Safety clamp A safety clamp for use in a fall arrest system is disclosed. The safety clamp comprises a body portion formed with a plate section having a plane, and a plate portion having a plane. The body portion and the plate portion together define a passage for receiving a safety rail. The plate portion is pivotable relative to the body portion between a first and a second position. The first position is wherein the plane of the plate portion is at an angle relative to the plane of the plate section such that the passage is open along its length to enable a safety rail to be inserted into, or removed from, the passage, at any location along the length of the safety rail. The second position is wherein the plane of the plate portion is substantially parallel to the plane of the body portion such that a safety rail can be retained within the passage. The safety clamp further comprises an actuating member that is at least partially located between the plate section and the plate portion. The actuating member is pivotally attached to the plate section of the body portion.