What's the Difference between MLO and MBR Panels???
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- Опубликовано: 31 май 2024
- Very little difference when we see a Main Breaker and a Main Lug Only panel, but their applications vary quite a bit. Most uses of a Main Lug Only, or MLO, consist of remote distribution panels, or sub panels as we call them in the trade. More often than not, we will come across a Main Breaker Panel, or MBP. The most important thing to remember about These panels It's to deenergize the bus or everything downstream of thing down stream of the breaker. The way of terminating In these panels is also a little different. In a main breaker panel we terminate the grounds onto a groundbar and the neutrals onto a neutral bar and if it's our 1st means of disconnect we also bond the neutral and grounds together. And we terminate the ungrounded conductors onto the main breaker as normal. In a main log only panel, The main logs are attached straight to the bus bar and cannot be switched off at that panel location. The grounds and neutrals would not be bonded together in this panel in this panel because it would not be the 1st means of disconnect. Hope you enjoy the video stay tuned for more like it.
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You could be doing anything else with your free time, yet you make videos to teach/better us. All i can say is thank you! I’ve learned a lot from these videos! 💎
Don’t get it twisted tho he’s doing it for money.
@@ryanthepianoman27 Doesnt remove the fact he is one of very few making educational electrician content, especially at this level.
Education eliminates ignorance! THANK YOU! I love the electric industry’s!
This channel should be an accredidated electrical course. Or set of courses. Self paced. Quality is top of the line, informative and broken down so anybody can understand it. Amazing channel, man.
Great info. I Love how you constantly refer to the codebook.
You could make one of those animated short videos just based on the different ways MLO can be fed. Lug to lug - Lug to breaker - Breaker to Lug- Breaker to breaker. I get this from a lot of students. Your animated shorts are the best tool to visualize something quickly.
This was right on time for me. I’m in the process of running lines out to a detached garage. I will be putting a MBR panel in for the wood shop. Thanks for the great content.
Maaaaan, this video is exactly the type of one most of us out in the field need to see. The code at the end helps contextualize disconnects and separate buildings/structures that we may be confused by out at the jobs where we don’t have all of the knowledge that we need.
Your are greatly appreciated for all your time and efforts you have given us,your demonstration and illustration are flawless.
I've learned so much stuff from your channel. Just wanted to say thank you
Always coming in with the best content on the internet and a better teacher then the ones I have on the field I love that you show me code so I’m able to look it up in my code book thanks man!!
Wow, the castle illustration was over the top. Amazing videos man
This was a good video, I like how he referenced the code book in the video it makes it easier for me to understand.
I am a commercial electrician for the TDSB. love your channel. A lot of what you say defiantly works for residential. But I would love to show you the world of OLD commercial. give me a message if your at all interested.
I’m currently a 1st year union apprentice, and I just wanted to say thanks for making all these videos! It really helps man! Keep rocking on!
Here's a video though based on this video. Explain the Bonding screw used in a MBR Vs a sub panel. And Why you separate the Neutrals and Grounds in the latter. Thanks!
Thanks for the Video. In my country we call them Plus Main and Lug Only
You should go over feed thru panels next
+
I'm glad you are still doing well bro.
I very much like your format!
Godspeed Dustin!
Just nice, desde Colombia, gracias
Thanks for the knowledge brother
Thanks for watching!
Great content as always!
Keep it coming! Great channel
Great information and codes.
Thank you.
P.s. happy thanksgiving day.
You the best thank you for what you do my respect
Sweet man. I'm an hvac tech. I appreciate the content. It would be cool in you could detail pringle switches some time.
Thank you for sharing your knowledge.
Thanks for watching!
As an electrical engineer, never heard of MBR even on other consultants plans. And at this point I’ve seen thousands of plans. Also, on panel/switchboard submittals, never seen MBR. I have however seen MCB.
I don't think he deals with alot of new construction especially commercial plans and submittals
Thanks, great video!!
Awesome man love your content
Awesome graphics.
wow congrats ElectU ive been watching your channel before the come up!
Good job! Keep it GOING
Great video.
Kind of off topic question, but related, what size wire is recommended to use to wire up a 125a sub panel thats approx 2 feet from the main panel? I measured the overall height of both panels and the distance between them and it came to a little more than 7feet total for estimated wire length per leg.
Thanks for sharing this video electrician
Great clip
Thx for the tour of your castle ... Lol ... Good vid ... Happy Thanksgiving ...
So when adding like you showed at the end with the house underground to other house or castles in this case lol when adding a main breaker panel instead of mlo we would have to unbond the panel and then float the neutrals and grounds. My question is have you ever had to drive ground rods in both locations( referring to both panels) ? I've always pulled a trailer wire rated in amperage to feed it unless it's in a house panel to panel then I would just pull a SER type wire. I've been told both that you do have to drive a ground rod and also you don't because there is a ground in both those types of wire I mentioned.
Great video bro 🙌🏻🙌🏻🛠🧰⚡️
U explain well
Turning a sub panel into a main braker panel how do you fix the neutral and ground separation? Here you don't have the green screw you just remove like in a original main braker panel!
Hello one question. Does the amperage capacity of the general switch depend on the capacity of the electrical panel conductors? If the electrical panel supports 200 amps, is that the maximum that the main switch should carry? I appreciate your response
I have a main lug panel . Can I add a double pole breaker to it and wire my hots though that breaker and use it for a disconnect?
Glad to see the beard is making a comeback
I'm not even close to being an electrician, but I love watching your channel (I subscribed and smashed that "Like" button). Is there a reason to not have a second disconnect at a MLO panel? I understand that there is one at the MBR panel, but would it be helpful to be able to shut off the entire panel when you are in the separate structure? I'm not trying to second-guess you or the NEC, and I know there is a reason for this, I'm just curious. Thank you.
This is why most times at a separate structure, there will be a disconnect that would de-energize the MLO panel, instead of having to go back to the MBR to disconnect power.
What about backfed main disconnect being screwed down? Wasn't mentioned
Nice!
Thanks!
Never heard of someone abbreviate main breaker before lol
Maybe it's different in other areas (I live in CA) but I've never heard it referred to as MBR. It's MLO and MCB (main circuit breaker)
MCB makes way more sense as an acronym
@@thepeter3116 rare occasions I've heard it called "MB" but never MBR. weird...
What does MLO stand for?
MCB to me. Means Molded Case Breaker. Which is something else entirely.
Usually breakers greater in size than 400A but that is not a hard and fast rule.
Basically it is a sync and switch gear breaker or main service disconnect for larger services than a typical residential system.
Doing data centers for 10 years now. So my acronyms are dramatically different than what most are familiar with.
They look like these : m.industrialautomation-products.com/sale-10772595-schneider-masterpact-molded-case-circuit-breakers-nw-mw-800-to-6300-a.html
I am wondering for residential, who is using Square D Qwik-Grip for incoming Romex? If not ,why not? If so, why?
Aren't you allowed to avoid adding a main breaker or disconnecting means at an out building panel if there are 6 or fewer switches to shut off power? I. E. A main lug panel with 5 breakers feeding 5 branch circuits could be used in lieu of a main breaker? Or am I mixing up something?
The main breaker is to cut off power to all circuits in the electrical box
@@cattiger76 obviously....
@willpartin622
3 hours ago
HELP! I'm replacing an old Federal Pacific 100-amp panel with a 200-amp Square D Hameline panel, so I will need to upgrade the service entrance cable and want to use 2/0 THHN copper.
The outdoor meter can/box is mounted low, (30" off the ground at bottom edge of can) outside, so if I use the bottom rear 2-inch knockout of the meter can, it will put the hole through the wall below the bottom edge of the new breaker panel by about 8 inches, so I will have to make a vertical 90 upwards turn from hole in wall to bottom knockout of the new panel. I cannot find a 2" close 90 PVC electrical fitting so I'm guessing they don't make one.
My question is: how do I make that vertical 90 turn upwards? It will eventually be covered in drywall. Do I need to have the inside copper leads in conduit at all? If I use switch to 4/0 aluminum, do I need conduit inside the wall cavity? thanks in advance!
Can you convert an Eaton BR (MLO) panel to a MB Panel?
A question for a Q&A video: 1950s house with no equipment ground on any sockets and no metal conduit/cladding. How do you go about adding equipment ground?
gfci upstream
@@xjackdareaperx It is a type of protection, which is better than none, but it's not an equipment ground. At minimum, for a ground, he needs to drive a ground stake to Code, and attach suitable gauge wire for the earthing from the pole to the box. Then run additional wire for ground - that's when you may end up rewiring circuits with newer romex that has the ground included.
A GFCI detects imbalanced drain from hot, that is going to something other than that circuit's neutral, but it is not a replacement for a ground. Combining neutrals - which happens in older wiring - can trip GFCI's. Several electronic power supplies on the same circuit, can also trip a GFCI. They leak a small amount of power to ground by design.
@@my_channel_44 Yes but in this situation noone's going to be rewiring or running new wires, a GFCI upstream would still provide protection, but as you said, technically it is a type of protection, one that is most commonly used in that situation. I have personally very seldom ran into issues with new gfcis tripping on older homes luckily but I can see it happening easily and requiring further action.
@@xjackdareaperx It's more that I want an equipment ground than protection. So far, it's either running new romex and letting it simply dangle in the walls without properly securing them (which would require opening walls) or running conduit, since that can be secured according to code (from my layman understanding).
@@gslavik just fish romex
I was at a small single family home today, built in 1974, no main breaker on old square D panel, and except for the sealed meter breaker, no exterior breaker either. The neighborhood is full of old identical houses, though I did not check any others. WTF?
I think the industry standards are MLO, MCB, and FU (fusible unit).
My electrician put a main shutoff coming into the building then a panel with an MBR.
Do they make panels with a main shutoff at top, without being a breaker? What are they called?
How much money you wanna spend? 😂
It's easier to go into a nema disconnect into the panel itself at that point.
@@ElectricianU I do multifamily units with a 100 amp breaker box inside, with a main breaker in the box. And that's wired to a meter pedestal with a breaker in it as well. Inspector is not liking having two 100 amp breakers in line. Inspector said on future buildings to not put a breaker inside and just a shutoff switch. But the breaker box sits in a 2x4 wall that's finished with drywall around. Putting a traditional disconnect next to the breaker box does not flush mount for drywall. You say put a disconnect inside the box? How? Thanks for your help and videos.
Castle Graphic is the BEST!
pleas make a video about DIN-Rail
Eh not to be the overly particular here but those QO panels are indeed load centers. Never heard of MBR but I take it your in a different region by referring to 4 squares as 1900 boxes. Noticed that in another video. Markets I've distributed in just refer to them as MB in SC, OK, and FL.
Get you some Eaton bro no one got time for that SQD stuff
I haven never heard anyone say MLO or MBR
Is that a slain dragon buried in the ground in your animation? Who is the skinny fella buried under the other structure?
My parent's current house (older & rented) does not have any main breaker in it whatsoever...the lines come in directly from the meter into two lugs on the breaker strip.
It was very disturbing to try to work on it while live at 150 amps...but it had to be done...so 2 pairs of nitrile gloves and an outer pair of rubberized work gloves were my only option.
Oh...and one of the outside breakers feed a secondary inside fuse (YES...screw in fuses) panel...one of those fuses feeds a tertiary fuse panel further on.
It's a fucking mess!
If they rent the house out to others, I'm not sure if that would pass a city inspection for renting it.
If they are the renters, the only things I would suggest are either have landlord fix wiring (very unlikely as it is a bare studs remodel at that point) or move.
Pull out the meter. Bam. Dead panel 👍⚡️
@@JasonW. They rent from a LL...but since the electrical has never been upgraded the LL doesn't have to add the main breaker.
@@liloso60
Pull out the meter. Bam. You get a tampering with a utility charge and fines.
My panel is some weird hybrid of both.
When your internet speed is below tens of kilobytes per second the naming convention of internet speed starts to make sense ... brah, this speed is KILLING me, yo this $h¡t BITES! Can't even stream.
Don't worry, temporary issue, out in the boonies, will be back in civilization soon enough.
I’m sorry did I just watch a vid with shit square d panels with neutrals at the top. Arrrrg
sometimes you just hafta go with what the build spec is!
Yuk.
Smd
Can a garage fed from the house have a higher breaker rating than the main panel?
In other words can I put a 60A breaker in MBR panel then feed a sub panel in another structure but then put a 200A main breaker on it?
No
@@DLmohh code reference please?
@@mehardeepsingh5190 Lol, hes one of the people who say something but they dont have a code reference to back their claim up.