Abstract: One form of sewer comprises a pipe having a bottom section 100 incorporating a flow channel 101 along which sewage flows. A cable guide 110 comprises a body section 111 and an arm section 112. The body comprises a panel 111 curved so as to be able to lie substantially flush with the walls of the flow channel 101 and the arm comprises a tube with an internal passage. The arm 112 projects from the body 111 and the passage within the arm 112 extends from an opening 113 provided in the body 111 to an opening 114 provided at the distal end of the arm 112. The openings 113, 114 and the passage within the arm 112 are of suitable dimensions to carry a cable 105. The body is also provided with a cable clip 115.

Abstract: A cable guide includes an upper face and a lower face. The lower face has a generally convex form so as to lie in contact with the flow channel when fitted in the flow channel. The upper face has a generally concave form and is shaped to minimize disturbance of the flow when fitted in the flow channel. A passage is defined between the lower face and the flow channel having an entrance opening at a first end of the cable guide and exit openings on the sides of the cable guide towards a second end. By utilizing a cable guide, disruption to the flow within the channel by the entrance or exit of the cable is minimized.