Answer / william lobo.

Actually this question should be posted in instrumentation
questions. Nevertheless the answer goes like this. Normal
earthing is connected with the electrical apparatus in the
PIB ( Plant interface building) or any such building
wherein instuments or electronic equipment are installed.
The earthing of these electronic equipment are connected to
a different earthing system which consists of a flat plate
with insulators. From here the earthing goes direct to a
seperate earthing pit and thence the other end of the
earthing pit may then be connected to the ground bus. Never
are any electronic earth connected to the electrical earth
or these electronic sensitive equipment will get damaged.

Answer / kamyar

Dedicated earthing system which is related to sensitive instrument and electronic is known as clean earth system. Althogh for many years engineers by advising standards separate clean earth from dirty (power) earth but nowadays it should be connected togrther at least in one point. The reason is "bonding".

Answer / loboreliance2003

In instrument language the above answer is for the clean
earth system. But the normal electrical earthing system is
termed as dirty earth to which only the housing of the
electronic devices. eg. panels, enclosures,boxes, etc are
connected to the dirty earth.
But the electronic devices etc are earthed to the clean
earth systems only.

Rccb trip or not with out neutral connect in three phase welding machine

1 Answers  

---

What will happen if DC supply is given on the primary of a transformer?

6 Answers  

---

explain the existence of reactive power in electrical engg?when it generates?

1 Answers  

---

What is the mmf,rgt and ngt please brief completely

0 Answers   cpgn,

---

what is wave traps and why it is been used in switchyards?

1 Answers   NHPC,

---

How to calculate flow of water delivered by pump when pressure & size of pipe line is given

0 Answers   Knight Frank,

---

model question paper for supervisor trainee

0 Answers   Bhel,

---

you have an automatic voltage regulator at home for your appliances,if the voltage in your area drops from 220v to 190v,does the output of the automatic voltage regulator drops?or does it retains the 220v output?

4 Answers  

---

what is the purpose of interpose t/f in control and relay ckts?

2 Answers  

---

WHY THAT THREE COLORS CHOOSEN IN 3 PHASE? WHAT IS MEAN BY RYB?

2 Answers  

---

Is only insulation the difference between High voltage and Medium voltage cable?

1 Answers  

---

how to calculate units consumption for a 12 hp motor /hr.

0 Answers  

---