New connections Mains trenching and cable laying guide Read this along with the ‘Site information and customer requirements document’ provided with your build quotation. All work carried out must be compliant with our technical guidance (TG-PS-881) available from the SSEN website. It is also recommended that you review the ‘Practical guide to Streetworks’ before undertaking any excavations. Therefore it’s crucial that you contact your Team Manager to arrange a site visit before you start trenching. www.ssen.co.uk/CompetitionInConnections/G81Documents/ Practical guide to streetworks www.gov.uk/government/uploads/system/uploads/attachment_data/file/4382/practicalguidetostreetworks.pdf Please note: It’s up to you to supply us with finefill material such as builder soft sand (free of sharp stones and rocks etc) to blind our equipment. You will also be responsible for backfilling and reinstatement of the trenches, it is recommended that this is completed inline with the Specification for the Reinstatement of Openings in Highways 3rd edition (SROH 3rd) in all cases www.gov.uk/government/uploads/system/uploads/attachment_data/file/11042/sroh.pdf The following trench section shows the position of cable/duct in the ground. It is important that the top of any apparatus is at these depths as a minimum, this includes the top of the duct. In addition to the cable or duct there is a requirement for 75mm finefill material on all sides. Cable mark tape or tiels must be installed 150mm above the top of the apparatus, this needs to have SSEN branding on. This is available from our approved suppliers. See last page. Minimum Excavation depth required = (A) minimum depth of apparatus + (B) outside duct/cable size + (C) 75mm of sand bedding This table shows the minimum depths to top of apparatus (A within the diagram above) Minimum apparatus depth LV cables 11kV cables 33kV cables Unmade ground, verges and Footway (mm) 450 600 800 Carriageway (Road) (mm) Agricultural (mm) 600 750 900 1000 1000 1100 Please note that (M) represents the cable marker tile (for 33kV cables) or tape for all other installations (Please see TG-PS-881). Please note: Where there are sudden changes in surface type (e.g footway to carriageway), excavations should always be at the greater of the depths required. New housing service cable installation guide Experience has shown that by using a service tube the disturbance to the site is reduced when the supply is connected. The service tube can be laid in the same trench as the other services are shown, with an identifying plastic marker tape installed above, to give advanced warning of service cable location on private property. Vector illustration needed to edit External meter cabinets The external meter cabinets must be positioned in agreement with SSE to provide unrestricted access. The preformed ‘hockey sticks’ can be installed either within the cavity or clipped to the outer surface of the wall below the cabinet. White ‘hockey sticks’ must be used on the outer surface of walls. The service tubing must be securely coupled to the ‘hockey sticks’. Typical cross section of a service trench PLASTIC MARKER TAPE 300 150 The cabinets are only large enough for our equipment. You should fit your own main switches on an inside wall so that the length of interconnecting cable does not exceed 3m. This cable must only enter through the bottom of the cabinet, using the right hand hole, when viewed from the front. ELECTRICITY TELECOM WATER GAS Installation of ducts For the installation of ducted schemes the use of Black electric ducts only (see table on last page for approved suppliers) are permitted for use. You should think about the type of ducts you plan to use be before ordering as your excavations will be different depending on which duct supplier you use. You will also need to review the minimum cable bending radius by referring to the manufactures specification. Emtelle supply smooth bore ducts which have rigid preformed bends at differing angles. It is however important that angles bends and not placed too close together otherwise pulling tensions will become greater than the manufactures guidelines during the installation process. Bell mouth roller Winch Cable installation All cable must be installed not exceeding the manufacture recommended pulling tensions. You should familiarise yourself with these loads before hiring the equipment to ensure that these loads are no exceeded. For all Cable pull you should have; • Winch • A display of the pulling tension on the winch (calibrated) • A free moving swivel • Rollers (every 4 metres and/or where cable would come into contact with ground) • Cable socking to ensure good grip of cable In Addition For ducted schemes you will also need; • Bell mouth roller • Lubricant • Cable drum trailer for each drum For single core cables it’s recommended that you put colour indicators on each cable. You will need to securely anchor the drums and the winch at either end and ensure that the cable does not come into contact with any thing that can damage the cable sheath. Approved Suppliers The following supplier’s materials are approved for use on SSEPD network. Item LV Concentric cables LV Wavecon cables 11kV Three core cables Manufacturer Tratos Cabelte Prysmian Hellenic Nexans Prysmian Manufacturing location Notes UK Portugal Wrexham UK Greece Hannover, Germany Wrexham UK AL stranded and solid conductors Tele-Fonica Kable Prysmian Poland Wrexham UK Cu or Al Stranded for all sizes. Nexans Hanover, Germany Solid AL up to and including 300 mm² NKT Tele-Fonica Kable Prysmian Cologne, Germany Nexans Hanover, Germany POLYPIPE CIVIL LTD UK EMTELLE UK LTD UK Cable tile Cable warning tape CENTRIFORCE CENTRIFORCE UK Plastic tape tile CENTRIFORCE UK 100 mm wide. when laid by plough TE Connectivity UK Rayflate products WT Henley UK Service ducts (green plastic compound) UK Denso mastic Denso tape UK RISE sealant system 11kV Single core cables 33kV single core cables Cable duct Duct sealant Winn & Coates (Denso) CSD Sealing System Poland Wrexham UK Cu or Al Stranded for all sizes or Solid Al up to and including 300 mm² UK Got a question? Contact your Team Manager. This guide incorporates the NJUG recommendations that Scottish and Southern Electricity Networks have adopted for ‘Service entries for new dwellings on residential estates’.