A-A-50552
3.2 Materials. Materials used shall be free from defects which would adversely affect the performance or maintainability components or of the overall assembly.
3.2.1 Steel fabricators. The steel used in fabrication shall be from kinks, sharp bands, and other conditions which would be deleterious to the finished product. Manufacturing processes shall not reduce the strength of the steel to a value less than intended by the design. Manufacturing processes shall not be done neatly and accurately. All bands shall be made by controlled means to ensure uniformity of size and shape.
3.3 Finish. Fittings shall have surfaces which are not chipped, warped, cracked, or blistered. Surfaces which are normally in contact with conductor insulation shall be rounded to prevent abrasion or cutting of insulating material.
3.4 Threads. External and internal pipe threads shall be of the American Standard straight or taper type.
3.5 Box connector. Box connector shall be provided with a clamp or means for connecting to the conduit or cable and a hub and locknut arrangement, or a UL or CSA approved equivalent, for connecting to outlet boxes through standard conduit knockouts. Connectors without locknuts shall be limited to circuits under 250 volts unless tested and UL listed for the purpose. Connectors that have tapered thread for threaded hubs need not have locknuts. Clamps shall neither pierce the armor, damage the insulation of cables, nor distort or damage the conduit when accomplishing its normal function.
Attachment means shall provide an effective electrical bond between joint metallic parts. Minimum hub size on connectors shall fit standard ½ - inch conduit knockouts. All other connectors shall fit standard conduit knockouts. Screws shall be of the fillister head type, except where required by fitting design; roundhead or washer head type screws may be used. The clamps or clamping means for attaching flexible conduit, armored cable, nonmetallic sheathed cable to the connector shall provide adequate opening and clamping range to fulfill holding and bending requirements as specified in UL 514B and NEMA FB 1. Connectors without lookouts shall be limited to circuits under 250 volts.
3.6 Sleeves and bushings. Antishort sleeves and insulating bushings shall be unaffected by ordinary atmospheric condition and be so formed that they shall not be distorted or dislodged by ordinary handling when secured in place.
3.7 Coupling and adapters. Coupling and adapters shall have a positive attachment means at each end and shall provide effective electrical bond between joined metallic parts. Coupling and adapter sizes indicated by a single dimension are for use with the same size conduit on each end.
3.8 Grounding clamps. Ground clamps shall meet construction and test requirement of UL 467.
4. REGULATORY REQUIREMENTS.
4.1 Materials. The offeror/contractor is encouraged to use recovered materials to the maximum extent practicable, in accordance with paragraph 23 403 of the Federal Acquisition Regulation (FAR). Unless otherwise specified herein, all
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