Answer / shalini.b

NO means normally open - during off condition or any other
abnormal fault condition the contact will open therby
forming a open circuit providing no path for the flow of
current.
NC means Normally close- during normal operations the
contact will be closed forming the closed circuit

Answer / karthik.$

"NO" means normally open that means, the corresponding coil
is not energized it will be in the open condition. it will
closed only the condition satisfied."NC" means normally
closed condition if the corresponding coil is energized it
will open ... The NO & NC element and contact are normally
used in control circuit and the PLC LADDER LOGIC....

Answer / mahder

No is normally open contact, that means at normal condition
it's open and the after getting energy or after being
energized it will change to closed or it will close it's
normally open contacts.
Nc is normally close contact, Nc have the reverse function
of No, at normal condition it contacts are closed and when
it gets energy(power) it will open it's contacts.

Answer / vinod

relays/ pressure switch/temprature swicth etc. have NO & NC
contacts
NO (Normally Open) means the contact of the relay will be
open during the relay coil de energised condition and
contact close when relay coil energised condtion.But in
thermal switch NO means swich conacts open during the set
temprature and close when the temprature exced the set
value.
NC (Normally Close)means the contact of the relay will be
close during the relay coil de energised condition and
contact open when relay coil energised condtion.But in
thermal switch NC means swich conacts close during the set
temprature and open when the temprature exced the set value.
NO & NC can be used in control/power circuit depends on
requirement.

Answer / md. zakir hosen

In the case of Relay:
NO means Normally Open.
NC means Normally Closed.

also In the case of IC (Integrated Circuit ):
NC means No Connection

thanking u
z_hosen@yahoo.com

Answer / sunil kanusu

no means normal open i.e initially its contacts were
open.And nc means normal close i.e initially its contacts
were closed.In control applications these very useful.if we
press 'no' its contacts closed otherwise contacts were
open.similarly if we press 'nc' its contacts open otherwise
contacts were closed.

Answer / p.satheesh

No means No
Nc Means NC

Answer / venkatesh sk

no means nomal open function nc meanis normal open it is
used in control cricut

what are the applications of transistors with low dc gain, high dc gain and medium dc gain( beta)?

0 Answers  

what is meant by loss of field in a DC motor? how a universal motor works?

0 Answers  

In track electrification Either we use single conductor or double conductor? why?

2 Answers  

what is meant by armature reaction?

13 Answers  

How to Design green buildings services? What is the advantage to design green building?

0 Answers  

what is the impedance voltage of transformer?

1 Answers   AVI Enterprises, MacLellan,

what are the safety of chiller.

7 Answers  

What is the function of a neutral reactor.

0 Answers  

why in scott connection of transformers, main transformer is tapped at 50% and teaser transformer at 86.6%?

5 Answers   Bhel, Bosch, College School Exams Tests, Wipro,

what is a speed of rotor when we give supply to stator of 50hz and as well as rotor of 60hz of an induction motor?????

0 Answers  

what's the different between ELCB, ELR and ELS?

1 Answers   CP,

Energy metering: On the property I am renting, the supply voltage is 2 x 110 volts. These 2 x phases enter a energy meter which then exit the meter to over head lines to my house. Question 1. The meter is single phase 240 volts but is being used as 2 x phase(2 x 110volt), is this acceptable? if not, please give me the reasons. The meter details are as follows: 60Hz 15amp Imax 100 amp Kd 3,6 Wh/R 1 fase 3 hilos Model FX 231. I think it was manufactured in Brasil From this meter, the cables run along over head aluminum conductors,I estimate the cross sectional area to be 25mm diameter, but the neutral is only about 10mm square diameter, which cover a distance of 170 meters and then terminate with an underground cable of 65 meter length, total length = 235 meters. There must be a huge voltage drop over this length. This line is protected with 2 x 200 amp aluminum fuses after the meter, there is no main switch in the distribution board. These 2 phases connect directly onto 2 busbars. Surely the neutral should be the same size as the conductors if not more? Question2. What are your thoughts about this installation, should there be better protection, is the neutral too small? During the night, the lights dim then brighten all the time, this cannot be good for my electrical appliances. In my home, I only have a small electric geyser and fridge, my stove works off gas. But when i use other appliances like the washing machine or microwave oven, the light dim. The internal wiring of this house is done with solid hard drawn copper wires and of course, they have to be under rated. I am a retired electrician by trade, but not on the metering and over head mains side, my experience is on the factory maintenance side of things. Your expertise on these matters will be greatly appreciated. Please inform me how to rectify or make any improvements Kind regards, my power bill is very expensive, so I need to know how to bring it lower. Kind regards, Brian

1 Answers