2391-10 Written Exam - 01/12/11

[cr0ft]

Just sat this tonight. What does everyone that sat it tonight think of the paper?

 

[Former Sponsor TM]

On Q21 for new electrical installation work I put an Electrical Installation Certificate accompanied with a Schedule of Test Results and a Schedule of Inspections, for the Inspection I put a Periodic Inspection Report for an Electrical Installation, again accompanied with a Schedule of Test Results and a Schedule of Inspections. It carried 6 marks so hopefully thats a mark for each one....

 

[firemanowl]

Q1 I think was the list on page 17 of GN 3?

Q4 was something along the lines of why do we do an initial verification:-
1, Confirm installation/circuit complies with designer's intentions
2, Designed, Installed and Inspected & Tested to comply with BS7671
3, Not damaged so as to impair safety
Just seen it in some notes, not sure where it came from though as nothing in GN3.

Don't you have to add a x1.2 correction factor to the volt drop formula to allow for the rise in temp when the circuit is under load?

Good luck to everyboby, only a couple of months to wait.

 

[SHOCKNOT]

Just sat this tonight. What does everyone that sat it tonight think of the paper?

I like others not too bad but questions 1 and 4 were confusing, I answered Q1 then when i got to Q4 thought isnt that the same as Q1. I answered for Q1 to ensure installation meets relevant stds, e.g bs7671, to ensure nothing in the installation is damaged and to ensure all equip is erected correctly.
for Q4 I answered to protect persons, livestock and property. My worry is that Ive got answers wrong way around.

 

[fredrico]

What was the special location that cant be connected to a TN-C-S system??

 

[Former Sponsor TM]

What was the special location that cant be connected to a TN-C-S system??

I put caravan park

 

[exnavysparks]

I put down caravan site for that one i think?

 

[exnavysparks]

what did ppl put down for the supplementary bonding Q i put agricultural location eventually after a lot of scribbling out and correcting lol

 

[pfjt]

I put bathroom for bonding. And mobile units for the tncs

 

[SHOCKNOT]

Dont know, I put both lots of documentation down but making sure that i said for the initial verification you require a EIC, SOI AND SOR, then for the PIR you need PIR, SOI AND SOR, however the SOI is shared between both (it covers both)

 

[SHOCKNOT]

I put caravans, some caravan parks are connected to tncs but you cannot connect caravans to a tncs arrangement so at some point you convert to tt.

 

[Jurasic Spark]

Q1 I think was the list on page 17 of GN 3?

Q4 was something along the lines of why do we do an initial verification:-
1, Confirm installation/circuit complies with designer's intentions
2, Designed, Installed and Inspected & Tested to comply with BS7671
3, Not damaged so as to impair safety
Just seen it in some notes, not sure where it came from though as nothing in GN3.

Don't you have to add a x1.2 correction factor to the volt drop formula to allow for the rise in temp when the circuit is under load?

Good luck to everyboby, only a couple of months to wait.

Q4 was something along the lines of why do we do an initial verification:-
1. All installed equipment complies to relevent standards.
2. Everything has been selected and erected in accordance with BS7671
3. No visual damage to impair safety
GN3 p17

 

[exnavysparks]

v drop Q.... was it.... (R1+RN) X Ib
0.38 ohms x 30A = 11.4 ???????

 

[SHOCKNOT]

Thats the answer i got 11.4, which i got to 4.95% so I think thats ok because all circuits you are allowed 5% except for lighting circuits (i think?).

 

[Banjo]

For the TN-C-S question i pit down Exibitions, shows and stands.

What did people put down for the max voltage on socket outlets with surge protection devices?

 

[firemanowl]

v drop Q.... was it.... (R1+RN) X Ib
0.38 ohms x 30A = 11.4 ???????

I think you have to apply a x1.2 correction factor to allow for the rise in temp when circuit under load?

 

[firemanowl]

250 v for surge protection

 

[Banjo]

250 v for surge protection

Good thats what i put. Then the next part of the question asked for wht are the test connections i put test between live conductors and live conductors to earth.

 

[firemanowl]

Thats what I put Banjo, i think it's only the test voltage that is different, the rest of the test is the same.

 

[fredrico]

Thats what i put Banjo. Is it a 60% pass mark for the exam? Its a total of 90 marks for section B and about 60 marks for section A ?? So you have to get 60% of 150 marks?? Also 1M ohm minimum resistance for the surge socket is what i put.

 

[Banjo]

I heard the pass mark floats at 60% to 70%, as they mark it so only a certain percentage pass i think. What didyou put for the question that asked the earth return parth on section A with TNCS, TNS & TT?