---------- Forwarded message ----------
Date: Sat, 08 Mar 2008 23:27:00 -0000
From: tony giovannetti <Tglights@...>
To: EntertainmentElectricity@yahoogroups.com
Subject: [EntertainmentElectricity] Re: 120VAC over microphone cable?!?


This is an easy one.... The XLR connector isnt listed for that
voltage, so you can't use it..and the cable isn't rated for it
either....so DONT DO IT...

also..
it's extremely bad practice to mix voltages on connectors in a venue,
especially one so ubiquitous as a 3-pin XLR, leads to nasty
surprises....

I'd be interested to hear just what they were going to run with
this? a motor? an effects machine?
In my experience with NY rental shops I've not heard of this
practice... the shop would be SO liable...

thanks

tony






--- In EntertainmentElectricity@yahoogroups.com, cpz@... wrote:




>
> In a flurry of recycled electrons, Steve Terry wrote:
> [Charset ISO-8859-1 unsupported, filtering to ASCII...]
>> --- In EntertainmentElectricity@yahoogroups.com, "Ken Porter"
>
>>> Apparently the tech who came with the show wants to run 120VAC
power,
>>> at 1.1 amps over microphone cable (i.e. 3-pin XLR, typically
about 20-
>>> gauge wire) to run a small motor.
>
>> If it's line voltage, and it's in a theatre,covered by NEC article
>> 520, it needs to be run on an extra-hard-usage cable (see NEC
table
>> 400-5 for allowable Extra Hard usage types).
>
> A few thoughts, as the coffee works it's magic:
>
> There are some varieties of mic cable that would be fine with 1a,
IIRC
> Belden makes some 18g stuff with a rather heavy (read- almost
forklift
> proof) jacket. You probably don't have that. Past that, most
flexible
> mic cable is probably "unrated", anyway.
>
> Art. 520 and it's friends in the 520's do cover theaters and
temporary power.
> There is a way to read individual pages on the NFPA web site for
free.
> You'll have to look there for further info.
>
> -IF- the motor in question is part of a "power-limited" circuit
using a
> listed supply, and is part of a manufactured system (that's
listed), it
> might be OK. Plugging into the wall doesn't count :-).
>
> It might fit in the catagory of a Class-1 remote control circuit,
but
> you still need at least 18g. Class-1 circuits can mix power and
control
> conductors in the same assembly.
>
> I suppose that's a long winded way of saying "not in -my- house."
>
> (FWIW, I might tolerate zip cord run out to something like this, but
> I'd want to see everything first. Given the price of cheap-a$$ 16g
> extensions, I'd rather they used some of those.)
>
> z!
>




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