@LionelHutz Yes I agree on both points you made. Lol.
Thanks for everyone's input. No I am not going to use 120VAC. I am using a 12VDC NOMINAL supply and it is by no means accurate - I'm buying the thing for $25. BUT for my purposes it is fine.
No more comments needed here. This thread can...
Guys, thanks for your feedback
I also found a great little tool recommended to me by the store I'm purchasing my LED's from (Jameco). VERY useful for my application. http://led.linear1.org/led.wiz
http://politicalplangetis.blogspot.com/
Mike,
What truth do you see to this statement?
"Do not put LEDs in parallel with each other. Although this usually works, this is often not reliable. LEDs become more conductive as they warm up, which may lead to unstable current distribution through paralleled LEDs. LEDs in parallel need their...
Thanks for the snarky comment, lol. I thought more about it and I think I have an answer, I'll throw all 80 LED's in parallel, and add an appropriate sized resistor in series with this parallel string to eat the additional voltage, and I should be good to go...
Some additional background information:
Most LEDs have their characteristics specified at a current of 20 mA. If you want really good reliability and you are not certain you don't have worse-than-average heat conductivity in your mounting, heat buildup in wherever you mount them, voltage/current...
I have a question with regards to LED's. I have a power supply that supplies 3, 41/2, 6, 71/2, 9 and 12VDC (nominal). Materials I'm using:
Aforementioned power supply
Circuit board
~80 Red LED's, "high" intensity (...
@ jraef
Is there a chart you can link me to online that shows NEMA rated contactors and their associated continuous amp rating?
Thanks
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Hello all -
I've got a 40 kW resistive load (heating elements) powered by 480V, 3ph. So FLA = 40kW / (480*sqrt(3)) = 48amps.
I require a contactor for this heating load (ie size 1, 2, 3 etc).
Can someone provide a table or chart that shows contactor sizing based on the resistive load?? I...
The installation is actually in Canada. I'm not sure what Canada's government is doing as far as legislation goes.
For the comment regarding the life expectancy of a bulb based on voltage: where would Ifind this in the NEC?
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Free-market politics and...
These lights do not have ballasts. They are incandescent lights. The lights are being used in a Beacon Flasher Assembly. The lights are being installed at various places on a silo.
What we are more than likely going to have to do is change the entire assembly to 208V...per the recommendation...
Hello all
I've got a 208V power source single-phase. Turns out the light fixtures I have are 240V. Any harm in powering the 240V light fixtures from a 208V power source?
Let me know if I can clarify anything.
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Free-market politics and money-making stocks.
Thanks Bill.
This is a NEMA Design B motor. KVA Code = "H". FLC = 231 Amps.
I will try to find what the load typically is during this investigation.
I do know the motor is started/stopped around 6 times a day.
Hello all, I've got a 200 HP Motor powered by a 400 kVA transformer with 3.68% impedance. This motor is full-line starting. This motor is the only load on this transformer other than a small lighting panel ~20 kVA.
Having said this, the customer who owns this transformer is telling me the...
Lol its for work. I finished school 2 yrs ago, never learned this stuff there, learning it now. I am assuming pf and efficiency are both around .85.
Anyways sounds like no one can actually answer my original question, I will ask chief electrical guy tomorrow.
