Obviously one can't come up with two different answers. What do negative phonon frequencies signify? Kilowatts = 1,000 watts and Watts = AV so you are looking at:: 120 volt line 15,000/120 = 125 amp breaker, 240 volt line 15,000/240 = 62.5 amp breaker. You are right in that the instantaneous peak current is higher, but for sine waves it is higher by the square root of 2 from the RMS, not the square root of 3. For DC power supply, amps are equal to watts divided by volts. However, the Amp rating of these thermal limits switches are almost certainly RMS, not peak, check the datasheet.

Example: How many DC amps will a Vanner 12 volt inverter require to operate three 500 watt quartz lights, or a 1500 watt electric heater? 5 kW * 1000 is 5 MW, not 5000 W. Also, the correct units is kW (killo-Watts), not KW (Kelvin-Watts)). He is a Fellow of the Royal Geographical Society and the Royal Meteorological Society. I am programming an app for ordering 3 phase heaters, and I have an argument to resolve with a coworker. On each leg there is a thermal limit switch with 25 amp rating. I am a mechanical engineer with basic understanding of electricity. It never hurts to go higher. 24 A RMS therefore has peak currents of 34 A. When a few lights or a television are on the same circuit, the 15 Amp limit is quickly reached and the breaker will trip. The correct location for your limit switch in a Delta configuration would be 1 limit switch each in series with only one element. Round the calculated value up to the next whole amp. E.g: 5e3, 4e-8, 1.45e12. How can I remove the knob from the door which has an invisible screw. You can sign in to vote the answer. Water heaters running on 120-volt power have a long recovery time, which is impractical for most households; 120-volt elements consume 1125 watts, while residential 240-volt heaters … That does not mean it is rated to carry 25 Ampere under any other particular condition: that's not the way high current switches are normally described. I am getting a total electric heat pump installed and the contractor is say it will take a 90-100 amp breaker and that I have to upgrade my meter base to 200amps. New speed = 0? If the switch is never tripped it should live a reasonable time. Would the rest of the UK lose anything more than honor if Scotland exits the UK? Equivalent Watts and Amps at 120V AC. Gaining a new type of movement speed after being hit by a Sentinel OA. Each element is apparently driven with 208 V accross it and is drawing 5 kW of power. Also most manufacturers would put that limit switch in the contactor control circuit where it has little current passing through it and lasts a long time, you only need one and it can be a 1 amp limit switch, that is if you're limiting temperature. To be safe add 20% (80% efficiency) to the amount of amps. Any electrician bases total load to 80% of what the wire can handle in amps. For a delta connection line voltage = Phase Voltage. Having a switch rated for 25 A regularly carry 24 A loads for sustained periods of time is asking for trouble. It's all a question of where the design margins are allocated. wattage to amperage conversions at 120 volts. Why are both the Trump & Biden campaigns visiting non-competitive states in the days right before the election? Before calculating the load, look on the appliance for the manufacturer's data plate. Many manufacturers thrive on repeat parts sales. Alternatively, read the printed data sheet accompanying the heater. I have to go with the Electrician, however who is going to warranty the system, find a new HVAC contractor. why do I have mold on my ceiling and wall?

How to Check an Electric Baseboard Element for Resistance & Continuity, How to Check the Continuity on a Water Heater Element, How to Hook Up Two Baseboard Heaters to One Thermostat, United Electrical Services: Estimating Your Appliance Costs. Thus 15000 =220 x ? The contractor is right, as voltage drops the amps go up, and per the mfg specs the max breaker allowed would be 90 amps, with 4 awg wire.

Since I1 = I2 = I3 = 41.7 amps in each leg, I need to split into two branches to divide the amps into two because of the 25 amp limit switch. For example, a heater designed to output a maximum of 2,000 watts will be rated as a 2kW heater. rev 2020.10.30.37923, The best answers are voted up and rise to the top, Electrical Engineering Stack Exchange works best with JavaScript enabled, Start here for a quick overview of the site, Detailed answers to any questions you might have, Discuss the workings and policies of this site, Learn more about Stack Overflow the company, Learn more about hiring developers or posting ads with us. amp = watt / volt. So in theory, these 25 A limit switches can handle your 24 A load. Flight Levels shall be transmitted by pronouncing each digit separately. The electrical load of an appliance, such as a heater, is the current drawn by the appliance while it is switched on. Watt = Volt x Amps. I_Ph = 15000W/(3*208) = 24.04A. What are you going to do, go to the customer when the inevitable failures occur and wave the datasheet saying "But it says here it should have worked"?

MILP formulation for minimum set Vertex cover problem. He has written for the "Telegraph" and "Guardian" newspapers in the U.K., government publications, websites, magazines and school textbooks. DC kilowatts to amps calculation. How do you think about the answers? If you're limiting current then you would use a current limiting relay to monitor the current in the contactor with 1 contact set used to interrupt the contactor coil.

It only takes a minute to sign up. Use beefier limit switches or split each 5 kW load into two 2.5 kW loads, which will draw only 12 A each and will be fine with the existing limit switches. And how should be FL200 transmitted?

If more than one heater is involved, calculate the load for each heater, and then add them together. Notice that the question was asked in 2013. You can calculate (but not convert) the amps from watts and volts: Amps calculation with voltage of 12V DC.

Therefore : Amps calculation with voltage of 120V AC

Also when the heat pump is started the amp usage will spike to well above 90Amps the get things running. Since I1 = I2 = I3 = 41.7 amps in each leg, I need to split into two branches to divide the amps into two because of the 25 amp limit switch. I_Ph = Pt/(3*V_L) The Overflow #45: What we call CI/CD is actually only CI. @Dave Tweed A 25 Amp switch is rated to switch 25 Ampere under specified conditions. The two phase currents have equal magnitude, but are 120 degrees out of phase.

Locate and record the maximum wattage rating.

It's a little iffy, because even though you can do the direct amperage conversion, you have to figure the surge of the start up motor, you have to be able to handle that. Instead of trudging up and down the stairs to reset the breaker or replace the fuse, only to have it trip again, the load on that circuit must be reduced. Amps to kW calculator * Use e for scientific notation. This is just bad engineering. So it comes down to how much you trust the manufacturer and how much.

Podcast 282: Stack Overflow’s CEO reflects on his first year, An overseas company is making a machine for me and they need to know whether I want 1,2 or 3 phase and what voltage. Electrical Engineering Stack Exchange is a question and answer site for electronics and electrical engineering professionals, students, and enthusiasts. Why do the brakes "freeze" the suspension? My thought is that even though on average each element is producing 5 KW of heat, instantaneously it might be producing more than that, as long as all three elements together are producing 15 KW at any given instant. Underestimating the load applied by a heater could result in electrical problems ranging from fuses blowing through to house fires. Does Windows know physical size of external monitor? Should I sell my home or try to repair the issue? A 1500 watt space heater (on high setting) will draw 12.5 Amps. It is also known as the current and is measured in amperes, an SI unit named for the French scientist André-Marie Ampère. Total Power (Pt) = 3*V_L*I_Ph.

My calculation for amps in each leg is 15KW*1000/[208V*1.73] = 41.7 amps. amps = 1200W / 12V = 100A. You co-worker is right in calculating the current per element.

Rearrange to get:

If you are calculating the load for another person, make sure that person understands you are calculating the current in amps and not determining the power consumption over time, which is expressed in kilowatt hours. That is 15000Watt = 200Volt x 68.2Amp. that's all i can tell you on that. He holds an honors Bachelor of Arts in geography and education and a teaching certificate from Durham University, England. On each leg there is a thermal limit switch with 25 amp rating. The total KW of the heater is 15 KW. I don't know who's right, but you need to run at least a 220 volt line. If it is often operated at 96% of rated load I would not expect it to last very long if it was intended as a safety switch and not a thermostat. It all depends on the application requirements. As a practicing component-level troubleshooting technician after 40 years I can tell you that you want 15 to 20% over rating for those switch contacts, wire and terminations, Unless you like to sell parts. How to Tell the Size of a Lawnmower Battery, How to Tell the Wattage of Electric Baseboard Heaters. Why is the electrostatic force felt in straight lines? What do you call pieces of cardboard with political slogans on them?

So no need to branch for the thermal limit switch.

If it doesn't, it's a bad switch. Still have questions? References United Electrical Services: Estimating Your Appliance Costs This works because watts divided by voltage equals current. Is creation of new states via partitioning really possible in the US? Can I use WhatsApp to securely send public key, symmetric key and private key? Therefore, he's going to make sure his switches have an actual capacity in excess of 25A to begin with, in order to cover the statistical distribution from manufacturing tolerances, test equipment calibration, aging, etc. Should You Plug Anything Else in With a Refrigerator? This often states the maximum load, alongside the wattage. this means you need; 2 double braid b-x wire conduit lines, 2 20 amp breakers. Thus 15000 =220 x ? Always double check your calculations. However, in the end I agree with you.

If 208V is your line voltage, then the current per phase will be 24A. Does a 50-Gallon Water Heater Cost More to Run Than a 40-Gallon? Because 1 kilowatt is equal to 1,000 watts, it is possible to use the formulas above to also convert kW to amps, but watts need to be converted to kW first. who is wright.? 5 kW / 208 V = 24 A, as he said.

Join Yahoo Answers and get 100 points today. Treating each leg separately, one can treat it as a 'single phase' circuit with 208V across the element. The current I in amps (A) is equal to 1000 times the power P in kilowatts (kW), divided by the voltage V in volts (V): I (A) = 1000 × P (kW) / V (V) AC single phase kilowatts to amps calculation.

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