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Author Topic: Distro Frustration  (Read 1440 times)

Paul Miller

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Distro Frustration
« on: April 30, 2024, 07:01:28 AM »

Distro shopping. My main venues all supply CA style 50A feeds and assorted distros which range in condition from decently functional to beyond sketchy. Currently there are three Danley DNA 20K4Pro amps in my rack, with a fourth pending, probably next season. I've been running the amps on 120V 20A circuits and I'd like to run them on 240V 20A circuits.

Ideally I'd like a 3 space rack mount unit with 2 L6-20 receptacles and one 5-20 receptacle per leg, so 4 total L6-20 for the amps and 2 5-20 for everything else. So far the only distros with CA style mains I can seem to find (Lex PRM3KN-9CC, Motion Labs 1105-3-ZZ-151-0001, PDLink RL 2U6E 8EE) are limited to 6 120V 20A circuits (3 per leg) with 5-20 duplex receptacles, and no 240V options.

Does anyone know why this is, am I missing something here? Seems like max current draw per leg would come out the same, 20A x 3 = 60A, so that shouldn't be a problem right? Is this such an uncommon configuration that it doesn't even come as an option? Any other reputable distro manufacturers I should be looking at?
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Rob Timmerman

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Re: Distro Frustration
« Reply #1 on: April 30, 2024, 07:13:55 AM »

An L6-20 draws 20A from each leg, so you're not going to get 4 of them and 2x 5-20 on a 50A 240V circuit without doubling things up on breakers.
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Matthew Knischewsky

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Re: Distro Frustration
« Reply #2 on: April 30, 2024, 12:07:06 PM »

Distro shopping. My main venues all supply CA style 50A feeds and assorted distros which range in condition from decently functional to beyond sketchy. Currently there are three Danley DNA 20K4Pro amps in my rack, with a fourth pending, probably next season. I've been running the amps on 120V 20A circuits and I'd like to run them on 240V 20A circuits.

Ideally I'd like a 3 space rack mount unit with 2 L6-20 receptacles and one 5-20 receptacle per leg, so 4 total L6-20 for the amps and 2 5-20 for everything else. So far the only distros with CA style mains I can seem to find (Lex PRM3KN-9CC, Motion Labs 1105-3-ZZ-151-0001, PDLink RL 2U6E 8EE) are limited to 6 120V 20A circuits (3 per leg) with 5-20 duplex receptacles, and no 240V options.

Does anyone know why this is, am I missing something here? Seems like max current draw per leg would come out the same, 20A x 3 = 60A, so that shouldn't be a problem right? Is this such an uncommon configuration that it doesn't even come as an option? Any other reputable distro manufacturers I should be looking at?

Motion Labs likely would be able to build something suitable though it might not fit into a 3 space rack. 240V circuits need twice as many circuit breakers as 120V so there may not be enough real estate on the panel or inside a 3U box. It's been a few years since I have looked at Motion Labs but they used to build what you want as a custom project as long as it meets code.
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Nathan Riddle

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Re: Distro Frustration
« Reply #3 on: April 30, 2024, 12:58:29 PM »

An L6-20 draws 20A from each leg, so you're not going to get 4 of them and 2x 5-20 on a 50A 240V circuit without doubling things up on breakers.

This assumes 100% duty cycle.

I'd bet you can get 10x DNA20Ks on a 50A 240v circuit as evident from a recent DSLUG post.
« Last Edit: April 30, 2024, 04:06:09 PM by Nathan Riddle »
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Brian Jojade

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Re: Distro Frustration
« Reply #4 on: April 30, 2024, 02:22:01 PM »

Having more branch circuits than the total mains rating isn't uncommon.  That's why there's a main breaker there.

Getting a custom built distro is what you'll probably need to do, since every potential configuration out there isn't possible for manufacturers to have in stock. Custom built vs stock isn't that much different in price.
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Brian Jojade

Kevin Graf

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Re: Distro Frustration
« Reply #5 on: April 30, 2024, 03:33:08 PM »

An L6-20 draws 20A from each leg, so you're not going to get 4 of them and 2x 5-20 on a 50A 240V circuit without doubling things up on breakers.
A receptacle doesn't draw current, it's the load that draws the current. You can put several 20 Amp receptacles on a 50 Amp circuit. It's the 50 Amp breaker that limits the total circuit current.
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Bob Faulkner

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Re: Distro Frustration
« Reply #6 on: May 01, 2024, 08:45:41 AM »

Distro shopping. My main venues all supply CA style 50A feeds and assorted distros which range in condition from decently functional to beyond sketchy. Currently there are three Danley DNA 20K4Pro amps in my rack, with a fourth pending, probably next season. I've been running the amps on 120V 20A circuits and I'd like to run them on 240V 20A circuits.

Ideally I'd like a 3 space rack mount unit with 2 L6-20 receptacles and one 5-20 receptacle per leg, so 4 total L6-20 for the amps and 2 5-20 for everything else. So far the only distros with CA style mains I can seem to find (Lex PRM3KN-9CC, Motion Labs 1105-3-ZZ-151-0001, PDLink RL 2U6E 8EE) are limited to 6 120V 20A circuits (3 per leg) with 5-20 duplex receptacles, and no 240V options.

Does anyone know why this is, am I missing something here? Seems like max current draw per leg would come out the same, 20A x 3 = 60A, so that shouldn't be a problem right? Is this such an uncommon configuration that it doesn't even come as an option? Any other reputable distro manufacturers I should be looking at?

As Matthew Knischewsky mentioned, contact MotionLabs; in addition to their regular inventory, they custom build solutions.
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Steve Eudaly

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Re: Distro Frustration
« Reply #7 on: May 01, 2024, 12:19:20 PM »

Applied Electronics and Entertainment Manufacturing Group will also do custom distro builds.

Peter Kowalczyk

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Re: Distro Frustration
« Reply #8 on: May 23, 2024, 03:29:22 PM »

Applied Electronics and Entertainment Manufacturing Group will also do custom distro builds.

I've been happy with the custom 50A breakout 'sleds' that I purchased from Applied.  In my case, they're wired with a set of 4x PowerCON outputs at 240V, and Edisons at 120V.  I'm sure they can build whatever config you need.
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Tim Padrick

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Re: Distro Frustration
« Reply #9 on: May 25, 2024, 08:48:12 PM »

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ProSoundWeb Community

Re: Distro Frustration
« Reply #9 on: May 25, 2024, 08:48:12 PM »


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