Breakers, Wires, Fuses, and Overloads

[@jimmylee1856]

Hello When you have this class again please let me know

[@BJ-yc9ox]

HVAC tech here, more companies need this in the workplace! An emphasis on learning the "why" and "how" things work, not just providing enough tools and knowledge to get the job done. Appreciate everything that gets uploaded on this channel!

[@ShadowzTubez]

Training is just as important to me as pay. Your shop is lucky with all the resources you provide them. Thanks for uploading these videos and the podcast!

[@murkyturkey5238]

What a blessing to watch this at home huh 👍

[@jeremybenson516]

Best dude I ever seen, he bounces around butt who wouldn't just talking to a class!!! Thanks

[@LearningInVR]

not really in hvac tech but this channel has helped me so much

[@allenjay6065]

Bryan is rather amazing. If you watch him, you can see he has all this information in his head already. He is not reading from a script. He has so much past EXPERIENCE with this field, it is a normal part of his thinking. Incredible how much information he has memorized. Probably the best HVAC-R man IN THE COUNTRY! I am a licensed HVACR specialty electrician in the state of Washington.

[@JaimeMartinez-hd2dk]

Thank you Bryan. Keep us cool; with your training. I'm a new universal technician and I very much appreciate all your help 🙏

[@johndude04]

This is an amazing presentation as always. Keep up the good work HVAC school!

[@grashoprsmith]

I really appreciate the text summary in the description for quick reference!

[@nathanhurst5155]

Thank you very much for these class style long format videos. I’m training an apprentice right now and am having him watch all of your videos and listen to the podcasts while we’re in the truck from house to house. 👍🏻👍🏻

[@Joe_Joe_The_HvacMan]

Thanks Bryan. I will be showing this to my Advanced Electrical class at school. I do teach the "breaker protects the wire" and the disconnect protects the unit unless it is a non-fused disconnect and then I say size the breaker to protect the unit but still follow breaker size for wire and unit just to be safe. Also, thanks for the clarification on the "romex" inside seal tight conduit. DID NOT know that! Make since that all "whips" are individual conductors and not romex. Good job sir!

[@johnd4348]

Breakers can trip due to high heat also. Most have a thermal setting that they will trip if they get hot but the amps are below the current rating of the breaker.

[@kennymcguire5252]

Ok ok lol

[@murkyturkey5238]

Odds are if it’s too hot it’s overamping though

[@jordanhenshaw]

They exclusively trip based on heat.

[@garbo8962]

Reason they came out with requiring GFCI protection on all condensing units in the 2020 NEC was somebody got electrocuted when they touched a grounded condensing unit that was not grounded. Was told that at an IAEI continuing education class. Also must supply GFCI to all electric dryers and all residental receptacles 50 amps or less. Should mention that in at least comercial & industrial sitrs you ate allowed to use equipment GFCI circuit breakers that trip out at 30 milliamps rather then the normal 5 milliamps. Had a double sided 6 door 120 volt refrigetated unit that keep tripping out a 5 milliamp GFCI bolt on circuit breaker. Spent time running up to 1.000 volts DC from a megger to everything but control board. Never found any leakage nicked wires etc. . They replaced the 5 milliamp trip breaker twice nut still would trip every 5 to 7 days. Never tripprd the 30 milliamp GFCI equipment bolt on circuit breaker.

[@jaysonparanal9551]

It may become worse due to non tripping or no tripping !

[@garbo8962]

Read in two diffetent places that contractors are having very large # of GFCI trips on some residental split units ( wall hung ). Only a life long sparky. Some locations allow these units to not having to be GFCI protection.

[@edgarkerr234]

I think that the apparent disagreement about the max circuit breaker rating between electricians and appliance engineers is due to the point of view. NEC is concerned about distribution of power. Appliance Engineer is concerned about the appliance. You are paying attention to the appliance rating as per the nameplate. The win win solution is the current practice. Adding a sub-breaker at the vicinity of the condenser rated according to the manufacturer will protect the appliance. Similarly chemists see electrical current as movement of electrons but physicists see this current from the potential energy coming from the power supply. Both are correct. Another analogy, ophthalmologists will write a prescription according to the condition of the eyes but optometrist will write the same prescription according to the eyeglasses required by the patient’s vision. Both are correct. I am a retired appliance technicians but it’s only now that I understand why point of views differ.

[@texture6]

In the beginning of the video PSC motors and static pressure came to mind. It’s also nice to start think of refrigerant and density, high density needs more HP and low density needs less HP. You could jump into your SEER rating and energy consumption, like in a 4 season environment

[@Stuart68505]

Very thorough & helpful

[@tomk2471]

Thanks again for taking your time to make this video. Very informative

[@glenn3442]

Why do loose contacts get hot and melt...Joules law, not Ohms law. It is to do with power, P=I²x R so a good connection has no resistance therefore no power but if the connection is loose the resistance increases and even though the current is decreasing the power (W) will increase and cause more and more heat. Hope this helps not confuse.

[@garbo8962]

Done thousands of PM's and even a brand new motor starter contacts will have some voltage drop. Usually 3 to 10 millivolts for small motors but on piece of crap junk type IEC motor starters always at least twics as much.

[@jordanhenshaw]

A missed component of this is that the reason true shorts trip immediately and lesser shorts trip slow is because the breaker doesn't read amps, it trips based on heat. More amps means more heat, but if the amperage is only a little over, it takes time for it to heat up such that the breaker trips. When it's a true short of less than 1 ohm or so, it heats up fast enough to trip instantaneously. Also GFI's are typically only used in wet locations to protect against water. Think hair dryer falling in the bathtub. That may be why GFI requirements would be coming to the outside unit and not to the air handler. I've never seen a GFI in a dry area. I guess the evap does have a drain line for condensate, but that wouldn't really warrant a GFI.

[@shannonhill3356]

Is it possible to sit in on these classes and or meetings as a non-employee? I live in Central Florida, Sarasota area, and would love to actually be able to participate in some of this training that you do. I'm still within my first year in the industry, and would really like to get started proper instead of having to fix any bad habits later down the line. I found your channel, and have been watching your videos since day one of trade school - You're an absolutely indispensable source of information for text new, old, experienced or otherwise. If it is possible to join in on some of these, is there a schedule that is kept in posted somewhere? Thank you so much for everything, even just sharing your Monday meetings is amazing.

[@mostlikelywedoitservices6926]

What I have heard. Running a breaker at full amperage shortens the life of the breaker. For continuous operation 80% or less continuous amperage draw of the breaker rating will give greatest operation of breaker.

[@tonym6920]

Great class, 👍👍

[@rogerbettencourt9654]

That’s not “the office” that’s the Shop baby! Lol.

[@the-beloved-king1026]

Another great set of lessons! Ty

[@joshpearson1693]

Do you plan on making these last few videos into podcast?

[@mattphillips538]

The arc fault breaker heats internally because it contains an harmonic approxillator

[@allistersorrells2730]

Excellent! but you missed one thing for conductor sizing..... The terminal temperature rating, MUST be considered when sizing wire. On both sides, that is line and load. 20 year Journeyman Wireman here. I just had a light bulb go off, no pun intended. Electricians should study HVAC! the explanations really stick when in the context of HVAC. You guys have to know this stuff but us "dumb" electricians just bring you the power and we are done.

[@shine-cg9uf]

Great class! 👍

[@cyrilasfrenchyaz]

Hi Brien, that's another great video, thank you. Do you know if the same rules apply for tinned foiled copper wires? Are they allowed in HVAC applications? If so which ones and why and why not? Just curious.

[@johncotter9082]

You forgot the no blow fuse. That's when you put a bolt in the fuse holder

[@r1cky42]

How am I sure if a unit being fed by a cooling tower that trips the breaker when we plug in the compressor is going out on overload or a short circuit

[@murkyturkey5238]

Check amps and check for shorts right?

[@murkyturkey5238]

I’m sure I’m missing something lol never worked on that

[@r1cky42]

Thanks guys and yeah definitely check for amps turns out the compressor was protecting itself because it was rated for 115 v and the supply power was 220 they installed the wrong compressor

[@garyo8546]

i don't know but when i amped any motor low speed drawed less amps then high but if its a single speed motor and your loading the motor up then it would draw more

[@mostlikelywedoitservices6926]

Cool learned something I knew about but did not understand the why. Motor amp draw and why in overload amps go up.

[@connorm.6253]

Great content, great resource.

[@ABC-wz2db]

I read the tag as overloRds.

[@garypoplin4599]

17:30 - Brian, are you referring to the new arc fault breaker requirement here?

[@Samlol23_drrich]

This is great

[@michaelkeller6087]

I had no idea NFPA originally wrote “The talking heads “ burning down the house.

[@HVACS]

Yes... its a true fact

[@garbo8962]

Aholes like changing names after being popular last 100 years. No more light fixtutes now luminarrs no more nuetral conductors now confusing grounded conductor. Bonus round was never anything in NEC as a wire nut = pressure connector & Romex and BX cable.

[@AliAhmadi-hq9pj]

Love your videos thanks 🙏

[@jenko701]

Your best video

[@yupinmywhitet2]

@Brian I’m shopping for new mostly residential light commercial vacuum pump, do you have any discount codes or does anyone on here have any discount codes

[@franklineastman3349]

Vary informative

[@coldfinger459sub0]

First few minutes in my first thought it would make a great collaboration between Mike Holt Brian Orb electrical HVAC video

[@garbo8962]

Attended 2 of Mike Holts seminars at an IAEI meeting. Very smart guy. View his code question & daily graphic 7 days a week.

[@coldfinger459sub0]

@@garbo8962 When I discovered his KZbin channel my son and I went all the way back to the beginning and started watching all his videos. Can never gain enough knowledge about electrical especially when you’re in HVAC

[@fosterhensleycm8378]

Recommend “Mike Holt’s Electrical Toolbox” app you can go to Residential air-conditioning or commercial air-conditioning. You can put in them what’s on your nameplate, the maximum protection and your minimum circuit ambient and he gives you a whole list of the wiring and that you’re allowed to use.

[@donnierobertson3088]

Great job. A+

[@logicalrat]

One sec grabbin some popcorn 😎😎

[@johnd4348]

Fuses, ? We don't need no stinking fuses. Preceeds to put a 5/8's copper stub in a fuseable disconnect.

[@xraceboyex]

Ive found fuses replaced with 3/4" copper pipe before 😂

[@globeflicker9216]

Those never blow fuses, nothing like a piece of Cu keepin things safe. I always pull em out.

[@garbo8962]

Worked at a large always extremely cheap gannett newspaper when they were doing great. Took cheap SOB'S 10 years to purchase two 1200 amp fuses for a safety switch that feed air compressors needed to run printing presses. Boss said just to install a piece of copper tubing. Told him that I would quit before doing that. Never purchased even one pair of rubber gloves needef to work on energized circuits.

[@globeflicker9216]

izzy garbo Well, did ya have to quit? I would never endanger my coworkers. I’ve seen ‘no blows’ ark welded and that’s the least of the clients problem at that point. Personally I won’t touch any work without correct PPE. It’s what you over look that will get you, no matter how ‘experienced’. A Good day is when nothing happens, a Great Day is when you make it home safe when it goes sideways.

[@rogerbettencourt9654]

That is a good song

[@biker55555]

Does anyone know why manufacturers specify higher than necessary (vs the min circuit rating/wire) max OCPD rating? why not strictly limit the OCPD to the minimum circuit rating (even though, technically, it could use a higher rated OCPD).

[@josephschroen5093]

Because when the unit starts it is starting from a locked rotor position so the larger breaker is covering the inrush current on startup. It’s so the breaker doesn’t trip when the unit is starting

[@mikeadler434]

👍👍

[@ClickyMcbuttons]

Jandy was here

[@mostlikelywedoitservices6926]

A contractor I remember installed at the main panel the correct size breaker And at the condenser a larger breaker. Inspector said not passing. Contractor reason was because running the small breaker at condenser could trip out. I never understood that one. So contractor installed breaker got inspected and then inspector left then contractor changed the breaker back again. Can someone fill in what I am missing please.

[@murkyturkey5238]

He used a bigger disconnect at the condenser? Like a 60 amp instead of a 30amp?

[@mostlikelywedoitservices6926]

@@murkyturkey5238 Yes

[@mattphillips538]

#UBTrippin

[@wantedkiller23]

Sposed!!

[@Trust_Jesus]

I always be straight up trippin G

[@444MarlinSS]

Lower the voltage, higher the current.

[@HVACS]

Nope

[@444MarlinSS]

@@HVACS watts ÷ by volts = amps(current)

[@bryanorr8818]

@@444MarlinSS but watts do not remain fixed because E=IxR - In some cases what you are saying is true if there are controls in place to keep wattage fixed but with no special controls amperage decreases when you decrease voltage becasue resistance is the most fixed element in the circuit. Even resistance is a moving target in inductive loads becasue Inductive reactance reduces along with decreased motor speed but even then... rest assured.. if you drop voltage to a typical motor with no special controls the current will decrease... I know becasue I've done it many times.

[@leonardkimbler3689]

Talking Heads (Burning down the house)

[@realestateservicessaleshea99]

🍺😎👍🏻

[@necrobusher]

Talking head is the group burning down the house

[@BartSimpson-nr1dy]

Actually, being an Ohioian, the Ohio Players certainly had a better and most appropriate song dedicated toward the most ill prepared electricians; FIRE 🔥

[@ryans5473]

Straight up trippin yo

[@bethisway]

You sigh after asking a question shows you think you're wasiting your time. Try to enjoy these more and not be a boss teacher.