some more 2391 questions

[wrighty]

hi guys,

i have a few more 2391 questions id like a bit of guidance with

1. state three different examples of a limitation that may be agreed with a client which is not already stated on the periodic inspection report.

a. access restrictions, evenings or weekends
b, interuption of supply to certain areas or equipment
c.


am i on the right track?


and

2. state three situations where the human sense of touch could be used by an inspector

i think i get this question, im just struggling to word it correctly and get all three situations

a, i would say check connection of conductors
b, check containment is securely fixed and supported throughout
c, check all ends of conduit are reemed and bushed where needed

cheers in advance.

less than 2 weeks until exam date and my brain seems to be really failing me at this moment in time.

 

[wrighty]

also

list three different protective conductors that may be installed in most electricial installations

is this:

circuit protective conductors
earthing conductor
main protective bonding conductors

or is it
incoming water service
incoming gas service
structural steel

or am i missing the point completely?

cheers again

 

[Ducksy]

hi guys,

i have a few more 2391 questions id like a bit of guidance with

1. state three different examples of a limitation that may be agreed with a client which is not already stated on the periodic inspection report.

a. access restrictions, evenings or weekends
b, interuption of supply to certain areas or equipment
c.

I'd say also dismantling fixings I.e kitchen cupboards or lifting floorboards ect

 

[Ducksy]

also

list three different protective conductors that may be installed in most electricial installations

is this:

circuit protective conductors
earthing conductor
main protective bonding conductors

or is it
incoming water service
incoming gas service
structural steel

or am i missing the point completely?

cheers again

I would say your on the mark with

circuit protective conductors
earthing conductor
main protective bonding conductors

 

[wrighty]

so im thinking down the right lines?

- - - Updated - - -

I'd say also dismantling fixings I.e kitchen cupboards or lifting floorboards ect

so im thinking on the right lines then

 

[Ducksy]

It seems so to me......tbh it's all down to the person marking it as they have a model answer for the questions.

 

[wrighty]

yeh i know, i know what i want to say, but its getting it down on paper that i seem to be struglling with,

im struggling with a calculation abit aswell

calculate the maximum permitted earth fault loop impedance for a circuit incorparating a 100mA RCD.

Zs IAN < 50v


500 x 100 / 50

is this right?

 

[wrighty]

sussed it i think,

50v / 0.1 = 500

 

[telectrix]

tick. 30mA is 1667Ω, 100mA is 500Ω, 300mA is 167Ω

 

[Ducksy]

sussed it i think,

50v / 0.1 = 500

Correct for RCD's

100mA = 500ohms

30mA = 1667ohms

Sorry edit didn't read question properly lol

 

[Ducksy]

Wrighty you should buy a book called electricians guide to the wiring regs best book for revision mate

 

[Sparkie30]

post deleted

 

[eganelectrical]

hi guys,

i have a few more 2391 questions id like a bit of guidance with

1. state three different examples of a limitation that may be agreed with a client which is not already stated on the periodic inspection report.

a. access restrictions, evenings or weekends
b, interuption of supply to certain areas or equipment
c.


am i on the right track?


and

2. state three situations where the human sense of touch could be used by an inspector

i think i get this question, im just struggling to word it correctly and get all three situations

a, i would say check connection of conductors
b, check containment is securely fixed and supported throughout
c, check all ends of conduit are reemed and bushed where needed

cheers in advance.

less than at this moment in mtime.[/QUOTE

Touch?
I used ...

Check loose connections
Check temp overheating
Sharp edges

 

[richard1972]

if you go onto cityandguilds website, then search 2391, then click on additional documents, there is city and guild reviews on how canidates done on previous papers, lots of info in there.

they dont tell you the questions, but by giving you details of where people went wrong, you get some usefull info, usually about 3-4 pages into report.


http://cdn.cityandguilds.com/Produc...s/2391_Chief_examiner_report_July_2011_v1.pdf