Interested to Buy Any Domain ? << Click Here >> for more details...
What are the difference between C-Curve and D-Curve for
MCB's.
- 17 Answers
- 190933 Views
- ABB, DLF, Essar, GK companies, Nissi Engineering Solution, I also Faced
- E-Mail Answers
Answer Posted / bright spark
There is no A type.
B C and D types all consist of 2 similar parts:
The thermal trip, this is the same for all MCBs of the same
rating eg 6A.
The Magnetic trip, this is where the difference is.
B C and Ds have an increasing degree of initial "tolerance"
to overload.
B types have a limit of 3 - 5 times the rating.
e.g. a 6A MCB would trip with a surge of 18-30A.
C types have a limit of 5 - 10 times the rating.
e.g. a 6A MCB would trip with a surge of 30 - 60A.
D types have a limit of 10 - 20 times the rating.
e.g. a 6A MCB would trip with a surge of 60 - 120A.
Now you would think that the B curve would be the safest,
and it is, but not very tolerant of power surges. If you
have quite a few lights on in the house and switch on
another, this can be enough for that initial start up surge
to trip you whole lighting ring, and a reset at you consumer
unit. B types are notorious for this, but ideal for a ring
final where you don't have too many outlets, gives ideal
protection.
As you can see a type D 6A MCB can tolerate a 120A surge, so
a 32A Type D would tolerate an initial surge of 320 - 640A
before tripping!. Domestic Consumer Units will have a master
trip of @60 - 100A (80A is most common), hence why there is
never a need for type D in the domestic environment, not
unless you have a 3 phase incomer and have a car production
line in your back garden instead of a washing line!.
| Is This Answer Correct ? | 205 Yes | 17 No |
Post New Answer View All Answers
1. How many types of mangers? 2.How many types of capacitors? 3.pls tell me normally types alternator problems?
Dear sir, I have completed DECE in the year 1995. I have work experience in HT and LT LINE more than five years. Now i am doing BE in EEE from rajasthan university. After completion of BE,can i apply "C" Licence sir? Please reply.
WHAT IS THE FORMULA FOR CALCULATING CURRENT RATING(DIRECT IN GROUND OR AIR) OF ARMOURED(XLPE) CABLE OF 4C,16Sqmm?
how i calculate the syncrones generator NGR resistance .if we have a 6mw generator line voltage of generator 11kv also line current 393.3 ampere.
Help need in transformer !? Hello Friends The parameters of 2300/230 v 50hz t/f is R1=0.286 ohm R`2=0.319 ohm Rc=240 ohm X1=0.73 ohm X`2=0.73 ohm Xm=49.2 ohm Secondary Load impedance ZL=0.387+J0.29 solve the exact equivalent circuit with normal voltage across primery.. I know every thing but i cant find CURRENT I1=? and I`2=? Please help me give solution or only Formula please please...
WHaT IS THE CONCEPT OF INDUCTION LAMPS IN MODERN LIGHTINGS, and HOW IT WORKS TO EMIT LIGHT ( AS NO ELECTRODES ARE PRESENT ) ?" COULD INDUCTION LAMPS CAUSE INTERFERENCE WITH COMUNICATIONS INTO A STORE USING INDUCTION LIGHTING ? WHAT IS THE BENEFIT OF USING THE LOW FREQENCY INDUCTION LAMP , VERSUS LED , AND VERSUS FLUORESCENT, AND VERSUS ANOTHER KIND OF LIGHTING . THANK yOU MOISES GUINDI
what is mean by dry frequency
full form of flry b
how we sesign the transformer give some specifion regarding design of transformers
What are books to be referred for KPTCL exam?
hi frenz,its aswathy.i hve aplied for the hpcl test on feb,pls send the test patern & the placement papers as soon as possible. mail-id :kjaswathy@gmail.com
why single phase to grd test in HV cable?why not 2 phase at a time?
please send 5yearje solved papers on my email himmatsinghnathawat@gmail.com
what are pilot cells
is it necessary to earth the rmu before cutting off the transformer winding?if yes why?
