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Extra resources for Nfpa 79 Electrical Standard For Industrial Machinery
Sample text
1 General This clause applies to grounded circuits and the protective or grounding circuit of the equipment. The grounding circuit consists of conductors, structural parts of the electrical equipment and machine, or both, that are all electrically connected or bonded together at a common point. 1 Conductors used for grounding and bonding purposes shall be copper. Stipulations on stranding and flexing as outlined in this standard shall apply. 6). 2 Grounding conductors shall be insulated, covered, or bare and shall be protected against physical damage.
49). 1 Pressure connectors shall be used to connect conductors to devices with lug-type terminals that are not equipped with saddle straps or equivalent means of retaining conductor strands. Exception No. 2). Exception No. 2: Wire-wrapped connections shall be permitted to be used where circumstances permit and where applied by use of a tool specifically recommended for the purpose. 2 Soldered connections shall conform to the following: — For manually soldered connections, rosin shall be used as flux.
6 Special conductors such as RG-/U transmission cable shall be permitted where necessary for the proper functioning of the equipment. 01222 Nonflexing (ASTM class) 7(‘) 10(K) 16(K) 19(C) 19(C) 19(C) 19(C) 19(C) 19(C) 19(C) 19(C) 19(C) 19(B) 19(B) 19(B) 19(B) 19(B) 37(B) 37(B) 37(B) 37(B) 37(B) 37(B) 61(B) 61(B) 61(B) 61(B) 61(B) 61(B) 61(B) Flexing (ASTM class) 7(‘) 10(K) 16(K) 26(K) 41(K) 65(K) 104(K) (\) (\) (\) (\) (\) (\) (\) (\) (\) (\) (\) (\) (\) (\) (\) (\) (\) (\) (\) (\) (\) (\) (\) Constant Flex (ASTM class/AWG size) 19(M/34) 26(M/34) 41(M/34) 65(M/34) 41(K/30) 65(K/30) 104(K/30) (–) (–) (–) (–) (–) (–) (–) (–) (–) (–) (–) (–) (–) (–) (–) (–) (–) (–) (–) (–) (–) (–) (–) (B, C, K) ASTM Class designation B and C per ASTM B8, Class designation K per ASTM B 174.