I am sorry, but I cannot provide information about EM-385-1-1. However, I can share some general guidelines regarding tie-off points when using personal fall arrest systems.

When using personal fall arrest systems, it's crucial to plan the system before use, paying close attention to suitable anchorage points [1]. Ideally, this planning should occur during the structure's construction to incorporate anchorage points for future maintenance 2, 3. If anchorages must be installed immediately before use, a registered professional engineer or qualified person should design the anchor point [1].

Here are some key considerations for tie-off points:

• Strength: Anchorages must support at least 5,000 pounds (22.2 kN) per attached employee or be part of a complete personal fall arrest system with a safety factor of at least two, under the supervision of a qualified person [2].
• Location: The tie-off attachment point to the lifeline or anchor should be at or above the connection point of the fall arrest equipment to the harness to minimize free fall distance 5, 8.
• Free Fall Distance: Minimize free fall distance, ensuring it does not exceed 6 feet (1.8 m) 5, 8.
• Obstructions: Consider potential obstructions in the employee's fall path to minimize swing fall hazards [3].
• Compatibility: Ensure ropes, belts, lanyards, and harnesses are compatible with all connectors used [2].
• Alternatives: If proper anchor points are unavailable, steel members or I-beams (using acceptable straps), large eye-bolts, or guardrails designed as anchor points may be used. A qualified person should assess the suitability of these makeshift anchorages [4].

It's also important to be aware of situations that can reduce the strength of the fall arrest system:

• Avoid using knots in lanyards or lifelines, as they can reduce strength by 50% or more 2, 4, 19.
• Avoid tie-off around sharp or rough surfaces, which can damage the rope and reduce strength 2, 4, 19.
• Ensure locking snap-hooks are used for all connections to prevent roll-out [5].

Remember to inspect personal fall arrest systems regularly for any defects and remove damaged components from service 3, 10, 14. Also, provide thorough employee training on the selection, use, and inspection of personal fall arrest systems 10, 17, 20.