Indian Standard Code-Abstract (IS:1554/IS:15652/IS:1678/IS:1255/IS:694

INDIAN STANDARD CODE-ABSTRACT (IS:1554/IS:15652/IS:1678/IS:1255/IS:694

Abstract of IS 1554

Insulation Color (up to 11 KV) For reduced neutral conductors, the insulation color shall be black Arrangement of Marking (up to 11 KV)

For cables having more than 5 cores, the core identification may be done by numbers. In that case, the insulation of cores shall be of the same color and numbered sequentially, starting with number 1 for the inner layer. The numbers shall be printed in Hindu-Arabic numerals on the outer surface of the cores. All the numbers shall be of the same color which shall contrast with the color of the insulation. The numerals shall be legible. When the number is a single numeral, a dash shall be placed underneath it. If the number consists of two numerals, these shall be disposed one below the other and a dash placed below the lower numeral. The spacing between consecutive numbers shall not exceed 50 mm. Type of Armor (up to 11 KV)

Where the calculated diameter below armoring does not exceed 13 mm, the armor shall consist of galvanized round steel wires. Where the calculateddiameter below armoring is greater than 13 mm, the armor shall consist of either galvanized round steel wires or galvanized steel strips. Cable Identification/ Marking (up to 11 KV)

Type of Cable Legend: (i) Improved fire performance or Category C1 FR ( Cables in constrained areas, Does not propagate fire even when installed in groups in vertical ducts),(ii) Improved fire performance for Category C2 FR—LSH (Cables in constrained areas with limited human activity and/or presence of sophisticated systems) Aluminum conductor= A,

PVC insulation=Y,

Steel round wire armor= W,

Steel strip armor= F,

Steel double round wire armor= WW,

Steel double strip armor =FF,

PVC outer sheath= Y

Insulating Rubber Mat Four classes of mats, covered under this standard nd differing in electrical characteristics for different use voltages are designated Insulating Rubber Mat Class = AC (Rms)KV=DC(V)=Thickness(mm)

A=3.3=240= 2.0

B=11= 240=2.5 C=33=240=3.0

D =66= 240=3.5

Insulating Rubber Mat Most of all classes hall be resistant to acid and oil and low temperagre and shall be identified by the respective class symbol. However a category with special property of resistance to extreme ‘low’ ternperature will be identified by a subscript’s ‘to, the ‘respective “c” Class symbol Insulating Rubber Mat Roll of Mat shall be in multiple Length of of 5000mm and ion width of 1000mm.Standard Shape in length of 1000, 2000, 3000mm. Insulating Rubber Mat Leakage current for all Class of Mat shall not be more than 10 Micro Amp.

Abstract of IS: 15652 for Insulating Mat

Insulating Rubber Mat

Class AC Voltage DC Voltage Thicknes Class A AC (Rms)KV=3.3 DC(V) =240 2.0mm Class B AC (Rms)KV=11 DC(V) =240 2.5mm Class C AC (Rms)KV=33 DC(V) =240 3.0mm Class D AC (Rms)KV=66 DC(V) =240 3.5mm Class A AC (Rms)KV=3.3 DC(V) =240 2.0mm Resistance Most of all classes hall be resistant to acid and oil and low temperature and shall be identified by the respective class symbol. However a category with special property of resistance to extreme ‘low’ ternperature will be identified by a subscript’S ‘to, the ‘respective “C” Class symbol. Length Roll of Mat shall be in multiple Length of 5000mm and ion width of 1000mm.Standard Shape in length of 1000, 2000, 3000mm. In Case of Mat in Roll It shall be min 1m X 1m. Leakage current Leakage current for all Class of Mat shall not be more than 10 Micro Amp.

Abstract of IS: 1678 for Pole

PCC Pole Class of Pole Length of Pole Min Ultimate Transverse Load Class 1 17 Meter 3000 Kg Class 2 17 Meter 2300 Kg Class 3 17 Meter 1800 Kg Class 4 17 Meter 1400 Kg Class 5 16 Meter 1100 Kg Class 6 12.5 Meter 1000 Kg Class 7 12 Meter 800 Kg Class 8 12 Meter 700 Kg Class 9 11Meter 450 Kg Class 10 9 Meter 300 Kg Class 11 7.5Meter 200 Kg PCC Pole Tolerance Tolerance: The tolerance of overall length of the poles shall be + 15 mm. The tolerance on cross-sectional dimensions shall be + 3 mm. The tolerance on cross-sectional dimensions shall be + 3 mm. The tolerance on uprightness of the pole shall be 0.5 per cent PCC Pole depth in Ground:

Length of Pole Min depth in ground 6 Meter To 7.5 Meter 1.2 Meter 8 Meter To 9 Meter 1.5 Meter 9.5 Meter To 11 Meter 1.8 Meter 11.5 Meter To 13 Meter 2.0 Meter 13.5 Meter To 14.5 Meter 2.2 Meter 15 Meter To 16.5 Meter 2.3 Meter 17 Meter 2.4 Meter

Abstract of IS :1255 for Installation of Cable

Cable Route Indicator (Up to 33KV) Power cable route indicators should be provided at an interval not exceeding 200 M and also at turning points of the power cable route wherever practicable Cable Corrosion

(Up to 33KV)

Electrolytic corrosion: Where the possibility of electrolytic corrosion exists, for example, adjacent to dc traction system, the potential gradient along the pipe-line and the cable sheath should be speci…