Question about Intermatic Malibu 300W Power Pack Transformer ML300RTW

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I have a 600w transformer and it have 2 300w circuits. Can I use 600 watts through one line i circular line?

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There are two sets of terminals on the 600 watt x-former. If you have two 300 watt circuits, use one 300 W circuit on one output, and the other 300 W circuit on the other output. Use terminals A & B on each side. Each circuit will have 12 volts.

Posted on Jul 02, 2009

  • rohan
    rohan May 19, 2014

    can you set the two different timer settings for each of the two terminals?

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Lutron dimmer switch # D1500 1500 120vac Voltage to switch is OK but lights(8 100watts) do not go on.


I can't locate the Lutron D1500 dimmer switch on Lutron web site. Perhaps there is a different number for it.

Anyway, you are attempting to dim a total of 800 watts of light. A standard dimmer switch will not handle this much of a load as they are rated for 600 watts. A 1000 dimmer is the next size up and would be the minimum rating to be used. This means the dimmer would be operating at 80% of capacity and the switch may become warm - but all within acceptable limits.

A dimmer switch rated at 1200 watts or even 1500 watts may be a better choice, as the 800 watt load would present a load that would only be 66% and 53% (respectively) of rated capacity, and would likely run cooler and last a lot longer.

The down side to these higher wattage rated switches is their cost. It is not unusual for the price to double for a 600w vs a 1000w dimmer.

Sometimes, a 1000w dimmer is not sufficient to control a 600w load. This happens when 2 or more dimmer switches are installed in a single location under one wall plate. It is a fairly common arrangement for electricians to install 2, 3 or more "ganged boxes" so that there aren't 2, 3 or more individual switches clustered around a doorway. Even though a two ganged box has twice the area of a one gang box, the issue is about heat dissipation. A box will contain the heat. So the heat is given up from the front of the switch. The metal fins provide more area for cooling. When two or more dimmers are located in a multiple-ganged box, there is too much heat for the space. Two 600 watt dimmers would need to be derated to about 450 watts each (instructions for derating are included with the switch - each manufacturer has their own formulas), and if three 600 watt dimmers were in a single location, they might need to be derated to 300 watts each. So, simply moving to a 1000 watt or 1200 watt dimmer may not get you to the 600 watt level if there are several dimmers that require derating to 50%. Installing dimmers in boxes with standard "toggle" type (non-dimming) switches require no derating as toggle switches do not produce appreciable heat.

Make sure that the lighting load is a type designed for dimming. The popular CFL (compact fluorescent lamps) are not designed for dimming, unless the package specifically states otherwise. Lights that have a filiment but no transformer, ballast, starter, etc. are the only ones suitable for use with a dimmer (again - unless the package / fixture states otherwise). The dimmable types are typically "standard" incandescent, quartz, halogen and tungsten types.

Furthermore, a dimmer switch is not suitable for use as a fan speed control either. There are special switches to provide speed control of fan motors. Use of a dimmer on a motor load is a fire hazard.

I hope this helps & good luck!

Jan 08, 2013 | Lutron Electrical Supplies

1 Answer

Can a 600W dimmer handle 1200W of Lights? on 25% power or less?


No, Dimmers are basically resistance devices. The max load on them is not at full brightness anyway.

Nov 24, 2012 | Lutron + Leviton Dimmers Lamp Debuzzing...

2 Answers

Boosting output power


When you place the transformer in series you will be affecting the voltage on the output, placing them in parallel with give you the same voltage, but will increase the amperage output. Both transformers MUST be Identical. A switch must be used on the line side to disconnect Both simultaneously, for safety reasons.

Jun 08, 2010 | Intermatic & Malibu& 300 Watt Power/Pack...

1 Answer

Sould the ULT_LS6000P(600W) have a -5v?


Yes, if it follows ATX standards That should be the White wire.

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1 Answer

Hi, i have a 600w fusion amplifier in my house running on a transformer. when i turn it on the red light comes on but when it changes to green the transformer shorts out. its not the transformer thats...


How many watts is your power supply capable of supplying to a given load. There could be a problem with your amp. The quiescent current should be in the high mA to low A range which in no way would cause your supply to overload.

Dec 20, 2009 | Car Audio & Video

2 Answers

When controlling a 300 watt cable lighting system


Sounds like a loose connection. If they all fo out, it's at the beginning of the circuit. Check all connections at the start of circuit.

Sep 01, 2009 | Lutron Electronic Low-Voltage...

2 Answers

NEW 600W L.V.TRANSFORMER DOES NOT PRODUCE ENOUGH POWER


This is more than likely what has happened . I am going to guess that your original low voltage trasformer was a 120 volt .6KW. Or 600watt transformer that has one lead from it to the lights . The newer less expensive transformer is also 600 watts , but the new one may have 2 sets of wire terminals on the back( 4 screws ). If this is the case , you have a transformer that is 600 watts output but it has 2 seperate 300 watt outputs that won't run 600 watts from 1 set of output screws . You will have to seperate the lighting load and may have to run an additional low voltage wire to half of your lights . In other words . Put 300 watts of light on 1 set of 12volt output screws and 300 watts on the other se of output screws .that will solve your issue . Good luck and enjoy your lights again . John

Nov 03, 2008 | Garden

1 Answer

Landscape ligthing Transformer


Yes ican. They are made to be split into two 300 watt circuits. So it's ideal to place it at a location in the middle of you lights . Basically to go each direction from the transformer. Now you need to find out what wattage bulbs are in each light.(different fixtures can have different watt bulbs.) Lets say you have 8 lights going one direction and 8 going the other way and each light has a 20 watt bulb. That adds up to 160 watts on each side. So you are well below the 300 watt rating per side. By the way I wouldn't go anymore than 250 watts on a 300 watt circuit. Next you look on the bottom of the transformer and you will see the screws where you hook up the wire. You will need to strip the end of the wires about a half inch. Hook one set under the A & B for one side then do the same for the otherside. Plug in the transformer and set the timer to whatever tme of day and night you prefer. Hope this helps. If you have more questions just ask. Thaks and remember to rate me.

Oct 21, 2008 | Garden

3 Answers

2 12" Hitron 600w subs in a BandPass box


Remember that driving a load with an underpowered amp will probably cause more problems than having a more powerful amp that is not running flat out. 200-300W amp would be ok, but I would suggest going for the biggest you can afford. If you crank up the volume on the smaller amp you will probably get a fair amount of distortion, which may actually damage the speakers. A larger amp will not give as much distortion for the same loudness/volume and give better control of the speakers for a tighter bass..

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