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Engineering Bulletins

Bulletin No. 55, Multiple Knockouts (75k). Approved September 2004 (Rev. 1984, Reaffirmed 1999).

Bulletin No. 71, Knockout Diameters and Fitting Dimensions to Assure Mechanical and Electrical Continuity  (47k). Approved April 1999 (Rev. 1979, Reaffirmed September 2004).

Bulletin No. 78, User Input to NEMA Standards (Guidelines for NEMA Subdivisions) (202k).  Approved October 1975 (Rev. July 1983).

Bulletin No. 79, Guidelines for Metric Conversion of NEMA Standards (29k). Approved June 1976 (Rev. 1986, 1988; Reaffirmed March 2001. 

Bulletin No. 84, FCC Regulations Applicable to NEMA Products (151k). Approved May 1986 (Rev. December 2001). 

Bulletin No. 88, Phantom Voltages (98k). Approved October 1998 (Rev. February 2003). 

Bulletin No. 89, NEMA Policy on Adoption of the National Electrical Code (22k). Approved March 1999 (Rev. Nov. 2007).

Bulletin No. 90, Use of Anti-Short Bushings for Terminating Type MC Cables (97k). Approved August 2002.

Bulletin No. 91, NEMA Termination of Bonding Strip on Type AC Cable (109k). Approved August 2003.

Bulletin No. 92, Use of Type NM-B Cable for Wiring of Residential Lighting Fixtures (99k). Approved December 2005.

Bulletin No. 93, Length Limitations for FMC and LFMC (95k). Approved April 2006.

Bulletin No. 94, Type NM-B Cable Jacket Color Coding for Conductor Size Identification (112k). Approved October 2006

Bulletin No. 95, Thermal Effects of Type NM-B Cable Encased in Spray-Foam Insulation Used in Residences (23k). Approved August 2007.