Replacing 110V step down transformers
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- เผยแพร่เมื่อ 6 ก.พ. 2025
- In this video we are replacing several failed 110V center tapped wall transformers, expect to see some 110v sockets, transformer theory and some real world live testing.
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The works carried out in the video and the opinions shared are my own, and not representative of the associates and companies in the video.
This content is purely for entertainment purposes and is in no way a "how to", tutorial or educational video.
Please consult an electrician when dealing with any electrical installations.
#electricianlife #electrical #electricalengineering
This is easily one of the dirtiest jobs on youtube minus all the sewage stuff, quicker to get you killed too. I respect everything you do man, it pure raw talent you have here that makes you a living.
Hah, just had another thought though, sparkies regularly must deal with the sh--ty end of the sewage stick inadvertently, sometimes unavoidable!
Can you do a short video about why you have 110v systems? Me as a central european can't really figure it out :D
Smashed it out the park bro!!!! 🎉
Your explanation was spot on 👍🏼.
In a 110V CTE system, instead of the neutral lead, the centre tap is connected to the supply earth. This system has no neutral, therefore caution must be taken to ensure that no live lead is earthed. Short-circuit may occur and may lead to system power failure. Also, the centre tap of the transformer should be left unconnected when is it not in use in an unearth system.
CTE system is commonly used for site safety portable tools. The centre tap splits the winding into 2 sides with each having only 55V with respect to earth. In case of an electric shock, this limits the magnitude of the shock potential to 55V, half of 110V. Although 55V can still be a fatal shock under certain circumstances, it is better than a full 100V. CTE system for portable tools are usually installed with residual-current device (RCD) for safety reasons.
Mikey.. again.. hands down.. best spark on TH-cam . From one Aussie spark to another .. love your videos.. love your work.. love your knowledge .. your a beast my friend .. ur knowledge and explanations are just next level for your age .. appreciate you bro 👍
I agree, he is easily the second best spark on TH-cam 😍
Is it a trick of the video or is the level on one of the RCBOs damaged? it seems to be sitting at an odd angle.
6:53 you could use piggyback spade connectors for looping through
Mike, your channel is BY FAR,my favourite YT channel,best electrical content on here, can't stand boring domestic shit, keep up the awesome content,work safe mate, cheers from Australia 🇦🇺🔌⚡🎆
Mate your vids are hands down the best on TH-cam. As a domestic electrician in the process of switching to industrial/commercial work I must say I appreciate your vids a lot 👍
Being a sparkie inspector myself and this guy is one great sparkie
Nice to see someone who can test properly in the realistic world 👏🏼
Well done getting that DB lid off without poping off any rcbos 😂
You pretty much nailed the transformer explanation, nicely done.
Enjoying the content mate, to enjoy fair this is the only sort of stuff I’ve done commercially it’s usually reactive maintenance and few and far between but enjoy seeing you back mate.
As I’ve mentioned before I’ve got the KT64 and my favourite feature on it is the RCD times all on one screen, having to scroll on my Megger is a pain. Keep up the good work pal 🤜🏻
Highly professional, great to learn the industrial side of stuff from your videos
Great content RC. Your description of the transformer is pretty much spot on with the output voltage set by the ratio of the number of turns of the primary to the secondary windings. Your comments on the 110V CTE system are interesting, I was always told that there was no recorded fatality from a shock from that type of system, which is why the HSE pushed it so much for construction sites.
This is exactly why north american/japan residential wall sockets were kept that way, protecting the average joe from the dangers of electricity, the more fatal voltages that allow larger wattages to get to your heart are in places the average joe should simply not be messing around. And yes, my father almost electrocuted himself in my childhood for plugging in a 240V split-phase clothes dryer rather carelessly with his hands with the bathtub adjacent to him.
Both of his fingers contacted each leg grasping the plug, wtf.
Great video, good technical knowledge making it easy for people to understand.
Absolutely class content!!! Keep this kind of videos coming! Very interesting and it will benefit alot of people!!!
Love that trick with the locknut/plugs.
Great video Mike. Just a heads up that you can get piggy back crimps to allow for another connection from the live pin. Quick and easy and makes a proper job. Hope it helps
Another great quality vid, Mike. Can't beat working industrial & commercial. Domestic can get a little boring from time to time. I've dropped you a "Like". Keep up the good work and content. Love from another Electrician in Wolverhampton 👍
Another great vid. Out of interest did you carry out IR or was that a limitation?
doing a great job ,nice to work with you ;
Great job guys , would love to work with you guys in the Uk, I'm currently working in the PV solar industry in South Africa. I'm really eager to learn the Job behind youbguys
55V is also below most voltage standards for a safe operating voltage at least in the US I believe it's somewhere around 70-80v and thus would be considered low voltage or some other variation of that.
Yep the ground is Center tapped.
In the US we do the same thing with our line transformers we will center tap neutral and have two hearts at 120V out of phase from each other and combined will give 240V. That is until you get into the industrial stuff.
Although I did run across a white paper that suggested using a center tapped 55v/120V transformer for noise isolation on stages in the US. I only just now thought of the safety implications this would also have.
Nice, just sat down on the bog and video popped up
What size breakers were those Tx's on?
Perhaps the Tx ratio/ principle you were alluding to was: Np/Ns = Vp/Vs = Is/Ip
Loving these videos Mike!
Great stuff again, always really insightful! Maybe worth a recap on Appx 14, BS7671:2018, para 4, 5 & 6 for the live tests. Correct me if I'm wrong but you took PEFC (line to Earth) for the Ipf. Should it not be PSCC x 1.73 or PSCC x 2 (line to neutral, highest of either calcs) for the Ipf on 3-phase? I've only just done my 2391 though and have seriously limited experience in the field compared to you, so let me know if I've missed the boat! Keep up the great work Mike.
@@residualelectrical For single phase, I agree it's the highest recorded between PEFC and PSCC. For three phase though, it seems to be just the line and neutral conductors used (PSCC).
I'll be really interested to know your take on it after digesting p554 of the brown book. I'm off to find a life now 😂👍
@@garethbaker5477 Yep, that's my take on it too as per Appx 14 in the regs. In the content, PEFC is used for Ipf/PFC on the 3-phase board, which is why I raised it. This very same thing caught out a time served NICEIC QS at the training centre I use!
@@residualelectrical Mike, chuffed I could help you for a change! My head was mashed on this for weeks due to being taught from an NICEIC QS on a testing refresher course who was referring to the 17th and the subsequent 2391 material that was corrected to the 18th mid-course for EFLI!
Ended up asserting things with the ex-AM2 assessor teaching the 2391 and Dave at Learn Electrics vids to arrive at Appx.4 for the correct detail. Strangely, can't find anything in GN3 on this.
You are correct mate! Actually brought this up with two gentleman from IET/Jpel64 and they confirmed that PEFC isn’t to be doubled when calculating PFC on three phase
I run a 220 volt isolation transformer rated for 50 amps at 220 and has a output 220 center tap rated at 50 amps 220 or two 110 ots rated at 25 amps it weights in at 300 pounds(US) since filled with epoxy sand to power my electronics work branch.
Awesome video as per usual Mikey!
Why do they have a bunch of small transformers at each socket location instead of one large transformer in the corner/closet feeding all of these sockets? To save copper?
It can be an option, it depends on what size the larger transformer would need to be to cover all the sockets and if there was a suitable location for it. The other advantage to using multiple small transformers is to maintain availability of a 110V supply. These systems and the tools are renowned for harsh working environments and routinely damaged. With the layout they have, they could lose a circuit but still have 110V available for use in another area of the shop, with a centralised system, tripping it means they lose everything and cannot work at all. Even with Mikey replacing the sockets, he was able to work on one circuit at a time, allowing them shop to still carry on working.
Working behind/ around every bodies tools is never easy.. kinda gets to me sometimes when you’re scheduled for months ahead of the time with them knowing what and where exactly you’re going to be working yet they don’t even think about moving shit out of the way and watch you struggle to squeeze behind all the shit and bitch when you accidentally knock something out of its place... I always charge 1.5x my rate when that happens.. always... and if they ask why the quote is not matching I show them the contract where it says I am not responsible for the relocation of materials in order to get to prediscussed locations to access the equipment, not including access in route to or from said equipment. Rates are added in half of sum on top if deemed necessary when the work has furniture or sizable objects relocated and returned while completing task and when tasks are completed.
Lol.
Can you recommend a decent 110v up rated external socket? Not on the tools anymore but all my stuff is 110 so wanna stick an external socket, will only be live when tranny on inside but want save leads through windows / doors. I'm 10% through slowly redoing my house so worth the effort for now.
IP rated not up rated
Bering from the mainland Europe I’m wondering why the need for 110 volt?
I came off my dinner early one day and saw a site transformer smoking pulled the plug out and one of the pins was melted off ,heater had been on for hours health and safety didn’t seem that fussed lol
Nice one mate, writing from Cape Town 🇿🇦
another amazing video!
Why would they use 110v instead of 230v?
Shouldn't all site tool supplies be 230 RCD protected if you can still die from 55v under certain conditions?
@@residualelectrical rcds do need periodic test but so does all equipment and tools if not PAT then it's user checks. Make users press button on RCD every morning and jobs done.☺️
What's the reason to run 110vac on site?
Safety, there is more chance of accidental damage or misuse of equipment on sites. The centre tapping further reduces the risk of injury as you will only get hit with 55V..
@@residualelectrical thanks, not used to it. In the Netherlands it's all 230vac onsite. Only in confined spaces you have a restriction on corded tools (50vac) but nowadays its almost all battery powered.
Why are these tools even 110v instead of normal 230? Is it purely because it's a lower voltage?
Nice vid
Most 110v transformers are rated for intermittent use only!
My guy
bro i never seen you work something just explaining things did you know thats boring
Almost anyone can make a video taking something apart / working. It takes skill to know what it is you’re doing and make a video of it. He smashed it here mate for people wanting to learn