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Crouse-Hinds L-150 Open
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Hey Dave,here's a couple pics of the 400W Mercury Vapour Crouse-Hinds L-150 open that you requested.I replaced the rusty mounting studs and nuts with stainless threaded rod and nuts and painted the brackets which looks much better.
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I guess that works in a small fixture like this one. xD
If I wanted to I could make my L-150 into an L-400 or OV-400 or whatever. xD But I am keeping mine a good old 175 watts.
A CWI ballast basically has a isolation transformer combined with ballast.
A grounded lamp shell prevents someone from getting shocked if they change lamps live on a phase to phase system since the shell is directly connected to one of the hots if a non isolated ballast was used. A CWI ballast prevents this problem by isolating the secondary from the primary.
And of course the glass can't shock you, just the metal lamp shell.
EDIT Vince's diagram should help clear things out.
I assume you meant to say that the socket shell needs to be grounded, which makes sense anyway.
Regulated lag ballasts offer all those advantages, plus a better lamp regulation! They do however have more losses, while CWI ballasts are somewhat between regulated lag and HX