The diameter on the markers used on extensive catenary wires across canyons, lakes, rivers, etc., should not be less than 30″
The 20″ markers are permitted on less extensive power lines or on power lines below 50 feet above the ground and within 1500 feet of an airport runway end.
20″ Part # WM-1
30″ Part # WM-3
Certified Distributor of Tana Wire Markers
“AMA has bought Rotating Beacons exclusively from Manairco since the late 1980s and we have enjoyed a highly successful track record because both companies are focussed on long term relationships with their customers as well as with their vendors and partners”