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higher

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  1. N

    Guidance needed on moving sockets higher up

    Hi I moved to a new detached house which is ~90 yrs old. It has RCB switchboard outside (Kitchen, lights, smokealaram) but I am not sure when the house was re-wired last. My problem is that I need to lay a new floor. However the current sockets, sits just above the old skirting board which is...
  2. G

    Earth fault loop impedance

    How does earth fault loop impedance and disconnect time requirements change for 3phase 3 wire 230 volt systems where the phase to earth voltage is 133 volts instead of 230 volts?
  3. J

    d type breakers needing a low zs

    im a 1st year apprentice thats why im asking this question, from what ive gathered the higher the current it takes to trip as in 10 times the rated current etc... for that you need a lower zs than if it was a b type why is that? my thoughts on it is that becuase you have a higher current so...
  4. P

    Full Calculation of Perspective Fault Current - PFC

    I seem not to have access to the professional forums so I post this here: I understand ohm's law and to get a current you use Volts/Resistance (V/R); so if it's Perspective Fault Current (PFC), it's V/R or Volts/Ze; and we divided by 1000 to convert to kA. Yes? Is there a difference when...
  5. A

    Can towel radiator be upgraded just by switching element?

    A client has a Dimplex TRS120 oil-filled 120W electrical towel rail. The element has packed up and before it's replaced I wanted to check whether the 120W element could simply be replaced with a higher wattage one, e.g. 175W (TR8404), as listed in the Dimplex spares brochure, a couple of lines...
  6. R

    Ze result on a TN-S strangely higher than normal.

    Attended a 1st floor flat in a council block today and found a supply head inside a mantel cabinet where the earth was connected around the outside of a conduit housing the main supply cables before going into the cutout. Also coming out of the bottom of the cutout was another 6mm2 earth which...
  7. D

    RCDs raising zs values

    Was at a property toady which I've done previous work before including fuseboard change. All i did today was change a few socket plates over for new ones. Took some Zs readings and noticed they were very near the limit of being acceptable ie: 0.92, 0.98 etc. Took a Ze at the board with main...
  8. L

    ZS measured higher than zs calculation

    I was wondering if anyone can help me out with this conundrum. I was testing a domestic property and tested a security alarm which was a 6A MCB not supplied by any RCD. Ze was 0.12 Ohms R1+R2 was 0.10 Ohms Now using the calculation I assumed the reading would be no greater than 0.22 Ohms...
  9. J

    Will a reading higher than given in 7671 for Zs values be okay if protected by RCD

    I might be COMPLETELY wrong.... but I have recently finished my level 3 in college and I'm sure I was told that if a Zs value is higher than the max reading in BS7671 it's okay if it's protected by a 30mA RCD, so it passes. I sort of remember writing 'satisfactory' on the test form next to Zs...
  10. J

    Higher PV DC Output voltage

    Just been advised by a customer he had been told a higher DC output voltage (HJ Solar 250w) was better when shading was an issue. Is this correct ?
  11. W

    Caravan Earthing, Higher impedance?

    So I have a static caravan that has a hookup to the house, And I wanted to improve the earthing by installing one specifically just for the caravan, So I have driven in around 4ft of copper pipe and used 30a capble to earth both the chassis of the caravan and the metal exterior, but upon...
  12. J

    Rcd x5 higher than x1 reading

    Hi all, just filling out some paperwork from an inspection a couple of weeks ago and just noticed that a x5 reading is 76.4 and x1 is 28.4-not sure if I've misplaced a decimal point or what.. Going to go back and recheck it tomorrow- how can x5 be higher?
  13. P

    Higher current RCD required?

    Hi, I am upgrading one of the electric showers in my house from 8.5kW to 10.8kW and I want to check weather a higher rated RCD should be installed. I currently have 2x 8.5kW showers, both connected with 10mm^2 cable and 40A MCB's and a single 80A/30mA Contactum RCD (B8003/2) in my Contactum...
  14. M

    Continuity of ring final circuit..... can somebody help please !!!!

    Im currently studying electrical and im up to dead tests. ive reached continuity of ring final circuit on my scenario cd , in therory i understand the procedure and what to do but im a little un sure on finding the mid point on the sockets . please can sombody go threw it step by step in...
  15. whinmoor

    British Gas owner Centrica warns of higher energy bills

    Although obviously bad news for 99% of people, this may be helpful for the solar industry as people might consider how to deal with rising energy bills: BBC News - British Gas owner Centrica warns of higher energy bills
  16. D

    higher Zs with RCD

    When testing Zs for circuits which also have RCD protection, what figure do you record onto your test sheets? when you exceed the max value for a specific MCB, due to the rcd. Do you just use a calculated value or do you actually record the value that you get even though it exceeds the max...
  17. S

    Inverter reading higher kwh than meter ???

    Our inverter is reading about 6% higher than the PV meter. It shows we've generated 311kwh since installed whereas the meter only reads 290. Is this normal ? Im guessing it's probably due to cable/efficiency losses.
  18. F

    RFC - end to end on CPC higher than expected ( EICR code advice please )

    In the process of a domestic EICR. RFC, i'm getting L-L (0.11) N-N (0.11) cpc-cpc (0.48) had to take off all socket fronts anyway as i did not like what i saw on a couple of random selected s/o & i've tightend up any loose cpc terminals i can find. I'm guessing that there could be a JB with a...
  19. S

    Customers **** me off

    Quoted a job and while back but customer didn't have funds available. ( customer is known to us through my engineers mum) Told the guy that I would requote when he was ready etc and chased up for the deadline EPC coming in. Anyway, it worked, money came in for him, bit of negotiating, email...
  20. S

    3rd march confirmed for higher fit rate

    source businessgreen confirmed 4-0 descision

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