value | Page 3

value

Recent contents View information Top users
  1. A

    Ze/Zs of 3 phase supply

    Hey all, going over some testing before my final assesment. i've heard a couple of times when testing a 3 phase supply using a single phase to earth test you double the reading as your Ze/Zs, so if you test L1-E=0.07 Zs=0.14. also what i have done until now is test all three Lines to earth and...
  2. G

    mixer value on underfloor heating?

    HI all, installed a s plan, well i say s plan, heating up stairs and underfloor down, there is a 3 way manifold for the underfloor heating, a couple of question regarding that pls 1 actuator came , but there is a value i open with that stat so i assume i dont need the actuator ?? also i...
  3. A

    On site guide amended zs value sheet.

    Hi guys, just wondering if anyone can help. I was wondering if anyone has a link to the new on site guide zs values as I have misplaced my sheet and can't seem to find the post that was on here and can't find it on the iet website any more. Cheers. all the best ape
  4. M

    Help me to Understand to get value of R1+R2

    This problem solving was on Virtual Scenarios (Ring Final Circuit) Getting Value of R1+R2 2.5mm and 1.5mm size cable used. 1st From the C.U. values of following connection L to L =0.27 N to N =0.27 CPC to CPC =0.45 2nd from the C.U cross the outgoing L to the incoming N and vice versa Measure...
  5. P

    Fuses blowing at twice the rated value

    I have a feeling I may be horribly confused and need someone to set me straight... As stated a fuse will blow at twice the rated value so a 5A fuse could potentially blow at 10A. However when using a fuse as a means of protection, you obviously want the fuse to blow to in order to prevent...
  6. S

    Checking loop tester readings from a sample socket.

    After calibration of my loop tester,I am considering using a socket in the house for future calibration checks and to connect various low resistances in series with earth via a rotary switch to give a range of readings,and if so what value of resistors?Thanks for any advice...
  7. Worcester

    Voltage Optimisation - The true value for homeowners ?

    Just got this in an email today, kind of sums it up really !
  8. G

    2394-5

    Q, The earth fault loop impendence measured for a circuit is L1.1 0.61 determine showing all calculations weather it complies with Bs7671 what do I need to do
  9. A

    Max permissible ZS for rcbo 61009

    So, when I did my 2391 I&t course I was told to use to values in table 41.3 of the regs for max ZS value for rcbo which provide earth fault, and over load protection. Recently a colleague of mine said you should use the value in table 41.5 which states a max permissible ZS of 1667 ohms. I don't...
  10. E

    Twin and earth testing

    Hi, A quick question, maybe a stupid one .... but it baffles me ,and I cannot find any info on the net. If you do the continuity test on a lighting circuit to get your resistance values, wired in twin and earth, how do you the the value for the earth ? Obviously you link the earth and phase or...
  11. F

    rcd tripping times

    just a quick one doing some rcd tests today, and at x1 value the tripping time was 46mseconds and at x5 29mseconds now i no that as long as at x5 value is under 40mseconds all is ok just thought the x1 value was a bit high so my question is there a max value for times 1 as i must admit not had...
  12. S

    Expected r1 r2 value when circuit 16.5m long

    Hi Guys stuck: A ring final circuit wired in 2.5/1.5 Resis: per m 7.41 and 12.1 what is the expected value of (r2+R2) the circuit is 16.5m long
  13. D

    high pfc domestic property

    hi, fitted new consumer in a domestic house. testing. ze 0.16 zs at origin 0.04 pfc 6.2ka the pfc is my problem, ohms law would make the pfc work out around 5.7Ka (using 0.04 as your resistance) (with all paths in place) using megger 1553 two lead test, high current, pefc and pscc are the...
  14. NDG Elecs

    Wandering PSCC value. Is my meter goosed....

    Hi folks, Just a quickie.. Testing PFC earlier today, specifically PSCC... Got a reading of 3.4kA, then did a double check straight away and got 2.1....ooh I thought so tried again and again with values ranging between the two figures above. Never had such a deviation in quick succession with...
  15. driverman

    60947 Zs VALUE S

    Guys. how do I find the Zs value for a 80A 60947-2 10Ka MCB? At this point in time I don't know the make. Is this a new number for MCB's? Does it make a difference with different manufactures? Cheers
  16. S

    How to work out average earth electrode value

    Hi guys, im doing revision for 2394 and got a question on getting the average ohms value for an earth electrode test. the readings obtained were 179,181 and 185ohms and they asked for the average. i have checked GN3 but it ain't clear. can anyone give me a method of how to work this out. cheers.
  17. L

    2394 question

    Hi I am due to start the city and guilds 2394 course next month. I thought that I would have a look at some past questions to see what to expect. I am having trouble with one of the questions and was wondering if anyone could explain the theory to me. 16) The measured value of loop...
  18. A

    RCD tripping times at 1x and 5x

    I understand that when carrying out RCD testing an RCD should trip within 300ms at 1x and 40ms at 5x but is it common that on occasions for the RCD to trip quicker at 1x than 5x. I never had it occur personally. I am just looking at some old certs and on some circuits the RCD is tripping...
  19. T

    Can you work out the value of the resistor?

    Hi guys, Just wondering if you can help me on this one, I have a RLC series circuit the values are as below; R = unknown L = 800mH C = 300uF from there I have calculated; the resonant frequency to be 10.3Hz the capacitive reactance 51.50 ohms The reason I need to know is I need to work...
  20. P

    Earth Fault Loop Impedance

    Hi all, I am hoping someone can clarify if my understanding on earth fault loop impedance testing is correct. A low efli is needed so a protective decive can operate in the required time, the lower the z the quicker it will operate. ZE= External resistance from borad to supply, board...

OFFICIAL SPONSORS

Electrical Goods - Electrical Tools - Brand Names Electrician Courses Green Electrical Goods PCB Way Electrical Goods - Electrical Tools - Brand Names Pushfit Wire Connectors Electric Underfloor Heating Electrician Courses
These Official Forum Sponsors May Provide Discounts to Regular Forum Members - If you would like to sponsor us then CLICK HERE and post a thread with who you are, and we'll send you some stats etc

YOUR Unread Posts

This website was designed, optimised and is hosted by untold.media Operating under the name Untold Media since 2001.
Back
Top