One of the features of the Kewtech multifunction testers, which is not helpful, in the way you wanted to test, is the built-in averaging of loop preceding tests. If you leave it set to loop setting, every time you press the test button, it performs the test, and displays the average over all the preceding tests. To get individual readings, you have to deselect and reselect the test, and then press the button. So what you actually got was a reading for L1, then the average of L1 + L2, and then the average of L1 + L2 + L3. I was not aware that the continuity null of the leads, could be used on subsequent loop tests. I will have to try that out.
Is the lead nulling done on continuity transferred over to the loop function? I have just read some of the manual and it doesn't say anything about that, it just says the test lead can be selected between a mains lead and distribution board leads. That is pretty exceptional if they have built it to do that. Looking at the accuracy specification on high loop PE measurement it is specifying 3% + 25 mOhm, so that last digit is potentially meaningless.
I would have gone tri rated double insulated, the swa’s will be a pain in the ass, all the recent 185/240’s I have bought have been stiff as not like older cable.
Personally ide installed tri rated double insulated four or three core cables , run separate cpc far easier to pull and bend ect …no need for swa it’s out of reach and highly unlikely to be damaged, lid ladder rack if needed 😮😊😊😊😊😊. Swa is not required. Hardly use it anywhere apart from back in the dark ages Uk .😂😂😂😂 remove panel under main switch get zdb I bet it’s lower 👍
I wish we could, but they want SWA for the incoming, i would argue it’s more at risk than your typical installation due to the nature of the place (I can’t talk about what they do) but they laid out a bullet proof spec for us regardless. It will be hard work but more than do able with a bit of graft. I would love to get a ZE of the incomer but we needed to do it safely, we are connecting onto that specific breaker so that worked great in this situation and we could do it without any spicy works 👍🏼
Do you find EOM worth it? I manually the cable calcs fine, but I’m interested in it for drawing site distribution if it’s better than normal CAD software for that?
I personally think so, the drawings are built based on the circuits you build beforehand, you can then customise them to your liking. There is a whole reports builder which you can tailor for each project, it has all the schedules, calculations, cable/circuit, compliance certificates and so much more, you can customise it all with your branding too 👍🏼
@@residualelectrical Sounds ideal! Given me something to think about.. unfortunately I think I’d have to go for the “professional” tier due to the size of some of the site I work on but there we go. At least I could sell them some updated drawings! Most are on pen and paper ahaha
Great presentation. A couple of things to consider. If supply is from a public network, the Ze can change due to network changes. If quite close to the transformer, the Ze could be really low and generally, MFT accuracy isn't, so a low reading could have quite variation from the actual value. Accuracy not to be to be confused with resolution.
Thanks! Yeah I agree, I should’ve mentioned that the high resolution mode does increase the test current also for a more accurate result and can obtain pfc’s up to 50ka. Obviously it’s not going to keep up against a 1000a network impedance tester but it’s better that the tiny test currents most MFT’s kick out.
Great project. I am currently assembling a Schneider electrical switchgear for 1250A. This is PrismaSetP. Very cool project, I have to make many of the current rails myself. Greetings from Poland.
Cool to see the calculation program, the one I’m using isn’t that detailed. Running 240 in anything other than underground conduits is a pain. Did calculations for 800A supplies many years ago and ended up running 4x120 to make it workable on the trays and going into the breaker. Fortunately I didn’t have to run those myself but I had to run a 2x120 for a microwave oven a few years after that, the pure joy of being self employed
How can 100 ohms be ok, that’s literally 0 protection if you have a short only 2/3 amps will flow and anything not on rcd won’t trip, in Ireland it would have to be below 1 ohm max I’m confused
I don't know whether there's anything official on it and not an electrician, but wouldn't it be better/easier/safer to install the panels from the bottom upwards instead of top down, especially when wearing PPE and balancing screws on drivers so if it falls it's more likely to end up on the floor instead of in the board.
There is a little gap at the bottom of the last panel, so if that goes on first and you drop a screw it ends up under there you need to remove the panel again, that’s was my thinking anyways it doesn’t really matter 👍🏼
Data is cool!!!!! Those increases to closer to 1 power factor are probably heaters. Motors and capacitors will both lower power factor unless of course you have them balanced and cancel out. But seeing the times and increase in demand too, probably water heaters. That board with the horrendous PF, that was the board with all the LED lights correct? Cheap, no PF correcting LEDs will have the worst PF of any device. I doubt any single inverter is doing all that, but easy enough to turn off devices and watch the PF to find out. And I know some places have more lights on inside during the day, underground than at night. And kudos to wearing leathers over the rubber gloves. So many fckuers wear the rubbers without protectors and without the leathers, it just ruins and almost makes the gloves useless. Even class 3, 30kV gloves, I see so many wearing without the leather protectors not realizing one strand of wire will go right through the rubber gloves. Anyway, rant off. Happy to see the leather protectors and all those numbers from power loggers! Stay safe!
Logging the solar generation directly would have helped to confirm if it was generating at near perfect 1.0 PF and thus the inverter itself ok. When the load and generation are closely matched, the PF values can vary wildly as it swings in the balance between import and export. The overnight load PF looked generally ok, so it's probably not an issue with the base loads themselves.
Yeah for sure, we was only asked to get KWH across a week but seeing how the PF was after a week I wish I logged the solar and the mains separately too!
Generally yes, never open circuit an energized CT. But I believe those were Rogowski coils and those are safe to disconnect while the primary is still connected. Plus a lot of power logging devices will ether use the Rogowski coils for ease of installation or if actual CTs they will have internal resistors or MOVs to limit open circuit voltage. But your everyday CT, correct, never open circuit the secondary when primary is still energized.
Leather protectors to protect the insulating rubber from damage. You are required to wear them over any rubber insulating gloves, although way too many people just wear the rubber insulating gloves and no protectors thinking that's ok. Until a strand of wire pokes through the rubber and lights you up.
I thought that was the reason. Many thanks. Take a look at the Shelly products. Amazing way to track usage etc for small commercial/industrial/domestic for a budget solution which is cost effective.
@@brianoneill350 I actually have a bunch of Sonoff / Wemos devices flashed with Tasmota I use to monitor building loads and tempuratures. I converted the Sonoffs to use CTs instead of passing all the current through the unit itself. Then have an AWS server running an MQTT broker, Node-Red, InfluxDB and Grafana to log and make all the screens. There are other ways too, like Home Assistant, but last I checked you had to run a local server for Home Assistant and I have devices spread out across my area, so using a remote server was better. I also set this up 5 year ago and for sure things have changed, but this still works for what I need.
Was talking to an ex electrical linesman who worked in Victoria, Australia. He said that in the past, the power authority had a lot problems with electricians wiring dairy farms with ALL the load on a single phase, at a number of farms. This was pulling one of the phases down in that area, with very unequal loading. Electricians refused to believe that they were doing it wrong. To be fair, in rural Australia most properties were single phase, single line and electricity was a new thing.
Great videos, really interesting! How does the metering work there, I thought when there is a BNO like this appears to be with the Ryefield board, that is all pre-meter, then the individual flats and the LL supply all have their own meters, is that right? If so, I wonder if the LL is being billed for the EV use on their meter, is billing the users, but isn't taking that out of the service charge calculations so is getting double bubble on it
Yeah I’m suspicious of the EV billing also, I believed there is an upfront meter and then all the flats are metered, so LL should be total - tenants if that makes sense 👍🏼
@@residualelectrical Ok, in that case could the tenants be being measured in kWh on their meters, but the primary meter is being billed in kVA, so that is then getting hit with all the power factor issues that would not be billed to the individual tenants? Or maybe a tenant has bypassed their meter somewhere if they are in their individual units!
@@residualelectrical I manage a very small commercial building, and one of the intakes has a 100A 3-phase head, and off that, there is a three phase meter for one tenant, the two separate single phase meters for two others, one of them needs a meter swap which will take them all offline, and when speaking to UKPN they suggested I may want to re-jig it so I become a BNO so the that the intake goes into a Ryefield board I manage, and then the individual meters come off that, but with no metering between the service head and the new Ryefield board, this is only a 100A supply, so maybe when it is 400A or whatever you have there it's different (I am not an electrician!)
Nice electrical sleuthing. Unfortunately now the way to progress is to look at the total incoming supply and establish what the pf there is or you are getting into more sophisticated wave for monitoring on that board, but that still isn't going to tell you what is happening at the incoming supply.
Love your channel mate can’t wait to see you doing well! I’m coming out my time early next year and going self employed via agency and gonna try to slowly build up my own work. I’m based up north but if I can help in anyway mate let me know I have no issue travelling. All the best pal 👍
