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C. Galvanized rigid steel (GRS) shall be used on exposed installations in general purpose areas. d. Rigid Schedule 40 PVC shall be used for conduits embedded in concrete slab on grade and above grade. e. Rigid Schedule 40 PVC shall be used for area lighting circuits and may not be concrete encased. f. Galvanized rigid steel shall be used in exposed installations in outdoor areas. 2. Exposed Raceways: a. Conduits shall be rigidly supported with clamps, hangers, and Unistrut channels. b. Intervals between supports shall be in accordance with the National Electric Code. C. Conduit Terminations: Empty conduit terminations not in pullboxes shall be plugged. Exposed raceway shall be installed perpendicular or parallel to buildings except where otherwise shown. Conduit shall be terminated with flush couplings at exposed concrete surfaces. Metallic raceways installed below -grade or in outdoor locations and in concrete shall be made up with a conductive waterproof compound applied to threaded joints. Compound shall be Zinc Clads Primer Coatings No. B69A45, HTL-4 by Crouse - Hinds, Kopr Shield by Thomas & Betts, or approved equal. D. Conduit Installations 1. Where a run of concealed PVC conduit becomes exposed, a transition to rigid steel conduit is required. Such transition shall be accomplished by means of a factory elbow or a minimum 3 -foot length of rigid steel conduit, either terminating at the exposed concrete surface with a flush coupling. Piercing of concrete walls by non - metallic runs shall be accomplished by means of a short steel nipple terminating with flush couplings. 2. Connections shall be made using flexible liquid -tight conduit. Equipment subject to vibration or movement that is normally provided with wiring leads, such as solenoid valves, shall be installed with a cast junction box for the make -up of connections. Flexible conduits shall be as manufactured by American Brass, Cablec, Electroflex, or approved equal. 3. Conduit penetrations on walls and concrete structures shall be performed in accordance with the following: a. Seal all raceways entering structures at the first box or outlet with oakum or suitable plastic expandable compound to prevent the entrance into the structure of gases, liquids, or rodents. City of Santa Ana Conduit Security Management System Project Page 16111 -5 SantaAna_SMS_16111