this is particularly important when carrying heavy loads or when climbing hills. if half the length of cable is exposed to the sun, then the entire length should be considered to be exposed to the sun. psalm 41 for the director of music. if you require technical assistance with any of our products, please contact our technical support team at 1-847-291-1590 and select option 1. we guarantee a call back within an hour of your phone call. i am supposed to have just one class today which will be unit operation of course. 