Construction Codebooks and Estimating Guides

+National Electrical Code Explanations

National Electrical Code Top Ten Tips:
Article 427, Fixed Electric Heating Equipment for Pipelines and Vessels

Please note, we do quote from copyrighted material. While the NFPA does allow such quotes, it does so only for the purposes of education regarding the National Electrical Code. This article is not a substitute for the NEC.

These are the 10 NEC Article 427 items we deem most important, based on the pervasiveness of confusion and the potential costs of same.

  1. Know the difference between Impedance, Inductance, Integrated, Resistance, Skin-effect and heating systems [427.2]. Each has its own installation requirements.
     
  2. Fixed heating systems for pipelines and vessels are always continuous loads. Normally, when you are using one you are using them all. It's not like the situation where you have mixed use loads that aren't normally run at max capacity at the same time--for example, 24 receptacles in an office area.
     
  3. Not all equipment that might be used for this purpose can be used for this purpose. Ensure that it's identified for the chemical, thermal, and physical environment. If in doubt, contact the manufacturer.
     
  4. Equipment identified for this purpose must be installed in a manner that doesn't violate its suitability for the purpose. Consult and follow the manufacturer's instructions.
     
  5. The requirements for resistance heating elements are not obvious, so you must consult Part III to know what they are.
     
  6. The requirements for impedance heating elements are not obvious, so you must consult Part IV to know what they are.
     
  7. The requirements for inductive heating elements are not obvious, so you must consult Part V to know what they are.
     
  8. The requirements for skin-effect heating elements are not obvious, so you must consult Part VI to know what they are.
     
  9. The rules for the disconnecting means changed with the adoption of the 2002 NEC. A controller can serve as the disconnect, if it conforms to 427.55 and 427.56(D).
     
  10. Article 427 does not provide separate requirements for overcurrent protection. You protect the heating equipment against overcurrent when you supply it by a branch circuit as specified in 210.3 and 210.23.

 

These courses will dramatically boost your proficiency with Chapter 4 requirements (click an image for more information):

NEC General Requirements Course, nec article 406, receptacles, training in the National Electrical Code, nec, national electrical code seminars, national electrical code books, national electrical code videos 2002 Electrical Theory Review, nec article 406, receptacles, training in the National Electrical Code, nec, national electrical code seminars, national electrical code books, national electrical code videos 2002 Theory Comprehensive Electrical Course, nec article 402, fixture wire requirements, nec requirements for fixture wires, National Electrical Code, training in the National Electrical Code, nec, national electrical code seminars, national electrical code books, national electrical code videos

 

Other Codes

More NFPA 70 Resources

 

 

These keywords may have brought you here: nec article 426, fixed outdoor electric deicing, snow-melting equipment, skin-effect heating systems, resistance heating system, impedance heating system, nec requirements for deicing systems, nec requirements for snow removal systems, National Electrical Code, training in the National Electrical Code, nec, national electrical code seminars, national electrical code books, national electrical code videos

Codebookcity is a subsidiary of Mindconnection, LLC When you follow the links from this site to the purchase area, you will go to the Mindconnection server. That server provides secure shopping, so you can buy your codebooks with confidence.

If you have any questions, comments, or concerns, please view the aboutus pages, or write to sales @ mindconnection.com. We do want your business.



Global View of code and further information concerning national
Secure FTPS (SSL) on the planet Go FTP FREE Client