In the hi-leg delta, the nominal voltage between the stinger/high leg to neutral is 208V, the same as between any two phases in a 120/208V 3-phase 4-wire wye system. The ratio 208/120 is the square root of 3, a number you see a lot in 3-phase theory. Also, the nominal voltage between neutral and ground is zero, but in any real system you will see a small voltage due to the voltage drop along the current-carrying neutral. Safety grounds (green or bare) *never* carry current under normal conditions, so they normally have no voltage drops. That's why neutral and ground are separate. I would have explained the different systems in terms of phasor diagrams. While it's a little more mathematical it makes the reasons for all the various voltages *much* clearer.
i have hit the jackpot with this site, i am teaching myself Elec. work, i am an NCCER Apprentice...... Thank you so much for these videos...... Great !
I understood all the way to high leg, but then the wheels fell off. In your diagram you say B to N/G is 200, but in the line below it says 120. How does high leg differ from standard three phase?
Also you Technically you need a electrical license to work on anything electrical. It doesn't matter if it's 1v or 10,000v. Technically speaking you need an electrician to install a hard wired doorbell even though it operates at 12v. Though most times it's not that big of a deal.
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In the hi-leg delta, the nominal voltage between the stinger/high leg to neutral is 208V, the same as between any two phases in a 120/208V 3-phase 4-wire wye system. The ratio 208/120 is the square root of 3, a number you see a lot in 3-phase theory.
Also, the nominal voltage between neutral and ground is zero, but in any real system you will see a small voltage due to the voltage drop along the current-carrying neutral. Safety grounds (green or bare) *never* carry current under normal conditions, so they normally have no voltage drops. That's why neutral and ground are separate.
I would have explained the different systems in terms of phasor diagrams. While it's a little more mathematical it makes the reasons for all the various voltages *much* clearer.
i have hit the jackpot with this site, i am teaching myself Elec. work, i am an NCCER Apprentice...... Thank you so much for these videos...... Great !
That is how the Canadian Electrical Code defines extra-low, low, and high voltages when working in the electrical trade.
I know its an old vid but better late than never tnx for sharing🤙
Great informative, possibly life saving info for someone....
There is an easier way to calculate the high leg voltage. Simply multiply the phase to phase voltage by the sin(60°) or 0.86623.
+Jolyon Welsh Thanks for that info,I did not know that.
Awesome video! 😎👍
I understood all the way to high leg, but then the wheels fell off. In your diagram you say B to N/G is 200, but in the line below it says 120. How does high leg differ from standard three phase?
It could start at 100kv :-) I don't know, but these are some common voltages in the construction industry-not limited to these tho
I all ways check voltage at a 3 phase panel. the very first 3 phase panel I worked on had a stinger leg.
Thanks for the vid. On 277/480: you can get 277V phase to neutral on BOTH Y and Delta configurations?
Also you Technically you need a electrical license to work on anything electrical. It doesn't matter if it's 1v or 10,000v. Technically speaking you need an electrician to install a hard wired doorbell even though it operates at 12v. Though most times it's not that big of a deal.
extra-low voltage is less than 30v
Low voltage is greater than 30v but less than 750v
High voltage is anything greater than 750v
this is Canada
Prefer to watch Mike Holt...