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PLS-POLE REA Crossarm Components

This is a compilation of two documents. The first 10 crossarms listed (Types 01 - 05, single and double) are REA/RUS "distribution" crossarms. The dimensions and drilling guide (geometry) were taken from REA 1728F-803, Page W2.1G. (which happen to match the Hughes Brothers catalog, Pages A-5 and A-6). The rest of the crossarms duplicate the properties of the REA Bulletin 1724E-200 document, Page G-2, with some from Page 13-3.

Both single and double crossarm configurations are modeled with the assumption that the maximum dimension is in the vertical direction, with double crossarms placed on each side of the pole. The increased section modulus and moment of inertia due to the separation of the arms is based on the diameter at the tip of a class 6 pole which is 5.41 inches. The engineer should adjust this accordingly for smaller poles, which are rarely used. It is conservative to use this assumption for all poles class 6 and larger, but they can be increased should a higher capacity in the longitudinal direction be desired (spacing has no effect on the vertical capacity).

Due to numerous requests from users all over the world, we have recently introduced a reduction in the moment of inertia and section modulus properties due to a single bolt hole in the horizontal direction. It was assumed that this bolt hole will be 13/16" in diameter, which again, should be conservative for most applications.

The crossarms were assumed to be of Douglas Fir variety, with a Modulus of Elasticity of 1920 ksi, a Design Normal Stress of 7400 psi, and weight of 48 lbs/ft3. Again, these values should be adjusted by the engineer should other properties be required.

The supplied crossarms library file is based on the following equations. Should any of the parameters need to be changed from those detailed above, these equations can be used to calculate new properties.

Click on REA Crossarm Components Library to download the library.

Please note: Power Line Systems cannot provide a copy of REA bulletins, or any other standards or material for that matter, as these standards are copyrighted. We suggest RUS to download PDF copies of REA documents.

LEGAL DISCLAIMER: These files are being provided on an "as-is" basis. Neither Power Line Systems, Inc., nor the various manufacturers accept responsibility for the accuracy herein, and the end user is ultimately responsible for the verification of all data.