Fall Arrest Blocks

A self-retracting lifeline keeps the line short at all times, so both the fall distance and the clearance needed underneath are much smaller than with a shock-absorbing lanyard. That makes it the usual answer where there is limited space below the working position.

Before choosing any fall arrest equipment, work out the clearance you actually have below the anchor and compare it to the manufacturer's stated requirement for the product. The figures vary between products, and this is the calculation most often skipped.

A standard block assumes the line runs vertically to an overhead anchor. If the line can pass over an edge — leading-edge work, or an anchor at foot level — you need a block specifically rated and tested for edge use.

Any block that has arrested a fall should be withdrawn from service and returned to the manufacturer or an authorised service centre. Internal damage is not visible from the outside.