# Wiring a traffic light

So I have aquired 1 light of a traffic light that I salvaged from a local dump. I want to try and connect the light to use it like a lamp, however I am a little worried by it as the connector only has live and netural wires.

Basically I want to know if it is possible to earth the system or is it safe without earthing? I read into double insolation but cannot tell exactly how it works.

Sorry if this is very basic or been answered somewhere else, I wasn't exactly sure of how to find an answer.

• Before you invest money into that project, check that the lamp still has a chance of working, by measuring the internal resistance with a multimeter. It should be somewhere between 10–200Ω, depending on wattage ($R=\frac{U}{I}$, $P=UI$ ⇒ $I=\frac{P}{U}$ ⇒ $R=\frac{U^2}{P}$, so for e.g. $U=110\textrm{V}$ and $P=1\textrm{kW}$, you get $R=\frac{110^2}{1000}=\frac{12100}{1000}=12.1$) – Simon Richter Feb 23 '19 at 12:11