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  1. L

    Type B MCB tripping at higher current rate than cable capacity

    Can someone please explain me how type B MCB can protect a cable if it only trips when current is 3-5 times maximum load? Let's say, 2.5mm radial circuit is protected by 16A type B MCB. Prysmian 2.5mm T&E current rating is 27A. How will 16A MCB protect the cable from overheating and burning if...
    • Luka
    • Thread
    • cable capacity current higher mcb tripping type type b
    • Replies: 9
    • Forum: UK Electrical Forum
  2. T

    UK Higher than expected Zs

    Hi, I did my first EICR on a TT system today and the Zs was a lot higher than Ze+R1+R2 on everything. Zs was around 3.5 ohms on all of the ring circuits and the oven circuit and lighting circuits were between 3-4.5 ohms. The Ze was 1.1 ohms and R1+R2 was between 0.9-0.23 ohms at the various...
  3. J

    How to best run cables between lower soffit and higher soffit?

    Hi folks, I have been out to quote for a soffit lighting job. I have done jobs like this many times but usually only installing lights in the top soffit and has always been easy enough to get cables into the loft. This customer would also like lights in her lower soffit. I have a few ideas on...
  4. AlmondSauce

    60W (or higher) USB wall socket?

    Looking to fit a USB-C PD wall socket for charging / using a laptop - so I was hoping to find one that supported 90W or higher charging, though 60W would also be tolerable. Looks like the most powerful one I can find though is this, which tops out at 45W Knightsbridge NETUSBPDWH White 50x50mm...
  5. L

    discharge higher than 3kw with ac coupled 3 phase

    hi guys i'm trying to get my head round the following setup growatt TL3 5kW 3 phase string inverter 14 panels @ 395W Spa3000 TL ac coupled controller - unless there is a alternative mcs approved one available growatt ark 4x2.5's with bms will i be able to draw 3 5 or 8kw with this setup please...
  6. opyate

    Friedland 752 transformer giving higher than expected reading

    Hello, We moved into an old house (Wimpy 1957) and the doorbell doesn't work. I read the AC voltage on the old Friedland 752 transformer, and it's at 13V, not 3 or 5 or 8 as per the options. The solenoid on the bell might be getting too much power. Why might it read 13V? This person also...
  7. S

    Solar How do I limit or feed inrush current for higher constant current use?

    How do I limit or feed inrush current for higher constant current use? If I could find solution, then the chosen battery cell type can have much lower Discharge/Charge rate. My product research found that lower Discharge/Charge rate cells are much lower price. So you can purchase more storage...
  8. barisk

    Higher amps in my garage

    Hi , I’ve just bought a welder i will attach specifications and i has a round pin power adapter, how can i use that in my garage with a regular house socket . I also found a convertor from 13a to 16a , not sure if that’s the way to do it . Many thanks
  9. Highspark24/7

    Rcbo with higher than permitted zs

    Hi I was testing a large holiday let property which has a three phase supply and dB Now the original install was in 2012 and electrically is well done but poorly designs on socket circuits all rcbo are type c and only on socket circuits I am over the max permitted zs I would recommend change...
  10. Dartlec

    Higher rn than r1

    Where is the point at which a higher (but continuous) conductor reading should be considered 'OK' on an EICR? I know the theory is that it should be between 0.05 ohms, but when it falls outside that, how do others decide when it becomes an issue that must be resolved? Checking a small flat...
  11. B

    Moving the drop higher on mast

    A tree limb has grown in diameter and is rubbing against the line that comes in from the pole. As you can see in the photo I could move the clamp on my mast higher. This would free the line from contact with the tree. Is there any reason I shouldn't do this? (The limb in question is 20 feet...
  12. S

    New Zealand Fuses replaced with higher amperage. Thoughts?

    Background: House was built early 1980s, fuse board is mostly the old school ceramic fuses. The wiring is said to be of modern design with 'tough plastic sheathing' according to a pre-purchase inspection. The previous owner has replaced a 5 amp fuse for the lights with an 8 amp circuit...
  13. M

    TN-C-S with Ze higher than 0.35 ohms

    Hello! Where do I start to troubleshooting with issue of higher reading of Ze 0.45ohms with TN-C-S earthing arrangement. Thank you!
  14. A

    High voltage plug sockets

    Recently changed plug sockets and light switches. Have noticed before this was done we were burning through light bulbs. A few of our plug sockets are high voltage 250 -270. Any ideas
  15. The Mains Man

    RCCB making the Zs higher than it should be

    after finding an unexpectedly high Zs on a shower, I narrowed it down to: Zs at input of RCD (RCCB) is around 0.18 as would be expected but the Zs at the output of the RCD is 0.96! Both tests done with 3 lead low test on Megger MFT with 3 month calibration. It is a split load board and both...
  16. O

    18th Edition & OSG - higher or lower - a bit of fun!

    So we all have to start parting with our hard earned monies CEF have just emailed me an offer of £94.95 (they say no VAT) Which is the cheapest I've seen so far .......... Anybody seen a lower price (or higher) :):):):) EDIT: The bundle isn't for both IET books the OSG guide is the NICEIC...
  17. B

    High ze readings. Even higher zs?

    testing a TNS installation today, found a high incoming ze of 1.14ohms, in my head putbthis down to incoming earth issue as all terminations tight, but when I test any subsequent circuit I’m getting much greater zs readings approx 4.0 ohms. I was expecting high earth loops as my incomer was high...
  18. K

    Higher Education (HNC/HND)

    Hi All, new to the forum. My names Kris, I'm 29 years old and i'm a fully qualified Electrician, including City & Guilds Level 4 Design & Verification. I really want to further my knowledge and after some research the only route left, I can see that is left to take whilst working at the same...
  19. L

    Nest Pro Installer

    Morning everyone, just wondering if anyone has any experience with being a Nest Pro Installer and what is involved in getting set up and if it was worthwhile, many thanks.
  20. B

    Tungar battery charger

    Saw this on ebay VINTAGE BATTERY CHARGER | eBay - http://www.ebay.co.uk/itm/142209979231?_trksid=p2055119.m1438.l2649&ssPageName=STRK%3AMEBIDX%3AIT Did a bit of research on the net seems it has a mercury rectifier in it. Built in the 1920s. Anyone remember seeing one before? only thing I...
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