Where -48 volt DC use & why?????????
- 10 Answers
- 29094 Views
- Ericsson, INDUS, Indus Towers, Telecom, I also Faced
- E-Mail Answers
Answer Posted / subra
in -48v dc system positive + is earthed. Negative- is
giving to the equipment.Normally in automobile dc system
negative is earthed.positive is giving to equipment.in
positive grounding system we can avoid corrossion on
terminals.
| Is This Answer Correct ? | 15 Yes | 3 No |
Post New Answer View All Answers
How many types of oil using in H/T & L/T Oil Circuit Breakers. need Explenation ?
if two transformers are placed parallel & both have fault impedance of 50KA will it increase or decrease show example?
how to find the torque of the single phase synchronous motor by doing an experiment
What are the internal and external faults?
Why back emf used for a dc motor? Highlight its significance.
With a phasor diagram show the effect of increasing the field current of a generator supplying a constant real power and connected to a grid system.
what is the pulse and audio frequency transformer? what is different between induction regulators and tap changing transformer?
What willbe change in programming when we use 5/3 solenoid inplace of 5/2 in operating of a cylinder?
how to calculate voltage drop and followed by cable calculation?is there avail in formula?
What is the formula for calculating impedance of transformers connected parallel at fault level 50KA?
There is any especial requirement for motor to drive through with VFD?
What are the reasons for the parallel operation of transformers?
How do you select the pickup value of the relay?
I need a formula to calculate the size of cable as per load but in the terms of length. Please Reply me as i search lot of sites but i did not get the answer.
When we have earthing mesh or underground earthing network in industrial plants, weather we have NT-S or NT-C-S kind of earthing system, so eventually weather we must use 4 or 5 wire in 400 volt level (For example 3×150+70 mm2 or 5×150 mm2) in this connection I would like to know exactly the paragraph of IEC or IEEE number
