Other System Considerations Deflection The standard design deflection does not exceed 1/500 of the span. Systems can be designed to meet any higher customer requirement. Ceiling Mounted bridge cranes are intended for normal industrial environments and are rated for moderate usage, which can be defined as: Working Conditions Operational time up to 100% of the work period and loads being lifted up to 50%, or below, the rated capacity. Or, operational time less than 50% of the work period and loads being lifted are greater than 50% of the rated capacity. Applications involving vacuums, magnets or other high impact lifters can be classified as severe usage (continuous service) and may require special design considerations. Please contact our sales office representative for advice. Maximum support spacing for the gantry shall not exeed: