Yes, the interlock is connected in series with one leg of the mains.
I believe brown and blue are used in the UK, the green would be ground,.
But for the modules they require DC from a power supply powered by the mains of course.
Most use RED for the (+) rail from the DC supply..(white) on the maXYZ
Black for the (-) rail... shield on the maXYZ..this is also connected to ground or the case of the module.
The green is not ground but used for modulation..
The color of the wire coming from the module is what we are stuck with
so, choose carefully..
if you dont have a multi-meter.. nows the time to invest in one.
They are easy to use..have fun.
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http://repairfaq.ece.drexel.edu/sam/laserfaq.htm
*^_^* aka PhiloUHF