Where double earthing is required? Is there any power
specification to have double earthing?
- 10 Answers
- 45136 Views
- Delphi, I also Faced
- E-Mail Answers
Answer Posted / prabhakaran
Double earthing is provided for critical equipments like transformer and generator were the earthing is essential. when one earth connection is correded or ineffective the other one will provide the connection to earth. if only one earth connection is provided if connection is not good the system become undgrounded.
| Is This Answer Correct ? | 19 Yes | 3 No |
Post New Answer View All Answers
limitation of conductor height on ground when we consider EMC
If I want to lift the water at a height 50m from ground level through two inch(diameter) metal pipe then what is the capacity of motor pump is required? is it possible in single phase supply or not?
Please send 110 kv sb station full single line drawing(sld)
In india, according to trade theory above 5 HP motor reqired star delta starter. But we R connect 11 KV motor with 14MW in Direct to line ( With VCB starter combination) Can U Guess, How it is possible ?????
We have given to 3phase supply to ups system & how can coming netural
A 3-phase IM is supplied from 50 Hz system. It runs at speed of 1440 rpm and slip equal to 4 %. Calculate number of pole pairs. A 1 B 6 C 2 D 3
what are the applications of transistors with low dc gain, high dc gain and medium dc gain( beta)?
1.what is difference between ATS & STS main use. 2.what is difference between ACB& VCB With symobles,and main partes, manimum range. 3.How many types of relays and main function.
Why are iron cores in transformers made laminated?
When we use air circuit breaker, it has O/L protection ,time delay SC protection, Instataneous SC protection & ground fault protection. They all have some setting range. But what is the suitable/allowable setting for the above protection which will be safe for the equipment? For example-O/L protection setting have a range of (0.4,0.45,0.5,0.55,0.6,0.65,0.7,0.8,0.9,1.0)xIn Time delay SC protection have a range of (1.25,1.5,2,3,4,6,8,10,12)xIn Time delay setting is 0.02,0.1,0.2,0.3,0.4 Instataneous setting is fixed to 20xIn Gound fault setting is given 100A,300A,600A,900A,1200A This setting are for 2500A ACB. So what will be the basic allowable setting for the above protection? is there any formulae to calculate this<
how to calculate the size of the HT cable
there are cam operated switches - why we call cam operated , What is cam ?
explain different types of d.c motors?
why the arc welding machines require parallel earthing systems? ie why each machines are connected to earth pit by separate wires during earthing? wats it adavantages?
Define resonant frequency?
