ASC O5 Standards and Pole Test Data
Note: These ASC O5 Standards may be purchased as downloadable PDF files from the ANSI WebStore by clicking the links below:
Current O5 Standards:
| ANSI O5.1-2022 (Approved by ANSI - August 2022) |
Wood Poles: Specifications and Dimensions |
| ANSI O5.2-2025 (Approved by ANSI - September 2025) |
Wood Poles - Structural Glued Laminated Timber for Utility Structures |
| ANSI O5.3-2021 (Approved by ANSI - February 2021) |
Solid-Sawn Wood Crossarms, Braces, and Ground Wire Moulding: Specifications and Dimensions |
| ANSI O5 Wood Poles Package 2022 | This package of standards contains current editions of O5.1, O5.2, and O5.3 (check back for updated 2025 package when ANSI publishes) |
Withdrawn O5 Standards:
| ANSI O5.4-2017 (Withdrawn December 2021) |
Naturally Durable Hardwood Poles – Specifications and Dimensions (Withdrawn, but the historic version is still available) |
| ANSI O5.5-2010 (r2016) (Withdrawn December 2021) |
Wood Ground Wire Moulding - Specifications & Dimensions (Withdrawn, but the historic version is still available. Note that current ground wire moulding specifications can be found in ANSI O5.3, above) |
| ANSI O5.6-2010 (Withdrawn June 2019) |
Solid-Sawn Naturally Durable Hardwood Crossarms and Braces: Specifications and Dimensions (Withdrawn, but the historic version is still available) |
Alternatively, ASC O5's standards may be available from the following standards vendor:
The ASC O5 Operating Procedures are available for free download by clicking this link.
Pole Test Data
In the development of the O5 Standards, a database of wood pole test data was used. It was last updated on 30 May 2002 and includes data from EPRI 1,2,3,4,5,6
1 (Copyright © (1985). Electric Power Research Institute. EL-4109-V1. Wood Pole Properties, Volume 1: Background and Southern Pine Data. Reprinted with Permission.
2 (Copyright © (1986). Electric Power Research Institute. EL-4109-V2. Wood Pole Properties, Volume 2: Douglas Fir Data. Reprinted with Permission.
3 (Copyright © (1986). Electric Power Research Institute. EL-4109-V3. Wood Pole Properties, Volume 3: Western Red Cedar Data and Size Effect. Reprinted with Permission.
4 (Copyright © (1981). Electric Power Research Institute. EL-2040-V1. Probability-Based Design of Wood Transmission Structures. Reprinted with Permission.
5 (Copyright © (1981). Electric Power Research Institute. EL-2040-V2. Probability-Based Design of Wood Transmission Structures. Reprinted with Permission.
6 (Copyright © (1981). Electric Power Research Institute. EL-2040-V3. Probability-Based Design of Wood Transmission Structures. Reprinted with Permission.
Interpretations
August 30, 2022: Interpretation of ANSI O5.1-2017 Annex A (Informative). Available upon request.