CHEAPEST RCBO EVER! £2.50 | Tomzn RCBO Tear down скачать в хорошем качестве

CHEAPEST RCBO EVER! £2.50 | Tomzn RCBO Tear down

This video features a too good to be true price on a Tomzn Electrical RCBO from AliExpress, costing only £2.50 (about $3.30 or €2.80) I was fully expecting to make this video as a warning about counterfeit switchgear (which absolutely does exist, only buy breakers from reputable suppliers) however to my shock it was actually real. For reasons, I will elaborate on momentarily under no circumstance would I fit or use one of these breakers myself. Perhaps I should have mentioned in the video that I am an electrician, so I know what I’m doing, under absolutely no circumstance should anyone who is not properly trained be working on or inside a consumer unit, fuse box, breaker panel or any other power distribution equipment. Remember any mistake can be your last when dealing with electricity, its best left to the professionals. With that out of the way I was pleasantly surprised by this RCBO, it was genuine and did pass my function tests with flying colours. However, a few things immediately stood out to me as weird, for one I was not aware type AC RCBOs existed, I would never fit a type AC RCD any more, and would usually advise clients to remove them and replace them with type A ones, which are not much more expensive. Type AC RCDs or RCBOs will be blinded by DC leakage making them much less sensitive, possibly stopping them from operating in the event of a fault. Another abnormality is that the maximum breaking current was only 4000 amps, normally the minimum is 6000a and I prefer 10000 amp rated ones. When I took it apart the internals also all looked decent, and I assume it would have a functional overcurrent side to, although I don’t have the equipment to verify this. One minor thing I did notice is that there was a mix of welded and soldered joints inside the breaker, particular those which are carrying high current. This is not good because if something goes wrong, like a loose connection or a bad contact from pitting or something heat will quickly travel to those joints (as good electrical conductors are generally good thermal conductors to) which could melt them, causing a messy break, arcing or in the worst case an internal short in the breaker if it sprung off and hit another uninsulated conductor. This would be relying on the upstream protective device to trip off, usually a 100a BS88 service head fuse. From experience, I can tell you they are not easy to blow and will go with a huge bang. You could be risking an arc flash or other catastrophic failure. Not to mention a blown service fuse is not something an electrician can fix, that will require a visit from a DNO network technician which will be VERY expensive if they decide your substandard equipment damaged their network. They may even terminate your supply, meaning you would no longer be able to have electricity in that building if they think your installation risks damage to another customers or their equipment or harm to personnel. I decided to do some more testing on the materials used in its construction. I did the flame test on the braid used to carry the load current inside the breaker to see if it was copper or aluminium. I use this as a quick check to tell if something is CCA (Copper Coated Aluminium) or pure copper, when heated in a flame copper goes black, but aluminium will shrivel up and go brittle. The braid was actually copper according to that test. Next I used a magnetic screwdriver to see if any bus bars were not copper and did find some copper coloured magnetic ones. Upon scratching them you can see a silver metal under the copper which I assume is steel. I also did a flame test on the plastic the case would extinguish itself within 10 seconds or so however it should ideally be not flammable at all. It did melt however I have seen other breakers from reputable suppliers also melt after getting hot so that in itself is not different to some real breakers. But some of the plastic, specifically the coloured stuff was very flammable and did not self extinguish which is not good. Overall would I use these? No. Absolutely not, and I would not recommend anyone else use them either. If you are a DIYer and need breakers for a project I would first encourage you to call an electrician and not do it yourself, but if you must at least buy the parts from a proper supplier like screwfix, toolstation or a supplier like TLC, CEF etc. Most of them allow you to place orders without an account online however do not be surprised if a trade counter refuse to serve you in person, especially if you clearly don’t know what you are doing. They often have a very low tolerance for “Oh I need the white thing, you know that box with the button in the front”. Thank-you very much for watching, drop any comments questions or suggestions below, and I will do my best to help. See you in the next one! Tags: #rcbo #electrician #rcd #fake #alixpress #tomzn #teardown #test #safty #fusebox