Interested to Buy Any Domain ? << Click Here >> for more details...
why there is a fault occurs, if a phase wire touches ground..
and the fault not occurs when we connect a bulb between phase
and ground..??
- 1 Answers
- 3662 Views
- I also Faced
- E-Mail Answers
Answer Posted / 7anoter4
Let's say the cable supplying the outlet [phase-neutral-
ground] is 3*14 awg copper and the length up to supply
panel is 300 ft. The conductor resistance is about 1 ohm[at
rated temperature].For 120 V voltage supply at panel if the
phase contact the grounding conductor the current will be
120/2=60 A. A 15A fuse will burn in less than 1 sec.
However, usually the short circuit current is 500-1000A.
If a bulb is connected between phase and ground ,for a 100
w bulb 120 V the resistance will be 120*120/100=144 ohm.
The current will be 120/144=0.83 A.
| Is This Answer Correct ? | 7 Yes | 0 No |
Post New Answer View All Answers
is IS says that neutral should be brought to switch box. and this one is a recomended practice
being an electrical engineer why you wanna come into software i have an very good academics what answer i have to give
HOW CAN WE DECIDE THE SUPPLY VOLTAGE FOR MOTOR ACCORDING TO ITS RATING(IF ANYONE KNOWS GIVE IT WITH EXAMPLE AND ITS CALCULATIONS)
Why in metering Ct for ammeters ct secondary side is grounded for each Ct but not in case of CBCT (Core balance current transformer)..kindly some1 highlights the reason..is it because net flux is zero?
what are the industrail measures to over ferranti effect? how would the ferranti effect the power system if those remedial mearsure arent taken? how often does this effect occurs in real power system?
How to find ampere on ht side for selection of cable size ???
Anybody know how schematic diagram for reverse power relay? RPR for generator protection
How to decide and select the different earthing wire size for the different types of earthing
why ahould you show client/engineer activities clearly on the project plan
how invertor convert the dc into ac give brif detail
explain transformer ct connection?
what is the difference between 50 hz freq. and 60 hz freq.? which is better and economic in them ?
i am going to correct power factor of 1600kw induction motor,when i calculate capacitance of capacitor it is three time more in star connection than delta. if motor is star connected which connection i shall adopt for capacitors and reason for adopt this connection
What is the de rating factor of cable? What is the importance of the de rating factor in cable selection?
why h parameter are called as hybrid parameter?
