.

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