Wheatland Tube Company - Page 13

Wheatland TUBE COMPANY DIVISION OF JOHN MANEELY COMPANY

Fire and Casualty Hazards

Each contractor shall submit proof that the conduit proposed under this specification conforms to UL6. The UL listing mark may be accepted as evidence that the conduit conforms to this requirement.

Marking

Conduit shall be permanently marked in accordance with ANSI C80.1 and UL6.

Workmanship

All threaded portions of conduit shall be clean and undamaged. Plastic thread protectors shall be furnished on all exposed conduit threads. The exterior zinc coating, and all other protective coatings, including the interior coating and thread coating, shall completely and uniformly cover the metal substrate.

AMERICAN NATIONAL STANDARD INSTITUTE SPECIFICATION FOR ZINC-COATED RIGID STEEL CONDUIT

The ANSI Specification C80.1 is very precise and explicit in setting standards for rigid steel conduit. Wheatland's rigid steel conduit matches these standards in every way. It meets the general requirements of having an accurate circular cross section, a uniform wall thickness, a defect-free interior surface and continuously welded seams. It is thoroughly cleaned before coating so the protective coating adheres well and is smooth. The exterior surface is thoroughly and evenly coated with metallic zinc applied directly to the steel so that metal-to-metal contact and galvanic protection against corrosion are provided. The interior sur-

face is protected by zinc for corrosion resistance.

DETAILED REQUIREMENTS

Some of the pertinent detailed requirements of Specification C80.1 are interpreted and summarized below for your reference and assurance that Wheatland Rigid Steel Conduit is produced to precise standards.

Zinc Coating

The zinc content of the coating on the outside surface shall be equivalent to a minimum thickness of 0.0008 inches.

Threading and Chamfering

Each length of conduit shall be threaded on both ends, and each end shall be chamfered or otherwise treated to remove burrs and sharp edges. If threads are cut after the zinc coating has been applied, the threads shall be treated with a protective coating to prevent corrosion before installation. This treatment shall not impair electrical continuity through couplings or fittings after installation.

Identification

Each length of conduit shall be identified with the manufacturer's name and trade mark and the words "Rigid Steel Conduit."

Threads

The number of threads per inch and the length of the threaded portion at each end of each length conduit shall be as shown in the accompanying table and shall conform to American Standard Pipe Threads. The perfect thread shall be tapered for its entire length, and the taper shall be 3/4 in/ft.

Dimensions of Threads for Rigid Steel Conduit, Zinc Coated