Follow Our FB Page << CircleMedia.in >> for Daily Laughter. We Post Funny, Viral, Comedy Videos, Memes, Vines...

how to calculate no. of earthing pits and their diamensions?
no. of lightning arrester rods which are required to
protect a building of 35 mtr and we calculate?

Answers were Sorted based on User's Feedback

how to calculate no. of earthing pits and their diamensions? no. of lightning arrester rods which a..

to determine the no.of earthing pits required is depends
uponn the area required to dissipate the fault courrent to
the area of pipe electrode.
To protect 35M building , 1no. of lightning arrestor is
sufficient however better to provide two nos.of down
conductors hence to protect the building if any one
conductor fails.

 Is This Answer Correct ? 29 Yes 7 No

how to calculate no. of earthing pits and their diamensions? no. of lightning arrester rods which a..

The LE installed on the Top of 35 mtrs high building covers
the redial distance of 35 mtrs across the LE on ground
level so the no. of LE not only depend on Height of the
building but the others dimensions of the buildings.

 Is This Answer Correct ? 11 Yes 1 No

how to calculate no. of earthing pits and their diamensions? no. of lightning arrester rods which a..

The number of earthing pits depends on the soil resistance.
We may require earth resistance of 1ohm or 3 ohms at the
most. To get this we will have to install at least 2 pits
and as per parallel formula i.e. 1/r1+1/r2+1/r3= 1/R. We
have to keep on increasing the number of earth pits till we
get the required value for R=1 or 3 as per requirement.

 Is This Answer Correct ? 14 Yes 6 No

how to calculate no. of earthing pits and their diamensions? no. of lightning arrester rods which a..

it is depends on what extent you need the safety level.

 Is This Answer Correct ? 0 Yes 2 No

how to calculate no. of earthing pits and their diamensions? no. of lightning arrester rods which a..

Normally the area which is covered by a lighting arrester
calculated on the basis of PYTHAGAROUS statement.

In a right angled triangle, the sum of sqr.root of the
adjacent and opposite sides is equal to the sqr root of the
third side.

In the question asked the height is 35 meters. based on the
above we have to calculate the required datas.

 Is This Answer Correct ? 15 Yes 34 No

More Electrical Engineering Interview Questions

If i want to build 230kv substation what are the equipments to be installed?

What is Torque Vector Control in VVVF Drives?

If load current is 70amps or 50amps what range of CT to install for ampere metering

why secondary of c.t. will kept open ?

How to get Electrical Supervisory Licence in chennai Tamil Nadu from TNEB. I am BE EEE graduate.

We have AC-transformer 110/13.8kv,40MVA.If DC-Voltage=110kv is applied in its primary what will happen?

what is full form of google

why co incidence factor considered in transformer sizing?

what happends when an isolater is operated on on-load

Which level of the Transformer oil got dielectric strengh? And why?

HOW COULD A SINGLE PHASE INDUCTION MOTOR ROTATE IN OPPOSITE DIRECTION???

what is grounding & what is the value of groumding rod 2.5m?

Categories
• Civil Engineering (5076)
• Mechanical Engineering (4445)
• Electrical Engineering (16606)
• Electronics Communications (3915)
• Chemical Engineering (1092)
• Aeronautical Engineering (214)
• Bio Engineering (96)
• Metallurgy (361)
• Industrial Engineering (258)
• Instrumentation (2992)
• Automobile Engineering (332)
• Mechatronics Engineering (97)
• Marine Engineering (123)
• Power Plant Engineering (172)
• Textile Engineering (575)
• Production Engineering (0)
• Satellite Systems Engineering (106)
• Engineering AllOther (1378)