I have these 2 lights came out of my Princess stove that is on the boat.
I replaced all 4 on the stove with new lights.
I want to use these 2 for reverse polarity hookup, they would light up if hot and neutral wire reversed
MDUSTRIAL DEVICE
2170A23 SR is printed on them

.
I recall a resistor was in series with the neon light.

I do have a working one, but I need to measure the resistor.
Does any one know what the value would be so I can test these here at the house?

 

Depends on the neon, but 100K to 220K is likely ok.

 

less for 110v

 

110V=100K, 230V= 220K


http://www.bristolwatch.com/ele/neon.htm

 

yes but its not neccessarily a NE-2

Some lamps are designed for higher currents or just will be very dim behind the plastic.
Low currents prolong the lifetime however.

 

55K ohms seems to work well.
These only light if you plug in backwards the polarity, so 99.99% they will never be on.
Not dim, not too bright, just looking right.

 

55K ohms seems to work well.
These only light if you plug in backwards the polarity, so 99.99% they will never be on.

good one. but true, no need to worry about wearing out.

I'm now importing blue one's from China already have green ones, with phosphor coating.

 

This stove is a 1970 model, so they are 45 years old.

The 55K resistors are about 1/4 inch wide and inch long so I think big enough to work. They came out of an 3000 watt inverter.

 

110V=100K, 230V= 220K


http://www.bristolwatch.com/ele/neon.htm

It really depends on the neon design current - you probably won't see many higher than 10mA, 4mA is more like it although I've seen neons rated as low as 0.4mA.

Haven't tried lately, but the resistors in those live test neon screwdrivers were higher than the meter I had at the time could measure.

AFAICR: the highest colour coded resistor I've seen in a neon lamp assembly was 470k.