Page 93 - McWane Poles Sales Manual 2024

Sales Manual • 2024
93
2.2 Topcoat
A. A topcoat is optional as ductile iron has an extreme high resistance to corrosion under most
service conditions. If the order so specifies a topcoat, that coating shall begin at the top of the
barrier coat (below grade coating) and extend upwards over the entire pole.
B. The topcoat shall be a combination of arc applied zinc and an acrylic barrier coat. The arc-applied
zinc shall be deposited to a minimum coverage equivalent to 0.08 grams per square inch of
exterior surface per ISO 8179.
C. The acrylic barrier coat shall be applied to a minimum 4 mils thickness. The topcoat is applied
to exterior surfaces only. The topcoat shall not overlap the ceramic epoxy barrier coat. The
topcoat must be capable of protecting centrifugally cast ductile iron and shall have the following
performance characteristics when applied to ductile iron:
2.3 Grounding Plates
A. Integrated conformal grounding plates shall be provided at the customer’s request. These
grounding plates shall conform to the NESC Rule 94 requirements for material and surface area
(288 square inches minimum).
B. Grounding plates for ductile iron poles shall conform to either one of the two ductile iron material
specifications listed above. The grounding plates shall be coated with an arc applied zinc for
additional corrosion protection. This zinc shall be applied at a rate no less than 0.08 grams per
square inch.
C. Grounding plates shall be affixed to the ductile iron pole by at least two 1/2 inch threaded holes.
Test Duration Results
Salt Fog ASTM B-117 Scribed Panel 1,000 hrs No Undercutting
No Rust
Humidity 100% Relative Humidity Direct
Condensation 150ºF 300 hrs No Blistering
Exterior Exposure Heavy Industrial Atmosphere 16 years No Rusting
Impact Resistance 130 inch/lbs Passed
Chemical Resistance Spot Test Distilled Water 50%
Sodium Hydroxide Propylene Glycol Motor Oil 300 hrs No Effect