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Identify one item that needs to be disconnected prior to carrying out insulation resistance tests?

The voltage source needs to be disconnected prior to carrying out insulation resistance tests. Disconnect any electronic devices like Variable Frequency Drives, Soft Starters etc. These devices are likely to get damaged if meggar test is done keeping them in circuit.


Is 200Mohms an acceptable result when carrying out an insulation resistance live-live test on a shower block?

If you have 200 megohms on an insulation test of a conductor it is more than enough to feel safe about applying a voltage to the conductor with out it shorting to ground.


Does the insulation of wires affect its quality?

yes and no The problem is that the Word "Wire" refers to the both the metal core and the Wire as a conductor and insulation package. Another problem is what you mean by "quality". What definition are you using? The insulation is critical to determining the use and safety of a wire. The resistance of the metal wire is not affected by the insulation, but its ability to dissipate heat while carrying high current is.


What is effect of resistance in heat production in a current carrying conductor?

resistance will be high


Why do pipes carrying the steam to the radiator need to be insulated?

Other wise heat loss will occur and the radiators wont be as hot.


Why do the pipes carrying the steam to the radiator need to be insulated?

Other wise heat loss will occur and the radiators wont be as hot.


Why Vehicles carrying inflammable material like petrol are covered with bad conductors of heat?

Usually, a petrol tanker would not need to be insulated from the ambient temperature.But there are substances such as LPG that have a quite low boiling point, and these could be insulated.And again, tankers carrying liquids with a very low boiling point, such as liquid oxygen or liquid nitrogen will almost always be well insulated.


Where could one find an insulated mug?

An insulated mug, useful for carrying hot or cold beverages, can be purchased at most department stores and home goods stores. Examples of such stores include Walmart, Target, and Bed, Bath and Beyond. Promotional insulated mugs with logos can be purchased online at Branders.


Why would never measure resistance in a circuit carrying a current?

If the circuit is carrying current then that means that the load (resistance) is in the circuit. if an ohm meter is connected in the live circuit then there would be some voltage drop at the ohm meter but as the meter has very less resistance, this would damage the instrument.


Why insulation is needed on current carrying conductors?

To prevent the wire from getting short circuited to ground or even to other wires.


Why you Removal of lamps from lighting outlet points When carrying out an insulation resistance test on this installation?

I'm not sure exactly what you're asking, but it sounds like you are wanting to test for any potential weak spots in insulation which would allow for stray current to pass through. You would want to set the circuit so that it would be an open circuit, so that if it was truly an open circuit, no current would be flowing through the circuit, where if some breakdown in the insulation allowed for a current flow, then you would be able to detect it.


What does 16 in column 5 means corrosive liquid n.o.s?

maximum16 litres permitted on a passenger carrying vehicle