Hello, this has to be one of the best videos I have seen describing an issue we amateurs face when installing receptacles or lights in a new garage or shed. Thank You so much, well done. Best Regards. 👍
Thank you!! Total electrical dummy but want to understand RV electricity and this video just “made the light bulbs come on” for me 😂 Really appreciate this!
Good explanation. Also, for the hobbyists out there, keep in mind that these calculations are for a circuit with only light fixtures. If you put anything else on that circuit, you’ll need to subtract that load to see how many fixtures you can add.
You can only have 12 total devices if you're mixing lighting with receptacles. How do you subtract a load from a lighting circuit when you have no clue what will be plugged in there in the future. These calculations are for KNOWN lighting loads ONLY.
@@That90sShow I never specified that receptacles would be on that circuit-it could be anything that draws power. My point was making sure folks not familiar with electrical work understand that if you add other elements to the circuit, the calculations change. Your number of 12 is also arbitrary-that would depend on the circuit amperage, draw of the fixtures, whether you have open receptacles or fixed loads, etc.
Exactly the info I was looking for! Pairing this with the other video you put up about outlets on a circuit, this is just what I needed. Thank you for the info!
I once lived in an older apartment that put EVERY light on one 20A breaker. Might have been needed when that wiring was done - but with my mix of LED and compact fluorescents, it was SEVERE overkill. I talked the owner/manager into adding a 15 amp duplex outlet to the circuit, as that place was WAY short on outlets.
Yes it did, thank you. At 67, Me, forgetting things that I had once learned makes me dangerous or a procrastinator. Now, using your info, I can finish up the wiring that I have allowed to mushroom by unsureness and to finish my music/woodworking barn with confidence. Once and for all. If you have ever said that you hope that you've helped one person, I am that guy. 🤠
Nice presentation . Simple and complete compared to what I learned back years ago . At that time when the instructor would illistrate the formula he would over complicate the calculations , doing too much math in the formula . Cheers 03/05/2022
Great video, especially as it helps me understand how my 75 year old house was wired. One observation however - the word is "continuous," not as you have it, "continuos" (@3:45).
Great! This is exactly what I need to know. Gonna be lighting up a basement and I don’t know how many lights I need or how many light to put on a circuit.
This is a great example but these days many people are getting away from the old screw base fixtures because you can still find bulbs of 150 watts and more. (yes, still out there) If you install NON screw base fixtures they will likely be a specialty base that can't accept larger bulbs and will be under 20 watts draw each. IOW, you have the added benefit of no fire hazard due to wrong bulbs overheating. Still, the math works out and it really is that simple.
Solar lighting has major potential market out there. Imagine basement lighting. No more scary basements. We dont live with basement anymore, but our north facing kitchen/living room got me into solar LED lighting. Plus, I love our bathrooms well lit for long long hours. Bright bathroom looks very clean.
FYI Building Codes are public domain and can be accessed online from numerous legal libraries. Call your local building department and ask them what Code governs your jurisdiction, and look up the residential electrical code requirements for branch circuits, etc. FYI, adding new lights and receptacles is easy renovation work, but if it isn't done right and to your local Code requirements, you can burn down your home or even electrocute yourself. If you have zero experience, hire an Electrician.
We currently have a Federal Pacific Stab-Lok breaker panel that we're planning on having replaced. After it's replaced, I do want to separate some circuits. I also want to put all the overhead lights in our house on one 15 amp circuit. All our lights are LED and even if our lights were all 100 watts, they would still not exceed 15 amps.
If you're wiring a house from scratch that is one way you can do it but typically every light in a house is off of a outlet. The reasoning for this is to reduce the amount of wire that is needed to wire the entire house. At today's costs I would not want to wire out that way as 12/2 is about $150 for a 250ft roll now.
We have a 15 amp breaker running from the house to a tool room, then by knob & tube overhead open wire to a carriage barn to a 2 car older garage to a large chicken coop/workshop. Along the way there are many lights, many outlets with multiple power strips, animal water de-icers, electric woodshop tools, and now outdoor blow up Christmas decorations requiring continuous running fans. Yeah...the 15 is tripping.
There's no limit to the number of outlets on a breaker. Of course your loads on that circuit can't exceed the continuous/peak rating of the breakers. Because on a 15A circuit you can put only two outlets on there, then plug in 1500W heaters trip your breaker. Or you can have a dozen outlets, half drawing a small amount of power and the other half unused and you're fine. This is why there's no number limit on the outlets. There is a 'rule of thumb' of 1.5A per outlet towards the breaker size continuous load. But in some cases NEC requires only 1 dedicated outlet per circuit. And for some areas you don't want more than 2-3 outlets on a circuit if you are expecting high current devices to be plugged in (kitchen counter).
@@That90sShow Bullshit. Check the NEC. No limit to number of outlets on non-dedicated circuits. PERIOD. Up to homeowner to limit number of outlets for specific purpose, like when I rewired my garage/shop with 4 circuits ((1-lights, 2-dust collector, 3-compressor, 4-multiple outlets for chargers and woodworking tools [planer, jointer, router, table saw, miter saw, etc] no way I'd run the 3 machines at same time on same circuit). A large living room could have 14+ outlets and be fed with 1 circuit since demand is low (LED TV, lamps, home theater, dvd, cable box) Just where did you get "12" from, smartass?
In the UK we use 230 volts. To answer your question in the UK we assumed total load and divide by 230 to get Amps , ie assume you want to install 12 lights on a 5Amp circuit with a 6amp MCB and the lamps are 100w each that would be 1200w divide by 230 = 5.2Amps , that’s the design current the circuit protection device should be equal to or greater than the design current. As you can’t get a 5.2Amp MCB You will need a 6amp MCB. This is international no matter what the nominal voltage is.
The electrical in the house I bought is a mess. My question is can I dedicate one circuit for each room? For instance my master bedroom has seven outlets and two ceiling light fixtures. Assuming the light fixtures were rated for 100 w each could I put all of this on one breaker?
Yes, thats how electrical contractors do it. One circuit for each room is the best practice. Just remember the kitchen, bathroom and garage lights and receptacles can't be mixed on one circuit.
Daaaamn Sam!! I know your name isn't Sam It just ryhmes with damn and sounds cool... But nice video sir.Very informative and easy to comprehend. Of course the 15 amp circuit would be using 14/2 wire and the 20 amp circuit would be using 12/2 wire. Now if you're using led lights, you can probably use more lights per circuit because led's consume alot less power than incandescent lights right?
No. Some local municipalities have limits on the number of lights and receptacles on a residential circuit. In central Florida they had a limit of 12 points, a duplex receptacle being two points and a light being one point.
What happens in a series parallel circuit. (Some led light bars daisy chain in series.). I think I want to daisy chain 4 light pairs (in series), but set each pair in parallel.
Hi, A ex-tenant angry by an home eviction, cut the power lines in the attic some of them tore to pieces is there any way to identify them or new wiring? If you made a video about it that would be great, thanks.
Can you substitute wattage fixture to 15 or 20 amp receptacles? Does this formula work the same to figure out how many receptacles you can use on a 15 or 20 amp circuit?
I love how simply you explained this! And in plain english. Thanks SO much!
Thanks
Perfect! Clear and to the point.
Hello, this has to be one of the best videos I have seen describing an issue we amateurs face when installing receptacles or lights in a new garage or shed. Thank You so much, well done. Best Regards. 👍
THANKS FOR SHARING. I’M STARTING MY ELECTRICAL JOURNEY AS A RETIREE AND THIS WAS HELPFUL.
Thank you!! Total electrical dummy but want to understand RV electricity and this video just “made the light bulbs come on” for me 😂 Really appreciate this!
Good explanation. Also, for the hobbyists out there, keep in mind that these calculations are for a circuit with only light fixtures. If you put anything else on that circuit, you’ll need to subtract that load to see how many fixtures you can add.
You can only have 12 total devices if you're mixing lighting with receptacles. How do you subtract a load from a lighting circuit when you have no clue what will be plugged in there in the future. These calculations are for KNOWN lighting loads ONLY.
@@That90sShow I never specified that receptacles would be on that circuit-it could be anything that draws power. My point was making sure folks not familiar with electrical work understand that if you add other elements to the circuit, the calculations change. Your number of 12 is also arbitrary-that would depend on the circuit amperage, draw of the fixtures, whether you have open receptacles or fixed loads, etc.
Exactly the info I was looking for! Pairing this with the other video you put up about outlets on a circuit, this is just what I needed. Thank you for the info!
I once lived in an older apartment that put EVERY light on one 20A breaker.
Might have been needed when that wiring was done - but with my mix of LED and compact fluorescents, it was SEVERE overkill.
I talked the owner/manager into adding a 15 amp duplex outlet to the circuit, as that place was WAY short on outlets.
Yes it did, thank you. At 67, Me, forgetting things that I had once learned makes me dangerous or a procrastinator. Now, using your info, I can finish up the wiring that I have allowed to mushroom by unsureness and to finish my music/woodworking barn with confidence. Once and for all. If you have ever said that you hope that you've helped one person, I am that guy. 🤠
Thank you for conciseness and clarity. So easy to understand and no fluff.
I have watched this video at least 15 times thanks again and again.
Thank you for this video I've looked all over TH-cam and never could find out what I needed to know until I stumbled upon your video much appreciated.
Thanks glad to hear it helped.
Nice presentation . Simple and complete compared to what I learned back years ago . At that time when the instructor would illistrate the formula he would over complicate the calculations , doing too much math in the formula .
Cheers 03/05/2022
This was very helpful, Thank you so much. Now I can plan my Christmas yard lights and know what I can run.
I use 250 watt infrared bulbs for therapy. You answered my question. Thanks
What about the number of outlets where you don’t know what will be plugged in and/or how many outlets will be in use at any given time
Great video, especially as it helps me understand how my 75 year old house was wired. One observation however - the word is "continuous," not as you have it, "continuos" (@3:45).
agree with other posts--very well explained video--very well spoken and easy to listen and follow along. Thanks!!!
Great! This is exactly what I need to know. Gonna be lighting up a basement and I don’t know how many lights I need or how many light to put on a circuit.
Informative video that everybody can use and was looking for
Thank you, Sir.. Bevins, your video helped me a lot, Super interesting and informative, I appreciate it. Good day. From the Alamo SA, TX.
Excellent presentation with even better explanation. Great job 👏
Thanks
Thank you!!!!! channel has really helped me do my fuzzy math!!!
Excellent video! Thanks for your thorough explanation.
Nice job, simple to the point
Thank you! Awesome explanation, clear and full of great formulas!
Thank you for a clear and precise explanation !!
This is a great example but these days many people are getting away from the old screw base fixtures because you can still find bulbs of 150 watts and more. (yes, still out there) If you install NON screw base fixtures they will likely be a specialty base that can't accept larger bulbs and will be under 20 watts draw each. IOW, you have the added benefit of no fire hazard due to wrong bulbs overheating. Still, the math works out and it really is that simple.
Solar lighting has major potential market out there. Imagine basement lighting. No more scary basements. We dont live with basement anymore, but our north facing kitchen/living room got me into solar LED lighting. Plus, I love our bathrooms well lit for long long hours. Bright bathroom looks very clean.
@@marktan3668 ... solar has it's place, but completely off topic for the question.
Thank you! I love the way you explained it.
Absolutely perfect explanation. Short informative. Thank you!
This is a great info. Thank you.
Awesome, thanks you taught me a lot in this video
Great video and well explained
Thank you so much! Wow with LED lights I can multiple that by X5! Lol
Almos 10x
LED lights have drivers and use more power than the light rating btw
Great video. Quick and to the point
Super straightforward! Thank you
This is way above my skill level as a do it yourselfer, but its very interesting how electricians figure it out.
Thanks this is so helpful, and understandable 👍🏻
Dude..... Bravo!!
Thanks, great video...😮
bless your soul, this was clear and informative.
Great explanation!!! Very clear, definitely helpful as I’m adding lights to my house, is good information to have, thank you!!
fastest ive ever learned anything! thanks
UK, we allow 100w per outlet. Lighting is on 6amp 230v circuit. Standard house split on 2 circuits. Older houses 1 circuit on 5amp rewire fuse.
Thank you🙏you’re the best
What if there are outlets on the same circuit?
Great video and explanation!!! Thank you sir
Are junction boxes still used to wire bedroom outlets with access from the basement?
Thank you so much! Straight to the point
Are LED lights calculated in the manner?
Yes
Excellent!
Thanks for a info
Very Very informative.
Ty. For your help
FYI Building Codes are public domain and can be accessed online from numerous legal libraries. Call your local building department and ask them what Code governs your jurisdiction, and look up the residential electrical code requirements for branch circuits, etc. FYI, adding new lights and receptacles is easy renovation work, but if it isn't done right and to your local Code requirements, you can burn down your home or even electrocute yourself. If you have zero experience, hire an Electrician.
BTW, I'm a former Journeyman Carpenter turned Architect in CA.
We currently have a Federal Pacific Stab-Lok breaker panel that we're planning on having replaced. After it's replaced, I do want to separate some circuits. I also want to put all the overhead lights in our house on one 15 amp circuit. All our lights are LED and even if our lights were all 100 watts, they would still not exceed 15 amps.
If you're wiring a house from scratch that is one way you can do it but typically every light in a house is off of a outlet. The reasoning for this is to reduce the amount of wire that is needed to wire the entire house. At today's costs I would not want to wire out that way as 12/2 is about $150 for a 250ft roll now.
Thanks love these explanations. Perfect
Exactly what I was looking for, thanks
Thank you👍
Thanks for making it simple and understandable
Thanks for watching :)
Excellent explanation 🎉
We have a 15 amp breaker running from the house to a tool room, then by knob & tube overhead open wire to a carriage barn to a 2 car older garage to a large chicken coop/workshop. Along the way there are many lights, many outlets with multiple power strips, animal water de-icers, electric woodshop tools, and now outdoor blow up Christmas decorations requiring continuous running fans. Yeah...the 15 is tripping.
Thanks great breakdown!
good one boss!can you please do the receptacles or outlet
There's no limit to the number of outlets on a breaker. Of course your loads on that circuit can't exceed the continuous/peak rating of the breakers. Because on a 15A circuit you can put only two outlets on there, then plug in 1500W heaters trip your breaker. Or you can have a dozen outlets, half drawing a small amount of power and the other half unused and you're fine. This is why there's no number limit on the outlets. There is a 'rule of thumb' of 1.5A per outlet towards the breaker size continuous load. But in some cases NEC requires only 1 dedicated outlet per circuit. And for some areas you don't want more than 2-3 outlets on a circuit if you are expecting high current devices to be plugged in (kitchen counter).
@@thebluelunarmonkey Quit giving fake news. 12 outlets allowed on a 15 amp circuit. Quit copy and pasting google search results, thinking you're smart
@@That90sShow Bullshit. Check the NEC. No limit to number of outlets on non-dedicated circuits. PERIOD. Up to homeowner to limit number of outlets for specific purpose, like when I rewired my garage/shop with 4 circuits ((1-lights, 2-dust collector, 3-compressor, 4-multiple outlets for chargers and woodworking tools [planer, jointer, router, table saw, miter saw, etc] no way I'd run the 3 machines at same time on same circuit). A large living room could have 14+ outlets and be fed with 1 circuit since demand is low (LED TV, lamps, home theater, dvd, cable box)
Just where did you get "12" from, smartass?
Thank You very much, I liked Your presentation, I subscribed too.
In the UK we use 230 volts. To answer your question in the UK we assumed total load and divide by 230 to get Amps , ie assume you want to install 12 lights on a 5Amp circuit with a 6amp MCB and the lamps are 100w each that would be 1200w divide by 230 = 5.2Amps , that’s the design current the circuit protection device should be equal to or greater than the design current.
As you can’t get a 5.2Amp MCB
You will need a 6amp MCB.
This is international no matter what the nominal voltage is.
The electrical in the house I bought is a mess. My question is can I dedicate one circuit for each room?
For instance my master bedroom has seven outlets and two ceiling light fixtures. Assuming the light fixtures were rated for 100 w each could I put all of this on one breaker?
Yes, thats how electrical contractors do it. One circuit for each room is the best practice. Just remember the kitchen, bathroom and garage lights and receptacles can't be mixed on one circuit.
Luxx 645 led how many would I be able to put on a 15 amp ? I’m confuse & curious
If using 645 watt lights thats 5.4 amps per light so a maximum of 2 on a 15 amp circuit
GOOD REVIEW.. THANKS!!!
Daaaamn Sam!! I know your name isn't Sam It just ryhmes with damn and sounds cool... But nice video sir.Very informative and easy to comprehend. Of course the 15 amp circuit would be using 14/2 wire and the 20 amp circuit would be using 12/2 wire. Now if you're using led lights, you can probably use more lights per circuit because led's consume alot less power than incandescent lights right?
:)
Awesome stuff!
Doesn't the NEC also limit the number of fixtures on any one circuit to a maximum of 12???
No. Some local municipalities have limits on the number of lights and receptacles on a residential circuit. In central Florida they had a limit of 12 points, a duplex receptacle being two points and a light being one point.
Thanks for the clarification @@JeffBanfield-t6v
What happens in a series parallel circuit. (Some led light bars daisy chain in series.). I think I want to daisy chain 4 light pairs (in series), but set each pair in parallel.
Ty for the info
All of my lights are connected in series (ohm my goodness). Cheers!
Good Content,GreatTips😀👍🏿
Thank you!!
That was very helpful information 👍
Great video, thank you so much.
Why are you dividing watts with watts ? Is that a different formula ?
I’m referencing off the ohms Law but doesn’t have watts divide by watts . Reason why I am confused
Does it matter how many light switches you put in one circuit?
Very good!
thank you for share this information
What if I were using 1.21 gigawatt bulbs?
Thank you for this.
Thx a lot.
Thank you big brother 🤲
Very well explained
Hi, A ex-tenant angry by an home eviction, cut the power lines in the attic some of them tore to pieces is there any way to identify them or new wiring? If you made a video about it that would be great, thanks.
good teacher
Thanks a lot!
What about one with both lights and receptacles? Thank you for putting these together they are very helpful
12 devices only if your mixing
Great video and great explanation 👍
Nice
Well presented.
Thanks
Cool😉👍🏽⚡️⚡️
How do you calculate that for outlets?
I have a video on that.
th-cam.com/video/0gs3cx01HEM/w-d-xo.html
Can you substitute wattage fixture to 15 or 20 amp receptacles? Does this formula work the same to figure out how many receptacles you can use on a 15 or 20 amp circuit?
Well How TF do you plan on calculation receptacle loads? Use your head
Outstanding!
Thank you!
I'm sure I regularly see 6,000 Christmas lights in every yard hooked up to one 15 amp outlet.
Will this process still work for DC? I have ac/dc inverter that’s 12v 5amps 60w and I’m trying to see how many 5w 2 amp led lamps I can use.