TAKEDOWN & WRAPUP OF 6-750MCM WIRES AT I.D. FAN; EMPLOYEE HELD WIRE TO PROTECT MAN ON LADDER FROM GETTING KNOCKED OVER; WHEN WIRE WAS CUT DOWN, EMPLOYEE BENT OVER TO HOLD WIRE FROM HITTING LAD DER. EMPLOYEE FOLLOWED IT DOWN TO THE GROUND, CAUSING HIM TO BEND OVER AT THE WAIST, STRAINING HIS BACK.