values

  1. P

    Zs Values.

    Hi Guys. Just a quick one, How do you measure Zs values on a lighting circuit which has no CPC's. Thanks guys.
  2. P

    Zs values on TT system

    Hi guys new to testing and about to do my first TT system tomorrow. Popped in today and did a quick Ze test and got 16.98 ohms. Zs values will not meet max values for 7671. Whats your thoughts guys. (what have I forgotten?). Pete
  3. ipd1961

    Max Zs Values

    Hope this will be of some assistance to everyone;) Sorry wrong values given
  4. B

    Zs values?

    Hi there I have another question for you guys.What is the maximum Zs values for different circuit breakers i.e type B,C,D also where would we find them and why the difference?
  5. S

    Max Zs values of bs 3871

    Hi Is the max Zs values of a bs3871 the same as a BS 60898 mcb as 60898 replaced the 3871? thanks
  6. S

    short circuit capactiy bs3871 type 2

    could anyone help me with the short circuit capacity and maximum permitted zs of a BS3871 type 2 MCB please. And if using the sheath on a micc cable as cpc what do you put in the cpc mm2, is putting sheath acceptable. Thanks Paul
  7. R

    hey guys continuity testing

    hey guys i am studying for my C&G level 3 and i have my practical inspection and testing next week and i cant find anywhere thae values that are aceptable when you read continuity on a lighting circuit for instances and they havent told us at college i presume it is somethning to do with the...
  8. P

    resistor values

    resistor value software for i pod Resistor Color Code
  9. S

    Zs values...

    Anybody know where that post wentt that showed you the acceptable zs values for each protective device? Thought it was a sticky but can't seem to find it anywhere. And before anybody says get a regs book I'm waiting for it to be delivered!
  10. E

    Poor Insulation Resistance Values with MICC

    Problems with a particular lighting circuit in a church run in MICC results in the MCB tripping intermittently. All lamps OK, good earth continuity at all light fittings, but only a L+N to E Inslation Resistance value of 2.23 MegOhm. I've also been told that when switching on other lighting...
  11. K

    resistance values swa

    Has anybody got resistance values of the armour of swa, Im in the middle of doing my 2391-20 project and wanting to get R1+R2 measurements Thanks in advance:)
  12. M

    resistance values

    hi i was juist watching this youtube clip about resistance in series and in parrallel and @ 2:48 of the clip he comes up with some values 60/3 & for the love of god i cannot work out anyone can put me right i would be most gratful thanks YouTube - Physics 13.4.2g - Parallel Circuit Example
  13. J

    r1+r2 values

    Can any please help and tell me what is really an acceptable value for r1+r2 Thanks:confused:
  14. P

    Two Voltage/CCurrent Values on Motor

    Motor Tags.doc - File Shared from Box.net - Free Online File Storage Got a few queries about the info on the motor tagsin the pics in the attachment. In the first one in the Voltage box, it has 220 Delta and 380 Star. Does this mean that when the motor is running in delta config, the voltage...
  15. T

    Zs Values for 17th Edition

    Hi I work in the controls industry as a commissioning engineer so I dont get involved in the installation. Anyway I have a house rewire to do it the first one in about 5-7 years I have a brown 16th Edition onsite guide could any on tell me if the table values in this book on page 92 are the...
  16. T

    TT System and Zs values

    Just thought i'd let you all know what i have been told by the 17th regulation tutor, and the elecsa technical department. I think one of you have already told me this (lenny). so just got it confirmed. If testing a TT System your max Zs values that are permitted by BS7671 as long as the...
  17. D

    IS THERE A WEBSITE FOR Ze VALUES

    Is there anyway of gaining Ze values for premises off the internet. just a thought that ive had while been sat here. cheers Dave
  18. Gnasher

    Earth loop values

    Here we go for my first post. I have been working as an electricien for 25 years This may cause some discussion? With reference to Earth loop values in the Bible. Has any one ever contacted the manufacturer of MCB’s to enquire to the specific loop values they publish? You may be...
  19. S

    Electronic recording of DEIC or PIR

    I am interested to know how members are getting on using electronic means to record their test results on site. How many people are using laptops, netbooks or PDAs. Personally I am unable to get on with a PDA but am thinking of using a Samsung netbook which is 10" screen and 8 hr battery life...
  20. C

    Max Zs on a 30ma RCD

    Hey all, I seem to have it in my head that the max zs, regardless of what breaker you do the test from, on a 30ma rcd is 1667 ohms. But I can only find a reference to this when it comes to tt systems. Does this still apply on tns, tncs systems and if so where is it in the regs? Thanks all in...
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