Electrical Thumb Rules-(Part-7)

Overhead Conductor /Cable Size:

Voltage

Overhead Conductor

Cable Size

33 KV ACSR-Panther/Wolf/Dog , AAAC 150,185,300,400,240 mm2 Cable
11 KV ACSR-Dog/Recon/Rabbit , AAAC 120, 150,185,300 mm2 Cable
LT ACSR-Dog/Recon/Rabbit , AAC,AAAC 95,120, 150,185,300 mm2 Cable

 Transmission / Distribution Line:

Span

Height of Tower

400KV=400 Meter

400KV=30Meter (Base 8.8 Meter)

220KV=350 Meter

220KV=23Meter (Base 5.2 Meter)

132KV=335 Meter

220KV Double Circuit=28 Meter

66KV=210 Meter

66KV=13Meter

Conductor Ampere

Voltage wise Conductor

Dog=300Amp

400KV=Moose ACSR=500MVA Load

Panther=514Amp

220KV=Zebra ACSR=200MVA Load

Zebra=720Amp

132KV=Panther ACSR=75MVA Load

Rabbit=208Amp

66KV=Dog ACSR=50MVA Load

Moose=218Amp

 

 Type of Tower:

Type

Used

Angle/Deviation

A

Suspension Tower Up to 2°

B

Small Angle Tower 2° to 15°

C

Medium Angle Tower 15° to 30°

D

Large Angle / Dead End Tower 30° to 60° & Dead End

 Tower Swing Angle Clearance (Metal Part to Live Part):

Swing Angle

Live Part to Metal Part Clearance (mm)

66KV

132KV

220KV

400KV

915mm

1530mm

2130mm

3050mm

15°

915mm

1530mm

2130mm

22°

3050mm

30°

760mm

1370mm

1830mm

44°

1860mm

44°

610mm

1220mm

1675mm

 Cable Coding (IS 1554) 😦 A2XFY / FRLS / FRPVC / FRLA / PILC)

A

Aluminium

2X

XLPE

F

Flat Armoured

W

Wire Armoured

Y

Outer PVC Insulation Sheath

W

Steel Round Wire

WW

Steel double round wire Armoured

YY

Steel double Strip Armoured

FR

Fire Retardation

LS

Low Smoke

LA

Low Acid Gas Emission

WA

Non Magnetic round wire Armoured

FA

Non Magnetic Flat wire Armoured

FF

Double Steel Round Wire Armoured

 Corona Ring Size:

Voltage

Size

<170 KV 160mm Ring put at HV end
>170 KV 350mm Ring put at HV end
>275 KV 450mm Ring put at HV end & 350 mm Ring put at Earth end

 Load as per Sq.Ft:

Type of Load

Load/Sq.Ft

Diversity Factor

Industrial

1000 Watt/Sq.Ft

0.5

Commercial

30 Watt/Sq.Ft

0.8

Domestic

15 Watt/Sq.Ft

0.4

Lighting

15 Watt/Sq.Ft

0.8

  Size of Ventilation Shaft:

Height of Building in meter Size of ventilation shaft in sq meter Minimum size of shaft in meter

9.0

1.5

1.0

12.5

3.0

1.2

15 and above

4.0

1.5

 

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About Jignesh.Parmar
Jignesh Parmar has completed M.Tech (Power System Control), B.E(Electrical) from Gujarat University. He has more than 14 years experience in Power Transmission-Power Distribution-Electrical energy theft detection-Electrical Maintenance-Electrical Projects(Planning-Designing-coordination-Execution). He is Presently associate with one of the leading business group as a Deputy Manager at Ahmedabad,India. He is Freelancer Programmer of Advance Excel and design useful Excel Sheets of Electrical Engineering as per IS,NEC,IEC,IEEE codes. He is technical Author for "Electrical Mirror" and "Electrical India" Magazines. He is Technical Blogger and Familiar with English, Hindi, Gujarati, French languages. He wants to Share his experience & knowledge and help technical enthusiasts to find suitable solutions and updating themselves on various Engineering Topics.

13 Responses to Electrical Thumb Rules-(Part-7)

  1. Jignesh,
    Good coverage of transmission line parameters.
    Kindly add Tripple conductor “SNOWBIRD” in 400 kV line capacity (1500 MVA approx)
    Regards,

  2. tusharmahajan says:

    Dear sir,

    Wish U Happy VISHWAKARMA PUJA .

    Thanks

    Regards

    Tushar Mahajan.

  3. Ruid says:

    Sir, I want to know how to design for Ligtining protection of buildings, structures etc. Please kindly provide me the details,

    Thank
    Raj

  4. Doodi Brahmananda reddy says:

    Hi Sir,
    Thanks for your Valuable information.

  5. ashish choudhary says:

    gd notes

  6. mallikarjun says:

    Sir u have mentioned lightning load for domestic !%watts/sqf. if u dont mind may i know what r the things covered under lightning load ………PLZ

  7. mallikarjun says:

    Sir u have mentioned lightning load for domestic is 15watts/sqf. if u dont mind may i know what r the things covered under lightning load ………PLZ

  8. deepak goswami says:

    Dear Sir,

    Loas As per sq/ft. is considered only lighting or power kindly clear it. if possible what the electrical thumb rules considered. kindly brief in note what you want considered.

    Thanks & Regards,
    Deepak Goswami

  9. Animesh Mukherjee says:

    Good coverage

  10. Pingback: SK10 Cheap Solar Panel

  11. SUNIL SHARMA says:

    WHAT IS THE DERATING FACTOR FOR ACSR DOG 100MM2 CONDUCTORS

  12. AMIT says:

    HOW TO CALCULATE ALUMINIUM CABLE RATING IF LOAD VALUE IS KNOWN

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