Excellent instruction but I have one question: The star side of a delta/star supply transformer has the neutral connected to the central point of the star which is earthed so why would you not show zero ohms from neutral to earth, or am I missing something? Thanks
Could you please answer my question below to clear up the confusion for me which is why do you not get zero ohms between neutral and earth in the consumer unit if the neutral is ultimately connected to earth back at the supply transformer?
Hi Bernard, The neutral is isolated on the single-phase, so there is no connection between N-E when the isolator is switched off. You will get a short on insulation resistance in the 3-phase board on a TN system as the neutral is bolted direct to the neutral bar and so you have to then remove it to complete the test. Let me know if you need further?
Dont use 500v in real life, it will fry up electrical equipment in a domestic home including loads and stuff, use 250v then do calculation as if it was a 500v test. This way you dont need to remove light bulbs and stuff
I couldn't see what you were probing on to, in order to conduct the test and you didn't tell the viewer... ! Terrible video and a poor choice of cameraman.
Do some more videos I watch alot of videos and your presentation is very good
Its so much helpful for students keep it up.
Excellent instruction but I have one question: The star side of a delta/star supply transformer has the neutral connected to the central point of the star which is earthed so why would you not show zero ohms from neutral to earth, or am I missing something? Thanks
Great video
Could you please answer my question below to clear up the confusion for me which is why do you not get zero ohms between neutral and earth in the consumer unit if the neutral is ultimately connected to earth back at the supply transformer?
Hi Bernard, The neutral is isolated on the single-phase, so there is no connection between N-E when the isolator is switched off. You will get a short on insulation resistance in the 3-phase board on a TN system as the neutral is bolted direct to the neutral bar and so you have to then remove it to complete the test. Let me know if you need further?
@@daytonamann5618 cleared up my confusion, thanks.
Thank you
Dont use 500v in real life, it will fry up electrical equipment in a domestic home including loads and stuff, use 250v then do calculation as if it was a 500v test. This way you dont need to remove light bulbs and stuff
I couldn't see what you were probing on to, in order to conduct the test and you didn't tell the viewer... ! Terrible video and a poor choice of cameraman.