In the United States, the NEC requires that runs of conduit be continuous and connections be made wrench tight. If done properly this provides added grounding protection to your circuits. If a connection is left loose, that added grounding protection does not exist.
There are times when threaded connections simply won't thread completely. This may require that the conduit threads be "run" with a threader to remove whatever is preventing this from happening. With experience you learn what is acceptable or not acceptable. Generally, if the connection is "wrench tight" and is otherwise secure, that is sufficient.
When threading rigid conduit to a coupling you will seldom get full thread coverage Three to four thread penetration will suffice to keep the conduits together and maintain the metallic system intact.
With explosion proof systems code requires full five thread coverage. With explosion proof fittings, this can be accomplished because of the finer machining of the threads in the fittings that the conduit screws into.
You would not have a full metallic conduit system. A complete system is needed to make an electrical bond for the whole electrical system. In older conduit systems before a code change the metallic system was used to carry any fault currents back to the distribution to trip the breaker.
Any break in the conduit system would prevent this from happening and hence the electrical code change.
The cable inside the conduit will be exposed.
And you will loose the integrity of your ground if you are using the conduit as your equipment grounding conductor.
In the United States, the NEC requires that runs of conduit be continuous and connections be made wrench tight. If done properly this provides added grounding protection to your circuits. If a connection is left loose, that added grounding protection does not exist. There are times when threaded connections simply won't thread completely. This may require that the conduit threads be "run" with a threader to remove whatever is preventing this from happening. With experience you learn what is acceptable or not acceptable. Generally, if the connection is "wrench tight" and is otherwise secure, that is sufficient.
In the United States, the NEC requires that runs of conduit be continuous and connections be made wrench tight. If done properly this provides added grounding protection to your circuits. If a connection is left loose, that added grounding protection does not exist. There are times when threaded connections simply won't thread completely. This may require that the conduit threads be "run" with a threader to remove whatever is preventing this from happening. With experience you learn what is acceptable or not acceptable. Generally, if the connection is "wrench tight" and is otherwise secure, that is sufficient.
what is meant by pull back effect when pulling in electric cables in conduit
You can have only one current carrying conductor in a conduit, but that conduit must have a slot to relieve the eddy currents that will be created by the transformer effect created by the conductor. It is better to run the neutral or opposite conductor along with the hot conductor together in the same conduit, or through the same penetration, so as to minimize this effect.
because i dont know
There are several projects that can be done to find out the effect of coupling on rust. One example would be to experiment on several different types of alloys to see which rusts least.
Using the cosine law of illumination, if two cables are laid at right angles, since cos 90 = 0, the coupling will be the lowest possible. If the two cables are laid parallel, the coupling will be maximum. Be aware that shielding or twisting of cable pairs reduces the coupling effect.
the circuit will pass waves of a lower frequency
because of S.L coupling
increase the balance of the liability account :)
couplings are used to join sections of long transmission shafts. couplings are also used to connect the shaft of a driving machine to the shaft of a separately built machine so as to give an effect of continuous shaft. the general classification of couplings is as given under: 1. rigid coupling 2. flexible coupling 3.Camlock coupling
Loading of Rc coupled amplifier occurs, if you doesnt use coupling capacitors...... If avoiding input coupling capacitor the amplifier will load the function generator.. For more details go to http://mycircuits9.blogspot.com