1. (a) Use. Rigid metal conduit shall be permitted to be used under all atmospheric conditions and occupancies, provided conduits and fittings exposed to the weather or to severe corrosive influences are of corrosion-resistant material or have coatings inside and outside suitable for the conditions. Where dissimilar metals are used, they shall be joined by an approved device or method.

   (Title 24, Part 3, Section 3-346-1.)

2. (b) Running Threads. Running threads shall not be used.

   (Title 24, Part 3, Section 3-346-9(b).)

3. (c) Support. Conduit shall be supported at least every 10 feet. However, rigid metallic runs of conduit made up with approved threaded couplings and uninterrupted by pull boxes shall be permitted to be secured in accordance with Table 2, provided such fastening prevents transmission of stresses to terminus when conduit is deflected between supports.

   Table 2761

   Conduit Size

   Maximum Distance Between Conduit Supports

   ½ inch

   10 feet

   ¾ inch

   10 feet

   1 inch

   12 feet

   1 ¼ inch

   14 feet

   1 ½ inch

   14 feet

   2 inch

   16 feet

   2 ½ inch

   16 feet

   3 inch and larger

   20 feet

   (Title 24, Part 3, Section 3-346-12.)

Note: Authority cited: Section 142.3, Labor Code. Reference: Section 142.3, Labor Code; and Section 18943(c), Health and Safety Code.

History

1. Editorial correction filed 11-2-83 (Register 83, No. 45).

2. Amendment filed 12-10-87; operative 1-9-88 (Register 88, No. 1).