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Sound Reinforcement - Forums for Live Sound Professionals - Your Displayed Name Must Be Your Real Full Name To Post In The Live Sound Forums => AC Power and Grounding => Topic started by: JR Mulloy on September 12, 2019, 06:11:24 am

Title: Power distro for powered subs/arrays
Post by: JR Mulloy on September 12, 2019, 06:11:24 am
I am thinking about making or buying if itís out there a power distro for my powered subs/arrays instead of having to run multiple 10ga 120v I could run a single 240v with twist lock L21-30 from my main (motion labs distro) out to each cluster of speakers to this other distro does anyone else run something similar have any pics?
Title: Re: Power distro for powered subs/arrays
Post by: Brian Bolly on September 12, 2019, 09:43:59 am
We use exactly what you describe.

Either these (https://www.motionlabs.com/wp-content/uploads/1150-02-106-400-0701.pdf) for L21-30 to L6-30x3 (they'll build them without the half cheese), or something like this (https://www.motionlabs.com/wp-content/uploads/1175-01-003-208-0001.pdf) for 20A outs.  They'd probably build the latter one with a pair of 2-pole breakers if you want 208V, but we've never asked.
Title: Re: Power distro for powered subs/arrays
Post by: JR Mulloy on September 12, 2019, 10:20:11 am
I was further looking into this it appears L21-30 would be 3 phase I would need to use L14-30 plugs for 240v from what Iím understanding
Title: Re: Power distro for powered subs/arrays
Post by: Mark Cadwallader on September 13, 2019, 01:09:34 pm
JR, what connector do you have as the "out" from your distro that you will be using?  What connector do your powered subs and arrays use?
Title: Re: Power distro for powered subs/arrays
Post by: Tim McCulloch on September 13, 2019, 02:17:53 pm
I was further looking into this it appears L21-30 would be 3 phase I would need to use L14-30 plugs for 240v from what Iím understanding

JR-

L21-30 configuration is for 120/208V 3 phase service and L14-30 is for 125/250V (don't worry about the extra volts) split phase service.

Are your powered subs "universal" with respect to service voltage?  If so you'll find a smaller difference in current demand between 208 and 240V, compared to the difference between 120 and 208.  If you subs MUST have either 120V or 240V but nothing in between, you potentially have another issue to deal with.

So what are you using?
Title: Re: Power distro for powered subs/arrays
Post by: JR Mulloy on September 16, 2019, 08:44:53 am
they are just 120v want to do this so Iím not running so many power feeds 2-10/4 vs.4-10/3 runs would be less mess easier cable management is all im looking for
Title: Re: Power distro for powered subs/arrays
Post by: Mark Cadwallader on September 16, 2019, 12:18:51 pm
JR, I'm still trying to figure out what you need.

1. Do the powered speakers use a NEMA 5-15 plug?  If so, how many amperes of 120 volt power do you need at each location?  What (and how many) powered speakers do you have at each location?

2. What is the NEMA designation of the receptical you are using on the distro to feed the drops identified above in 1?

3. How far (in feet or meters) is your distro to the furthest drop?
Title: Re: Power distro for powered subs/arrays
Post by: JR Mulloy on September 17, 2019, 05:53:04 pm
They are jbl srx828sp usually 3 per side and rcf hdl20a 4 boxes flying per side
Title: Re: Power distro for powered subs/arrays
Post by: Mark Cadwallader on September 17, 2019, 06:22:15 pm
Motion Labs and Lex (and others) offer rack mount distros for L21-30, L14-30, and CS-50 inputs.  There are also industrial/construction "spider boxes" for L14-30 and CS-50 inputs, and various "lunch box" styles to chose from.

All of those would arguably give you a one cable run from your main distro to each side's smaller distro, depending on the expected real world amerage needs for your rig.

Look for UL or ETL certification on whatever you select; it will make the AHJ happier (and also your insurance company).  Buy once, cry once.
Title: Re: Power distro for powered subs/arrays
Post by: JR Mulloy on September 19, 2019, 08:02:22 am
I found this https://www.amazon.com/CEP-Construction-Electrical-Products-6503GU/dp/B000KL4I2K/ref=pd_lpo_sbs_60_t_1/136-9378441-9942211?_encoding=UTF8&psc=1&refRID=Z3GKAT9FSSE2J88EX7JV
Title: Re: Power distro for powered subs/arrays
Post by: Mark Cadwallader on September 19, 2019, 09:33:14 am
CEP generally makes quality, UL listed products. If your main distro has L14-30 outs, that item "should" work for you.  The outlet should say right on it the NEMA configuration. (I always look to make sure; I can't tell at a glance the difference between an L5 and an L6 plug.)