2391 exam question? | on ElectriciansForums
Guest viewing is limited

Discuss 2391 exam question? in the Periodic Inspection Reporting & Certification area at ElectriciansForums.net

F

Flakey

hi there.
had a question in the exam just wanted to see if the answer was correct or not .
Q : earth electrode was tested 3 figures obtained were as followed: 158 ohm, 160 ohm, 162 ohm
A: 158,160,162/3 = 160 ohm?

the figures may not have been right but is this the method? I know the (Rt) reciprocal method but thought that because they stated it was an earth electrode then you take the mean of the three resistances that are taken i.e with t1 test rod 10x distance away based on the length of the earth rod and t2 in between Earth rod and t1 take reading. than with t2 6 meters further away from the earth rod take reading. than t2 6 meters nearer earth rod take reading.

many thanks

James
 
If anyone can recite any of the questions would be great as all is a blur once you leave the exam :)

Another question:
Q what is the purpose of the earth fault loop impedance test.
my answer : the purpose of the EFLI test is to confirm that the test result is satisfactory to allow current to flow so the protective device will operate withing the desired time!

i think my wording was crud to be honest but hope that explains it in some way for a few points :)
 
If anyone can recite any of the questions would be great as all is a blur once you leave the exam :)

Another question:
Q what is the purpose of the earth fault loop impedance test.
my answer : the purpose of the EFLI test is to confirm that the test result is satisfactory to allow current to flow so the protective device will operate withing the desired time!

i think my wording was crud to be honest but hope that explains it in some way for a few points :)

Sounds Ok, you could have added, that it confirms an earth path, but i wouldnt lose any sleep over it.

Cheers............Howard
 
To ensure that the efli is sufficiently low, (the max value permissible is tabulated according to the protective device) to allow enough of the PFC to flow under fault conditions, thus activating the protective device within the time specified by bs7671. Note. Several factors affect the disconnection time.
 

Reply to 2391 exam question? in the Periodic Inspection Reporting & Certification area at ElectriciansForums.net

Recommended Sponsor News

Quickwire Now Sponsor ElectriciansForums.net

I am sure you will join me in welcoming our newest sponsors of ElectriciansForums.net - Quickwire! They have decided to join us after seeing you guys discussing their products here. Now we have an expert on board that you can chat to @Quickwire-Sam who will be happy to answer your queries!

[ElectriciansForums.net] Quickwire Now Sponsor ElectriciansForums.net


@Quickwire-Sam said "At Quickwire, we're all about speed, safety, and reliability. We're a family-run business, and every Quickwire connector is proudly made right here in the UK, ensuring noticeable quality. In short, Quickwire is the fastest connection method on the market. Whether you're an experienced electrician or a DIY enthusiast, Quickwire makes electrical connections ridiculously quick and easy. We're passionate about blending British craftsmanship with innovation. If you have any questions or if there's any way we can help, please just ask me!"

Exclusive Forum Offer! Free euro 2024 wall chart for first 10 responses!

Hi everyone,

We have 10 exclusive Uheat EURO 2024 Wallcharts to giveaway for Electricians Forum Members! The first 10 people to reply YES to this thread - I will message and get them sent out to you just in time for this years tournament! GO GO GO

PCBWay Now Sponsor ElectriciansForums.net!!

I hope you will all join me in welcoming our newest sponsor to the forum PCBWay! You can contact their friendly people by sending a message to @PCBWay who will be happy to answer your queries.

Welcome to the community and thanks for your sponsorship!

[ElectriciansForums.net] PCBWay Now Sponsor ElectriciansForums.net!!

PCBWay provides services including PCB Prototype and batch Production, PCB Assembly (SMT), 3D Printing, CNC Machining, PCB Design, Electronics Modules Selling, etc. We are committed to meeting the needs of global makers from different industries in terms of quality, delivery, cost-effectiveness, and any other demanding requests in electronics.

[ElectriciansForums.net] PCBWay Now Sponsor ElectriciansForums.net!!

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