BCW consists of .054â€ stainless steel control wire with a tensile strength of at least 200,000 lbs. that is encapsulated in 1/16â€ flexible galvanized spiral wire sheath. Stainless steel sheath is an option. BCW can be ordered from the factory cut to length, but when distance between the damper and the location of the controller is uncertain, you can order it in bulk lengths and cut it in the field. Standard bulk length is 50â€™, but 100â€™ lengths can be special ordered. Damper runs should not exceed 50â€™.