Question about Intermatic K4221C Photo Cell Control 120 V 50/60 Hz. 1800 Watt "T" Swivel M

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I need a photo cell that will handle an 18 amp load.

I am running neon transformers on one circuit, 18 amps total, The K4121 that I have now is overloaded. Do you have a photo cell that will handle 18 amps. 120 volt?

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I didn't find one. i recommend a relay circuit. use low current to switch high current.

Posted on Dec 17, 2008

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How much load of two ton Ac


30 Amp X 2 would seem to be a 60 amp draw MAX, easily handled on an individual 30 amp circuit, providing they were not running non - stop. I would not run 2 AC's on any one home circuit. One 2 ton unit requires a 30 amp breaker for individual use.

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see pages 44 & 45 of attached pdf to figure out your power requirements for all locomotives, lamps/light bulbs & accessories.
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No lights upstaires circuit breaker keeps tripping


Jan 2013
1) Move wire to another same-size circuit breaker to eliminate bad circuit breaker as suspect.
Do NOT increase size of breaker or it will cause fire.
http://waterheatertimer.org/How-to-replace-circuit-breaker.html
http://waterheatertimer.org/Troubleshoot-household-electricity.html

2) Put hand on each appliance and outlet to see which ones are warm. Outlet should never be warm or hot. Replace outlet. Inspect wires for loose and burned connections.

3) If the breaker is good, then add up total watts being used by checking watt rating on each device. 100 watt light bulb is 100 watts. Big screen TV has a label that shows 300 to 500 watts. Computer has label. Space heater has label showing 1500 watts. Iron has a watt rating label. Take total watts and divide by 110Volts and this will give amp load. Total watts used = 2000 and then divide 2000 by 110 volts = 18.8 amps
Compare amp load with circuit breaker.
20 amp circuit breaker has 80% safe maximum, or 16 amps.
If amp load is 18.8 amps, then 20 amp breaker is starting to get hot, and weak breaker will start tripping.
If amp load is 18.8 amps, and breaker is 15 amps, then you are overloaded and breaker is feeling the heat, and tripping because of heat.
Solution is to reduce amp load.

4) If you have short circuit, that can also trip breaker.
Unplug everything and then plug things back in slowly to see which plug or appliance is causing the problem.

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1 Answer

We have a lutron nova 2003p (1600 watt) switch supplying power to a line of 18 12 volt, 50 watt lamps. switch went out. is this caused by over-amperage draw?


Hi John, I'm an electrician and I think I can help you with this problem.

First and foremost, this switch's 2000VA / 1600W electrical rating is based on a incandescent load.

Let's do do the math on this one.. 18 x 50 = 900 watts. So, you're under the 1600 watt capacity, but I think this is a bit more involved than this.

I'd be willing to bet that you're not dimming a 12 volt circuit - but rather a 120 volt circuit that supplies one or more transformers that step the power down from 120 volts to the the 12 volt bulb voltage. A transformer is an inductive load. A transformer's inductive load is completely different than the incandescent load the dimmer is designed to control. The transformers are rated for 120 volts and will have issues including heat problems if provided less than the rated input voltage to provide a reduced output voltage you want so that you can dim these lights.

This switch will not work on the output of the transformer in this situation either because the significant amperage being switched here. Each of these lamps draws a bit over 4 amps as determined by ohm's law: 50W / 12V = 4.16A. The total load at 12 volts is (again, Ohm's law) 18 x 4.16A = 74.88A ! That means the wire would need to be a #4 or #2. This is about the size of the cable on your car's battery (only amperage determines conductor size - voltage determines insulation).

A dimmer on this circuit will not work unless the fixtures are changed so that no transformers are used to supply the lamps. This includes fluorescent lamps (compact or otherwise) unless the packaging specifically states that they can be used on a dimmer.

You may wish to contact Lutron Hotline at 800-523-9466 for additional help and suggestions. I hope this helps & good luck!

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My Pfaff 1471 lights up, but does not run. This model has no fuse. I checked the foot pedal with an ohm meter, & it sends a variable signal. My house took a direct lightning strike 2 weeks ago, &...


Were the base plate pugs into the power leads, you should read about 6-18 is ohms. Open and short is a bad transformer.

Also there are fuses, 2-3 right next to the transformer, small blueish and round are the shapes. They go bad often.

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1 Answer

Breaker installed on generator. Keeps tripping under no load after approx. 1 minute of generator running


A tripping circuit breaker is an indication of an overload. You say there is no load on the breaker - how are you making this determination? Are you using an amprobe or some other meter?

A circuit breaker with NO load shouldn't ever trip. Likewise a circuit breaker carrying up to 80% of of the current it is rated for shouldn't trip either. Circuit breakers that carry more than 80% of their load will trip - if the load remains connected long enough. This is called "duty factor" or "service factor" The greater the load is in excess of 80%, the less time that the breaker will carry it before tripping.

An example of a 100 amp breaker with different loads on it (this 100 amp value was chosen for ease of doing the math):

80 amps - never trips
85 amps - trips after 48 hours
90 amps - trips after 16 hours
95 amps - trips after 8 hours
100 amps - trips after 4 hours
105 amps - trips after a few minutes
120 amps - trips after a few seconds
150 amps - trips instantly

This is only an example to show how a certain circuit breaker might trip under a load less than the rating stamped on the body or handle.

A circuit breaker that trips with no load or a load equal to or less than 80% of its rating is most likely defective. You need an amprobe or ammeter for amp readings. If the load is found to be 80% or less, there may be an issue of harmonics that is causing the tripping. You'll need to have special equipment and qualified persons to check harmonic problems. Most harmonic problems occur when the loads are not linear device (transformers). Examples of non-linear devices are "switching" (or solid state) power supplies like those in computers.

I hope this helps and good luck. Please rate my reply. Thank you.

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Hi,

I would get an amp metetr on it and see what the load is.... if it is running continually at over 40 amp. then you are overloading it...and need to shed some load...

If it is not then the breaker is going bad and needs to be replaced...

heatman101

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If there is a 15 amp breaker on this circuit now. Then I would assume the the wire to this breaker is only capable of handling that size and NOTHING larger. There are to many variables. You need to know the maximum amp draw rating of the device. The wire size going back to the service entrance (fuse box). You will also need to know the total power draw of the service entrance to determine if the box can handle the total load. Are there any other branches off of this circuit? I suggest that you get advice from an electrician. If you overload the circuit, you may think everything is ok. But you can cause a major problem. I do not think that you want to take the chance of overloading a circuit. This can cause a fire and or death. Have this inspected by a professional. If you insist on doing it yourself.... contact your local building inspector for guidance.

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