TESTING Ze Zs UNDERSTAND THE DIFFERENCE BETWEEN Ze AND Zs AND HOW TO TEST CORRECTLY
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- Опубліковано 13 вер 2020
- This video is all about how to test the impedance of electrical circuits correctly.
We must be able to understand the difference between Ze and Zs and be able to identify which parts of an electrical circuit they relate to.
It is essential that all electricians understand what these two values are, how they relate to the Zs tables in the Wiring Regulations and On-Site Guide, and ultimately how they can have a major impact on the health and safety of the users of the electrical system and occupants of the building.
Get this right and you can confidently sign off and certify your work with respect to electrical disconnection times for fuses and breakers.
The video deals with a must know piece of information, a fundamental requirement for all electricians.
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YES YOU HAVE ADDED MORE DOWN TO EARTH 🌎 KNOWLEDGE . MIGHTY THANKS .
Brilliantly said thanks 😊
Very well explained.
well explained, more clear than college
Great vedio many thanks for your explanations.
Wow! This is very informative, thanks for sharing it with us. It worth it and the best tutorial on the topic for me...dl
Brilliant man
Great video as always .Didn't know you did 2 x Ze tests, the second after reinstating the earthing conductor ..makes sense.Learner question: Do you leave luminaires IN or OUT on Zs Live test.If IN would you leave all switches ON to those luminaires,when testing furthest S/L and cpc.(i appreciate you are encouraged to do this by calculation).Thank you again
Please will you make a video on Pfc ,Pefc testing and recording on a 3phase installation. It is unclear when doubling the measurement of either if the Ze should also be doubled or not.
In a 400Vac Electric Motor the Zs Loop will be misured with load or whiout load. I mean the Zs loop need to be check with wire connected to the motor or disconnected from the motor? Thx
Thanks for the explanation. Why do the Certificates ask for Zs at the DB instead of Ze?
So measured Ze is most likely to be lower when the suppliers earth is connected to the earth bar, due to the parallel paths. Why then consider the Ze at the earth bar? Perhaps if we are expecting parallel paths due to gas or water bonding but don’t see a lower Ze, we can deduce that those bonds are deficient (need investigation) or are obsolete (plastic pipe). We should be measuring the resistance of those bonds separately in any case?
We measure R1+R2 at installation stage. Is that correct ? Is there a max R1+R2 value allowed. How do we know the reading is acceptable. When we measure Zs < 0.35 ohm the power is turned on.
Regarding calculation of r1 plus r1 with zs or ze given how can it be done
Where does the letter 'Z' come from? How come that letter was assigned? Same with the 'R' in R1 and R2? Thanks.
Do the 2 Ze tests apply to TT system? Thanks.
On the top box of the SOTR form it asks for the ZDB.
Imo this is gonna confuse learners - you say R1 + R2 is 'that part within the property including all the breakers, etc' - but R1 + R2 is just the measured continuity of line and cpc of an individual circuit, no?