A safety arrangement for use with a piece of equipment, the safety arrangement comprising: a signal generating unit (10) for generating an optical signal; an elongate element (12) to be disposed along, about, around or through the piece of equipment (1), the elongate element being capable of transmitting an optical signal; and a signal detecting (11) unit for detecting an optical signal; the signal generating unit (10) being connected to the signal detecting unit (11) by the elongate element (12), such that the signal detecting unit (11) is in optical communication with the signal generating unit (10), the signal detecting unit (11) being arranged to detect a change in the optical signal transmitted by the elongate element (12) as a consequence of movement of the elongate element (12) and, upon detection of the change in the signal, the detecting unit (11) is configured to effect a change in the operation of the piece of equipment (1).