(Running threads are made by cutting enough threads on a conduit so the entire coupling can be screwed on to the con. duits, resulting in loose joint with poor conductivity). In lieu of running threads, conduit unions shall be used. Couplings and connectors shall be made tight. They shall be of the water-tight type if buried in concrete, or fill, or installed in wet places. (bo) Factory ells and/or sweeps shall be used as required and available. quired, When field bends are re- the radius of the curve of the inner edge must be at least six times the internal diameter of the conduit when rubber and braid covered conductors are installed and not less than ten times the internal diameter of the conduit when lead covered conductors are to be installed. (c) Conduit shall be held in a vice while (a) Conduit shall be reamed after cutting. (e) Rigid galvanized conduit coated with (f) Where exposed overhead conduit is in- (g) Where conduit is indicated on plans for (h) Conduit shall be run as straight and being cut. Care must be taken to see that the cut is at a right angle to the side of the pipe. Cutting o11 shall be used when cutting threads or conduit. an asphaltic base paint shall be used for underground conduit runs where indicated on the plans. dicated on plans for buildings, aluminum conduit shall be used if available. If it is not available, galvanized conduit may be substituted. stations, rigid galvanized conduit shall be used. direct as possible. The contact of dissimilar metals through out the system shall be eliminated if practical to eliminate the possibility of galvanic action. (1) A run of conduit between outlet and out- let, between fitting and fitting, or between outlet and fit- ting shall not contain more than the equivalent of 4 quarter bends, including those bends located immediately at the outlet or fitting. 2. Conductors for Building Wiring: A complete system of copper conductors shall be installed in the race- way systems. Conductors smaller than No. 2 A.W.G. installed in ordinarily dry locations shall be rubber-insulated, 16-7 type