The National Electrical Contractors Association (NECA), Bethesda, Md., has published the tenth volume of its growing series of National Electrical Installation Standards. NECA 101-2001, “Standard for Installing Steel Conduits,” describes installation procedures for three common types of tubular steel raceways: rigid metal conduit, intermediate metal conduit, and electrical metallic tubing. Procedures described in the standard include threading and bending steel conduits and special considerations for installing PVC-coated steel conduit. The standard also contains an appendix dealing with the use of steel conduits as grounding electrode conductors for electrical feeders and branch circuits. NECA 101-2001 was developed in partnership with the Steel Tubing Institute of North America, based in Mentor, Ohio.
Guidelines for Installing Steel Conduit Tubing. Identified (for use). As defined in the NEC. NOTE: For the purposes of this Guideline the product has been evaluated for a specific purpose, environment or application and written documentation or labeling verifying this exists. Penetration firestop system. A listed assemblage. National Electrical Installation Standards™ (NEIS®) are designed to improve communication among speci- fiers, purchasers, and suppliers of electrical construc- tion services. They define a minimum baseline of quality and workmanship for installing electrical prod- ucts and systems. NEIS are intended to be referenced.
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What is the proper application of NEC Article 110.14(C)(1)(b)? 110.14(C)(1)(b) reads as follows: 'Termination provisions of equipment for circuits rated for over 100 amperes, or marked for conductors greater than 1 AWG, shall be used only for one of the following:' The 'or' in this article yields two greatly different results. Based on the first part any device of 100 ampere (110 amps) we use the 75 degree column in Table 310.15 (B) and 2 AWG is sufficient, but the 'or' part of the statement requires a 1/0 AWG conductor before we use the 75 degree column in Table 310.15 (B).
Under the 'or' part of the rule for a 110 amp device we use a 1 AWG under the 60 degree column of Table 310.15(B) and we need to use 1/0 AWG for 125 amp devices; since #1/0 AWG is rated for 125 amperes at 60 degrees C and 1 AWG cannot be rated used for the 75 degrees C. Any clarification on this article is appreciated.