Medium Voltage Cable Installation Standards

These tests are intended to detect any manufacturing transport and.

Medium voltage cable installation standards.

The text and pictures below highlight the more important aspects of the installation of cable accessories from the point of view of their effect on system reliability. As defined by the ieee 400 standard cable tests are defined as. As a specialist mv cable supplier our standard medium voltage cable portfolio contains cable with single and 3 core copper or aluminium conductors with a steel wire armour or aluminium wire armour for mechanical protection and with various application specific materials including polyvinyl chloride pvc polyethylene pe cross linked polyethylene xlpe and ethylene propylene rubber epr. Cables shall be laid directly on ground on 10 cm minimum soft sand and ground will be back filled properly avoiding any aggregate with sharp edges for damaging the cable.

Cables should not be installed at ambient temperatures. Types of cable tests. For armoured cables pulling tension kg 5kg total cross section of conductors for unarmoured cables. Standardisedcable installation depth to minimum cover of750 mm and maximum depth of 1500mm section 14 9 added section 14 10 clarified marker tape and protective cover requirements section 14 11 clarified cable sealing exposed cables and terminated cables requirements section 14 13 14 14 and 14 15.

Single and three core medium voltage cables according to international standard iec 60502 1 8 3 3 6 kv cables xlpe insulated pvc or pe sheathed xlpe insulated screened pvc or pe sheathed cables for voltages up to and including 36 kv. High voltage withstand testing 39 time leakage test 41. Field diagnostic tests can be performed on cable systems during various stages of their operating life. Medium voltage underground cables 4 cable l cable power circuit design 7 n conductor 7 8 n conductor screen 8 n insulation 8 n insulation screen 8 9 n metallic screen 9 10 n outer protective sheath 10 11 l table of cable eleents 1 l cable constructions 1 l cable drus 1 l cable tests following production 1 accessories l introduction 1 l connectors and lugs 1.

Added section on live end. Insulated bundled overhead conductors torsade 12 20 24 kv xlpe technical information formulae. Conducted after the cable is installed but before any accessories joints splices and terminations are installed. What is the permissible leakage current value for a 11kv cable if there any formula for calculating leakage current cable rated voltage 8 7 to 15 kv 2070 meter length ac hi pot test kit applied volt.

Cable pulling tension during installation the cable pulling tension during installation can be estimated by the following formula. The writers of this document hope that it will be found both useful and interesting and that it will contribute to the increasing reliability of medium voltage networks. Consult applicable information provided by national standards cable manufacturers and accessory and other suppliers.