CABLE INSTALLATION USING OPTICAL DETECTION

A device for use with a conduit having a first conduit end and a conduit second end, into which conduit a cable can be installed using a flow of air into the first conduit end, the device being suitable for confirming that the flow of air is exiting the second conduit end, the device comprising - a housing (20), - means to enable connection of the device to the second conduit end, - a light source (31), - a detector (35) arranged to detect a presence or absence of a light signal, and - a light shield (26), wherein in use, the flow of air entering the device causes the light shield (26) and at least one of the light source (31) or the detector (35), to move to and to stay at a position relative to the other, permitting the detector to detect detections comprising one or more of - a presence or absence of the light signal, - an intensity level of the light signal, - a change in the presence or absence of the light signal, or - a change in the intensity level of the light signal.