[SML] Safety tip.

[Derek Leffew]

On 4/24/15, 7:10 AM, "stagecraft-request at theatrical.net"
<stagecraft-request at theatrical.net> wrote:

> Hypothetically speaking, if you have an electrically powered device
> rigged over your stage from an outside artsy builder.  Make sure that
> the safety ground in the plug is actually connected to the metallic
> frame of the device, and the current carrying conductors are protected
> from damage.   Because, well, when the current shorts out to the
> structure, and the only path back to ground is via the wire rope holding
> it up.  The wire rope acts as a fusible link, and it's WLL goes to zero
> with a pop, followed moments later by a crash.
> 
> Just sayin.
> 
>    --Dale

Funny,  in the late seventies, that's exactly the reason stated (wire rope
acts a a path to ground connected to building steel) by the college lighting
professor for why we DIDN'T need grounding stage pin connectors in our 1968
building.  Late eighties I believe, when the original dimming system went to
DPC, 2P AND G s were finally installed.