Electrical Symbols

[johnrumsey]

I am building control panels for the HVAC/R industry and would like to be consistent within my drawings. These panels commonly have 120VAC, 24VDC, and 24VAC. I am currently using (L/N) for my 120VAC circuits and (+/-) for my 24DC circuits. For my 24VAC circuits I am using (~) to denote line voltage. My question is what symbol should be used for the neutral side of a 24VAC circuit? I would like to make is different from the 120VAC.

 

[cadpoint]

My question is what symbol should be used for the neutral side of a 24VAC circuit?

I'd use a long dash if it'll be a black and white print.
Due to the way long dashed present on a printer or plot
I'd be sure to start a solid line off each object and then start your long dash line.

If Color is your final output try "BLUE" like it's used in Europe

Function	label	Color, IEC
Protective earth	PE	green-yellow
Neutral	N	blue
Line, single phase	L	brown

what color is neutral in europe

 

[goldstar]

I don't think there is (specifically) a neutral for 24VAC. The secondary voltage is coming out of a transformer so each side has equal potential.

 

[petersonra]

I don't think there is (specifically) a neutral for 24VAC. The secondary voltage is coming out of a transformer so each side has equal potential.

Maybe not a neutral, but sometimes one side is grounded.

I would be inclined to just call it 24VAC.

 

[Frank DuVal]

Each side has equal but opposite potential? Other wise how could current flow? Still not right.

The two terminals of the transformer have potential BETWEEN them.

24 VAC and 24 VAC Return are good.

The HVAC diagram I am looking at right now uses

24 H
24 C

for 24 VAC hot and 24 VAC Common. And the common is not grounded. There is a note that the 24 volts can be AC or DC, however the circuit is fed from a transformer without rectifiers, so obviously AC.