Indian Standard Code-Abstract (IS:5613/IS:5039/IS:11892/IS:1455/IS:11171.
INDIAN STANDARD CODE-ABSTRACT (IS:5613/IS:5039/IS:11892/IS:1455/IS:11171
Abstract of IS : 5613 for HV Line
Overhead Line Pole Foundation hole should be drilled in the ground with the use of earth-augers. However, if earth-augers are not available a dog pit of the size I.2 x O.6 m should be made in the direction of the line. The depth of the pit shall be in accordance-with the length of the pole to be planted in the ground as given in respective Indian Standards. Tublar Pole Steel Tubular Poles, Rolled Steel Joists and Rails – A suitable pad of cement concrete, stone or steel shall be provided at the bottom of the pit, before the metallic pole is erected. Where metal works are likely to get corroded ( points where the pole emerges out of the ground ), a cement concrete muff, 20 cm above and 20 cm below the ground with sloping top shall be provided. RCC Pole RCC poles generally have larger cross-section than the PCC poles and, therefore, the base plates or muffing are usually not provided for these types of poles. However, for PCC poles, a base plate ( 40 x 40 x 7 cm concrete block ) shall be provided. Cement concrete muff with sloping top may also be provided, 20 cm above and 20 cm below-the ground level, when the ground or local conditions call for the same. H.V Line
(120m To 160m Span)
The insulators should be attached to the poles directly with the help of ‘D’ type or other suitable clamps in case of vertical configuration of conductors or be attached to the cross arms with the help of pins in case of horizontal configuration. H.V Line
(120m To 160m Span)
Pin insulator and recommended for use on straight runs and up to maximum of 10’ deviation. H.V Line
(120m To 160m Span)
The disc insulators are intended for use a pole positions having more than 30’ angle or for dead ending of I1 kV lines. H.V Line
(120m To 160m Span)
For lines having=A bend of 10” to 30’, either double cross arms or disc insulators should be used for HT lines up to 11 kV. For low and medium voltage line, shackle insulators should be used H.V Line
(120m To 160m Span)
For Vertical configuration for Conductor erection: Distance between Pole’s Top to Disc insulation=200mm.
Between Disc insulator to Disc Insulator=1000mm.
Between Disc insulator to Guy Wire=500mm.
Stay Wire Angle with Pole Overhead lines supports at angles and terminal positions should be well stayed with stay wire, rod, etc. The angle between the pole and the wire should be about 45” and in no case should be less than 30”. If the site conditions are such that an angle or more than 30“ between the pole and the stay wire cannot be obtained, special stays such as, foot stay, flying stay or struts may be used Stay Wire Hard drawn galvanized steel wires should be used as stay wires.
The tensile strength of these wires shall not be less than 70 kgf/mm2. Only standard wires should be used for staying purpose.
Stay Rod Mild steel rods should be used for stay rods. The tensile strength of these rods shall not be less than 42 kgf/mm2 Stay Anchor Stays should be anchored either by providing base plates of suitable dimensions or by providing angle iron or rail anchors of suitable dimensions and lengths. Guy Insulator Stay wires and rods should be connected to the pole with a porcelain guy insulator. Wooden insulators should not be used. Suitable clamps should be used to coMeCt stay wires and rods to its anchor. For low and -medium voltage lines a porcelain guy insulator should be inserted in the stay wire at a height of 3 m vertically above the ground level. For high voltage lines, however, the stays may be directly anchored. Stay Setting The inclination of stay relative to the ground is roughly determined before making the hole for excavation. This enables the position of the stay hole to be fixed so -that when the stay is set, the stay rod will have the correct inclination and will come out of the ground at the correct distance from the pole. The stay rods should be securely fixed to the ground by means of a suitable anchor O/H Conductor Drum In loading, transportation and unloading conductor drums should be protected against injury. The conductor drums should never be dropped and may be Tolled only as indicated by the arrow on the drum side. The drums should be distributed along the route at distance approximately equal to the length of the conductor wound on the drum. Binding of O/H Conductor The insulators should be bound with the line conductors with the help of copper binding wire in case of copper conductors, galvanized iron binding wire for galvanized iron conductors and aluminum binding wire or tape for aluminum and steelinforced aluminum conductors ( ACSR ). The size of the binding wire shall not be ‘less than 2 mm” Different Voltage on Same Support Where conductors forming parts of systems at different voltages are erected on the same supports. Adequate cl…