[SML] L21-30 power supply

Patrick McCreary vze2gmht at verizon.net
Sat Feb 28 22:32:28 UTC 2015


Thanks, Dan. Got my rows and columns mixed up in my memory. Even better 
for Tim - more wattage to distribute, easier to balance loads.

Patrick


On 2/28/2015 2:14 PM, Dan Sheehan via Stagecraft wrote:
> L21-30 is designated for 3-phase 5-wire   ( 3 hots, neutral, ground )
>
> ( see
>   http://www.stayonline.com/detail.aspx?id=6767
> for details)
>
> Rated for 120/208 V    ( 120 each hot to neutral, 208 each hot-to-hot pair )
>
> Should be fed from a 3-pole ganged 30A breaker,
> which means that "Bento box" or similar can have
> up to 30A for each *pair* of outlets.
>
> *IF* your existing installation has the triple-30 breaker for this
> L21-30 outlet,
> AND is feeding other 120V loads from this panel (or you otherwise
> verify 120V each hot to neutral),
> looks to me(*) like you're good to go,
> subject to the total current available to, and otherwise used by, this panel.
>
> (*) = I am not a "qualified" electrician
>
>
> On Sat, Feb 28, 2015 at 12:06 PM, Patrick McCreary via Stagecraft
> <stagecraft at theatrical.net> wrote:
>> Tim -
>> It seems to me it will work just fine for you. Assuming the breakers that
>> feed it in the panel are ganged, there should be no problem. Since it's
>> being fed with 2-phase power, you'll get somewhere near 60 Amps out of it
>> for use on stage (30 Amps per leg.) If you decide to extend it further away
>> from the breaker panel, (and I wouldn't go more than 25 - 30 feet,) make
>> sure you use the right gauge of Type SO (NOT SJ) cable and good (Hubbell)
>> connectors, properly installed. Off the top of my head, 10/4 SO or SOW.
>>
>> Patrick





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