quick question.. reference voltage

[gaz2212]

anyone no where in the 7671 anyone can find a quote or reg regarding reference voltage...

the question is

what conductor gives a known volage or reference voltage???

 

[WayneL]

anyone no where in the 7671 anyone can find a quote or reg regarding reference voltage...

the question is

what conductor gives a known volage or reference voltage???

The answer would be the neutral conductor - 0 volts

I don't know if it's mentioned in the regs, but the reason is it's 'referenced' to earth (0v) at the star point in the transformer.

 

[gaz2212]

yeah i thought it was... tryin to find a reg or something to back it up??? if there is any??/

 

[AEC]

Is that the full question?

Only reference I would use would be Earth!

e.g. How would you prove polarity at a TN-C-S supply point. ( No volt stick )

Ans. Sink a Earth spike and bring a lead to the point of test.

 

[UNG]

I also would say it is earth

If the supply companies transformer loses it's earth on the star point the neutral will float as it has no reference point

 

[WayneL]

Is that the full question?

Only reference I would use would be Earth!

True,
I did think of this way as well.

Bit of an ambiguos question, really.

Earth is at 0v and the neutral is referenced to this so...... earth could be the answer.

 

[AEC]

No doubt about it.

Earth IS the answer.