Transcription of BULLETIN - NEMA
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1 ENGINEERING DEPARTMENT BULLETIN No. 71 June 1965 Revised September 9, 2004 (Reaffirmed 12/2011) KNOCKOUT DIAMETERS AND FITTING DIMENSIONS TO ASSURE MECHANICAL AND ELECTRICAL CONTINUITY INTRODUCTION: The Joint Sections Committee on Knockout Diameters and Fitting Dimensions reviewed the existing industry practices and standards for knockout diameters and conduit fittings, and developed a table of dimensional relationships which assure no opening in the enclosure at the conduit entrance under normal conditions.
1 engineering department bulletin no. 71 june 1965 revised september 9, 2004 (reaffirmed 12/2011) knockout diameters and fitting dimensions to assure mechanical and electrical continuity
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