Aico Carbon Monoxide Detectors
This official sponsor may provide discounts for members

Discuss **City & Guilds 2392-10 Course notes** in the Electrical Courses and Electrical NVQ's area at ElectriciansForums.net

A

amberleaf

Welcome to ElectriciansForums.net - The American Electrical Advice Forum
Head straight to the main forums to chat by click here:  American Electrical Advice Forum

Inspection & Testing Methods : City & Guilds 2392-10 fundamental Course

( Before : Test prior to the Installation being Energized )

Test – Sequence of Tests ,

( 1 ) Continuity of Bonding conductors and Protective conductors’ : Low reading ohmmeter 
( 2 ) Continuity of Ring Final Circuit Conductors’ : Low reading ohmmeter 
( 3 ) Insulation Resistance : 500V dc : 1.0m TN-C-S systems 0.4 s under 32A
• Instrument setting used for conducting insulation resistance Tests ( m ) C/G
( 4 ) ” Dead Test ” Polarity of each circuit : *** Low reading ohmmeter 
• Which one of the following ” Dead Tests ” should also be repeated ” Live” ( Polarity ) C/G

“ After ” : Test Following Installation being Energized :

( 1 ) Earth fault loop impedance : ( Ze ) ( Zs )
( 2 ) Live polarity of Supply : ***
( 3 ) Prospective fault current : ( PFC ) ***
• PSCC : the expected current during a short-circuit fault the ( Prospective Short- Circuit Current ( PSCC ) C/G

( 4 ) Functional testing : ( RCD Testing )
• Which one of the following devices is Not designed to protect against Overload Currents C/G
• This is Designed to protect against Earth Leakage Currents Only ( RCD )

“Continuity of Bonding Conductors “
( 1 ) Safely isolate the Supply :

( 2 ) Disconnect one end of the Conductor , preferably the end at the Consumer unit :

( 3 ) ( Null out test Leads ) or ( Record and remember to Subtract from End Result )

( 4 ) Connect one test Lead at the Consumers units Disconnected end :

( 5 ) Connect the other test Lead to Metal work of which the Conductor you are Testing is Connected to
( Ensure any painted Metal work has been Scratched off , to make a Solid connection )
By not Connecting it to the Clamp will prove that the Integrity of that Clamp is Efficient enough / Correct BS-951 :

( 6 ) Test – the Result will give the Total resistance of the Conductor :
( Remembering to Subtract the Test Leads Resistance , if not Previously pulled out )

( 7 ) Re – Connect Bonding Conductor :

Documents :
( a ) Electricity at Work Regulations 1989 :
( b ) Health and Safety Executive Guidance Note GS38 :
( c ) BS7671 – Requirements for Electrical Installations :

Instruments
( Before : Test prior to the Installation energized )
( a ) Continuity of protective conductors – Low reading ohmmeter 
( b ) Continuity ring final circuit – Low reading ohmmeter 
( c ) Insulation resistance – Insulation resistance tester M
( d ) Live polarity – GS38 compliant voltmeter or test lamp
( e ) multi - probe test instrument : Earth electrode tester
Insulation Resistance 230V Installation : M
500V
250 dc 0.5 M
500 dc 1 M
RCD tests :
( a ) Earth loop impedance determines that an earth fault loop path exists ( Earth loop impedance tester )
( b ) Functional test determines that the RCD will actually operate in the event of a fault – electro-mechanical test using the ‘T’ button
( c ) Max test current for 100mA RCD is 100mA

IP Codes :
Intermediate barriers – IP2X or IPXXB
Horizontal top surfaces

( i ) Continuity and “ R2 “

( ii ) Earth fault loop impedance . ( Zs ) is the Measurement of the whole of the Fault path

Columns ( 6 ) and ( 7 ) of the Schedule of test Results page : 341
Require Measurements of ( R1 + R2 ) or R2 to be noted , may be simply a continuity test To ensure that the Line
and the Protective Conductors’ are Continuous ,

( R1 + R2 ) may also be recorded : ( Checking that the Earth Fault Loop Impedance is Sufficiently Low : and R2
: The requirements of the alternative method are met – see regs : page 243 ?


( Single phase TN-C-S installation has a Ze of 0.015 ohms. Calculate Prospective fault current :

Appendix 3 of BS7671 gives this relationship:

Uo
Zs = ------ where Uo = open circuit voltage at transformer , and is taken as 230 V
Ia

Uo 230
So the calculation is : Ia = ------ = -------- = 15333. kA ( 16 kA
Zs 0.015
 
Last edited by a moderator:
Wetroom Store - Network Wetroom Suppliers
This official sponsor may provide discounts for members
A

amberleaf

  • Thread Starter Thread Starter
  • #3
You must be logged in to see the message.
 
Last edited by a moderator:
A

amberleaf

  • Thread Starter Thread Starter
  • #6
You must be logged in to see the message.
 
Last edited by a moderator:
A

amberleaf

  • Thread Starter Thread Starter
  • #9
You must be logged in to see the message.
 
Last edited by a moderator:
A

amberleaf

  • Thread Starter Thread Starter
  • #12
You must be logged in to see the message.
 
Last edited by a moderator:
A

amberleaf

  • Thread Starter Thread Starter
  • #15
You must be logged in to see the message.
 
Last edited by a moderator:
A

acat

  • Thread Starter Thread Starter
  • #18
You must be logged in to see the message.
 
T

tscheung

  • Thread Starter Thread Starter
  • #21
You must be logged in to see the message.
 
A

antimatter

  • Thread Starter Thread Starter
  • #24
You must be logged in to see the message.
 
S

SLSpark

  • Thread Starter Thread Starter
  • #27
You must be logged in to see the message.
 
S

spencerwalters

  • Thread Starter Thread Starter
  • #30
You must be logged in to see the message.
 

Reply to **City & Guilds 2392-10 Course notes** in the Electrical Courses and Electrical NVQ's area at ElectriciansForums.net

SuperlecDirect - ElectriciansForums.net Electrical Suppliers
This official sponsor may provide discounts for members
Top Bottom