872558.2 (Obsolete) Solid Sawn Douglas Fir Crossarms Treated with PentachlorophenolSolid Sawn Douglas Fir Crossarms Treated with Pentachlorophenol

Click here for a PDF of this Material Standard

1. Scope

This specification covers the minimum requirements for selected solid sawn Douglas Fir distribution crossarms full length pressure treated with pentachlorophenol in oil preservative solution. Where there is conflict between this specification and any standards referred to herein, this specification shall govern. The crossarms purchased under this specification will be used in the construction of overhead electrical distribution systems.

2. Material ID Numbers and Crossarm Sizes

This specification applies to the following District crossarms:

			Dimensions
Material ID	Reference Figure	Type	Width (d)	Height (d)	Length (f)
872558	1	2-pin	3-3/4”	4-3/4”	7'
872566	2	4-pin	3-3/4”	5-3/4”	10'
873027	3	8-pin	3-3/4”	4-3/4”	11'
872160	4	6-pin	4-3/4”	5-3/4”	13'
5001063	--	4-pin	3-3/4”	5-3/4”	10'
Dimension Tolerances: (d) ± 1/8” (f) ± 1/4”

3. Reference Standards

Except as modified by this specification, the crossarms furnished under this specification shall comply with the pertinent parts of the latest revisions of the following standards.

ANSI O5.3	American National Standard for Wood Products - Solid Sawn-Wood Crossarms and Braces - Specifications and Dimensions
AWPA A3	Standard Methods for Determining Penetration of Preservatives and Fire Retardants
AWPA A5	Standard Methods for Analysis of Oil-Borne Preservatives
AWPA A9	Standard Method for Analysis of Treated Wood and Treating Solutions by X-Ray Spectroscopy
AWPA A11	Standard Method for Analysis of Treated Wood and Treating Solutions by Atomic Absorption Spectroscopy
AWPA P8	Standard for Oil-Borne Preservatives
AWPA P9	Standards for Solvents and Formulations for Organic Preservative Systems
AWPA M1	Standard for the Purchase of Treated Wood Products
AWPA M2	Standard for Inspection of Wood Products Treated with Preservatives
AWPA M3	Standard Quality Control Procedures for Wood Preserving Plants
AWPA M4	Standard for the Care of Preservative-Treated Wood Products
AWPA T1	Use Category System: Processing and Treatment Standards
AWPA U1	Use Category System: User Specification for Treated Wood
WCLIB No. 17	Grading Rules for West Coast Lumber

4. Definitions

ANSI	American National Standards Institute
AWPA	American Wood-Preservers' Association
WCLIB	West Coast Lumber Inspection Bureau

5. Material

All crossarms shall be manufactured from coastal Douglas fir grown in the West Coast region in accordance with ANSI O5.3 Section 12 and the applicable parts of WCLIB Standard Grading Rules No. 17. Material defects and seasoning requirements shall be in accordance with these standards.

6. Manufacture

6.1 Dimensions and Tolerances

All dimensions and tolerances shall conform to those shown on the drawings which are a part of this specification.

6.2 Pin and Bolt Holes

Pin and bolt holes shall be smoothly bored without undue splintering where bits break the surface. The center of any hole shall be within 1/8-inch of the centerline locations on the face in which it appears. The holes shall be perpendicular to the starting and finishing faces.

6.3 Shape

The shape of the crossarms at any cross section, except for permissible wane, shall be as shown on the drawings which are a part of this specification. The two top edges may be chamfered or rounded 3/8-inch radius. The two bottom edges may be slightly eased the entire length, 1/8-inch radius.

6.4 Incising

The lengthwise surfaces of crossarms shall be incised. The incisions shall be approximately 1/4-inch deep, shall be reasonably clean cut and their spacing pattern shall ensure uniform penetration of preservative.

6.5 Workmanship

All crossarms shall be of first quality workmanship. Crossarms shall be dressed on four sides.

6.6 End of Arm Plates

Yellow cedar crossarms shall have end of arm plates installed to reduce checking. Shakes, splits, or throughchecks at either end of the crossarm are not permitted except for those which are orthogonal to the pin holes and limited to 3 inches in length.

7. Marking

All crossarms shall be legibly and permanently marked or branded in accordance with ANSI O5.3, section 4. Markings shall include:

Manufacturer's name or symbol
Year of manufacture
Wood species designation "DF" for Douglas fir
Preservative designation "PA" for pentachlorophenol in petroleum (Type A)
Preservative retention in pounds per cubic foot of preservative

8. Treatment

8.1 Method

All crossarms treated under this specification shall be treated by a pressure process with pentachlorophenol to provide protection against insect attack and damage from decay.

8.2 Preservative

The only acceptable wood preservative shall be pentachlorophenol. The pentachlorophenol used to prepare wood preserving solutions shall contain not less than 95-percent chlorinated phenols and shall conform to AWPA Standard P8 when analyzed in accordance with AWPA Standard A5.

8.3 Solvents and Co-Solvents

The hydrocarbon solvents for introducing the preservative into the wood shall meet the requirements of AWPA Standard P9 Type A, determined in accordance with the reference ASTM standards for physical properties.

8.4 Penetration

Penetration by the preservative in Douglas fir crossarms shall be in accordance with AWPA Standard T1, 8.12, except as specified herein, as determined in accordance with AWPA Standard A3. Penetration shall be 100-percent of the sapwood. In the heartwood, penetration shall be not less than 2-1/2-inches longitudinally from the edge of holes and ends and not less than 3/16-inches deep from the surface of any incised face.

8.5 Retention

Retention of the preservative shall be 0.40 pounds per cubic foot as specified in AWPA U1, 6A.3.0, UC3A and UC3B and as determined in accordance with AWPA Standard A5 or A9.

8.6 Retreatment

Retreatment of crossarms, which initially do not meet the penetration and retention requirements of this specification, shall not be done more than twice in accordance with AWPA Standard T1, 6.

8.7 Cleanliness

After treatment, crossarms shall be reasonably clean to the touch, and shall remain so. Surfaces shall be free from tarry, greasy, or sticky material and from oil exudation.

9. Quality Control

In accordance with ANSI O5.3 section 7., inspection and determination of conformance to the requirements of this specification shall be performed by the manufacturer at the place of manufacture. The District, or a District representative, may also perform inspections at the place of manufacture, the treating plant or the delivery destination.

10. Rejection

Any crossarm found to be defective or nonconforming under this specification within 1-year after receipt by the District shall be rejected and shall be promptly replaced by the supplier at the supplier's expense.

11. Packaging

Crossarms shall be packaged in neat bundles. The bundles shall have spacer strips between each lay of arms and each bundle shall be securely bound with flat metal strapping. The District's purchasing documents shall specify the quantity of crossarms to be purchased as well as the quantity of crossarms per bundle.

12. Shipment

12.1

Shipment shall be:

FOB PUD No. 1 of Snohomish County
Operations Center Receiving
1802 75th St SW
Everett, WA 98203-6264

12.2

Crossarms shall be shipped on open flatbed trucks in a manner suitable for handling with a forklift. Shipping in enclosed vans is unacceptable.

13. Drawings

The crossarms furnished under this specification shall be shaped, dimensioned and framed in accordance with the drawings shown in Figures 1 through 4 on the following pages.