Any Electricians?? How to build a 220V distro for a Rock PA system??

Discussion in 'Archived Threads 2001-2004' started by Keith Paynter, Oct 4, 2002.

  1. Keith Paynter

    Keith Paynter Screenwriter

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    A little help?

    Any suggestions, sites etc, on how to build a step down distro - 50amp 220v to 6x15amp 120V plus 1-30amp 120v?
     
  2. Greg_R

    Greg_R Screenwriter

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    Is the 220 single phase? If so, you've got 110V on each leg. You could run it into a circuit breaker junction box and install the appropriate breakers (6 15amp + 1 30amp). Black and Decker's book Advanced Home Wiring is a helpful resource. Be sure the box is grounded correctly. You will need a fuse or breaker on each line (circuit breaker is the easy way to do this).
    If the line is 3-phase then you'll need a phase converter. If it's 3-phase you should get professional help (electrical kind).
     
  3. Eric Kahn

    Eric Kahn Guest

    110 is just one side of 220 with the neutral wire
    to build the PA distro bos, you will need a standard breaker box with a 50 amp main breaker
    the 6 15 amp breakers
    a section of 6/4 SO type cable to hook to your power source
    a bigger box to mount all this stuff in and to put outlets on
    the 6/4 SO cable will have 4 6 gauge wires in it
    a black one
    a red or blue one
    a white one
    a green one

    the black and red or blue one are your power lines
    L1 and L2
    the white one is neutral and how you get 110
    the green is ground
    neutral and ground are also hooked together most places
    the breaker box will have busses for all these wires
    when you look inside the breaker box, you will see that there are 2 busses for the breakers to hook onto, one for each of the 220 power lines
    when you wire a 110 circuit, you take a wire, the black hot one, and hook it to the breaker for that circuit and you hook the white wire and the ground to the neutral and ground buss (which are the same buss where I live) but you should keep them on seperate busses un till you find out how the 220 power hookup you will be using is set up
    to run the wire from the breaker in the box to the outlet for each circuit, you should use 12/2 roamex type wire which will have a black wire, a white wire and a bare copper ground wire
    black wire goes to the circuit breaker in the box, white wire to the neutral buss and the ground to the ground buss
    I have done a little concert work and every time we had to hook the wires of the distro box right into the power panel
    using the screw terminals in the power panel since there are no "standard" 220 plugs, there are about 8 different types that tell you the amps of the circuit and wheather it is grounded or not, just remeber the old dryer plug game, so it is usually easier just to hook the wires into the power box than to carry around a bunch of plugs to get the right one
     
  4. Eric Kahn

    Eric Kahn Guest

    if you run into a 3 phase setup, you just need to find out wheather it is Delta or Wye wired, if it is Wye wired, you can use any 2 of the 3 phases to neutral to get 110
    if it is Delta, you have to use the 2 low legs to get 110 to neutral, the 3rd leg is known as the high or "wild" leg and will give you 220 to neutral, a good way to fry your equipment, carry a multi meter with you to check the voltage's of the outlets after you hook it all up

    A 3 phase converter is used to convert single phase to 3 phase, not the other way around since you already have single phase present in 3 phase

    you should not run into 3 phase power unless you play in a BIG venue, like a large ware house or arena, bars and clubs usually do not have 3 phase.

    another clue to 3 phase is that when you open the eletrical box there will be 3 power wires, a black, a blue and a red or 3 blacks somtimes
    if it is black, blue, red, it will be Wye wired and you can use any 2 of the 3 with the nuetral
    if you see black, blue, orange or red blue orange, it is Delta wired and the orange is the High leg you want to avoid
     
  5. Chris Lanni

    Chris Lanni Stunt Coordinator

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    Keith,

    Are you talking about something you will have in your house? Like a sub-panel? If you're talking about taking a feed from your main panel box in your basement and wiring a sub from it then it's not to difficult. A little more info would be appreciated.

    Chris
     
  6. Keith Paynter

    Keith Paynter Screenwriter

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    The end result is to build a distro that is adaptable to most nightclub stages, etc. (2x110 as Eric mentioned). This way, we can run enough 110 circuits to safely operate 2 sets of lights (15 amp capacity each), power amps/powered mixer (2 more 15 amp), 2 miscellaneous (guitar/bass amps), and one 110v 30 amp power amplifier (2000 watts per side at 4 or 2 ohms).

    Typically, it is the dryer plug style as Eric pointed out, but places like Home Depot sell short 40 amp capacity dryer plug replacement cables, but we want the headroom of a 50 amp 220v plug and line. The configuration that I want should safely run 8x15 amp and 1-30 amp all at 110V.

    This would be built to suit one club that we locally play fairly regularly (they love it loud). There we typically run a rig that pushes (in stereo) 2x2000watts per side for subs (single 110v 30 amp, twist-lock 3-pin power amp), and 2x1200 watts per side with tops (single 110v 15amp). We use self contained lighting, 2 bars with 4 Par56 300w bulbs. (2x15 amp 110v). Monitors are powered from console (110v 15 amp).

    Their 220v is directly fed (1 foot) to a 50 amp breaker on a panel box already - all we have to do is plug right into it.
     

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