usefull imfornaiton sparks , RCDs

[amberleaf]

form one Electrician to another hope this helps some were , please tell me ? Test 1
Adjust the current setting on the test meter to 100% of the rated trip current of the RCD and perform a test. !! This has be Replaced , ( OLD ) ↔ A general purpose RCD BS4293 !! should operate within 200mS ← . A general purpose ( OLD ) RCD BS4293 ↔ RCD BS-61008 ( New ) or RCBO to BS-61009 should operate within 300ms ← *

Test 2 An RCD provided for Basic Protection should have a rated TRIP current not exceeding 30mA If the RCD is rated at 30mA , adjust the current setting on the test meter to 150ma ( x5 ) and perform a test. The RCD must operate in a time not exceeding 40mS. *

Test 3 Adjust the current setting on the test meter to ½ ↔ 50% of the RCD trip current and perform a test. The RCD should not operate within 2 seconds
The Test Button : Finally operate the RCD by pressing its test button

RCD test Procedure ,
1 , Within 200mS for non delayed being one reason.
2 , Delayed being 300mS to 400mS allows better chance discrimination over a downstream 200mS device than a 130mS to 500mS might do over a 300mS device being another reason
Furthermore a factor of three of the tripping current should also be provided for discrimination i.e.

usually a delayed 100mA feeding a non delayed 30mA trip or ,

RCDs in Series : 531.2.9 ←

 

[acat]

I do wish you would stop doing this I dont have much hard drive space left. Only kidding its nice to have someone like you in the forum helps to make up for those who let the side down


Many thanks for your time and effort. Moving shortly but when Im back on the net I will join you and start posting sample questions for the C&G 2382



Chris

 

[amberleaf]

State the Recommended Sequence of test
Sequence taken from BS-7671 : 2008 part 6

Test ! Reasons !

Continuity of the Protective conductors R1 + R2 values , Metalwork and effective IR testing ,
Continuity of Ring final Circuit R1 + R2 values , no interconnected Ring , no Spurs ,
Insulation Resistance No Shorts between Line , Neutral , & Earth
SELV No Connection between Low & Extra Low Circuits’
PELV No Connection between Low & Extra Low Circuits’
Electrical Separation No Connection between Low & Extra Low Circuits’
Basic protection by barrier or Enclosure No Contact by finger or Other solid More than 1mm
Insulation , Impedance of floor and walls , Effectiveness of high Resistance , Impedance Location
Polarity Switches , Fuses , Breakers , etc , in Live Side
Earth Electrode Resistance Resistive Contact of Electrode to Ground
Earth Fault Loop Impedance To meet Final Circuit Disconnection time in event Fault
Additional Protection RCD test To ensure RCD Operates in time in event Fault or Misuse
Prospective Fault Current To ensure Protective Devices can Disconnect Fault effectively
Check of Phase Sequence To ensure 3 Phase Motors etc Rotate incorrect direction
Functional Testing To test RCD test button , switches , Breakers , Locks etc Operates
Verifications of Voltage drop To ensure Voltage at Load end is within Required Limits

 

[scotsparky]

http://www.smileycentral.com/?partner=ZSzeb001_ZRxdm103YYGB http://www.smileycentral.com/?partner=ZSzeb001_ZRxdm103YYGB amber do you come in a handy sized pack i can pull out my van when i get stuck????

 

[amberleaf]

posting sample questions for the C&G 2382 ,

from George A BIG BIG thank you , that's all I was asking for to help other Electricians This City & Guilds 2392-10 Course is New to a lot of spark's it is a Minnie version of 2391( follow on )
so you can , : mad: understand my tutor was a lassie b----- base
I failed my City & Guilds test , I will do a re-sit this time i,ll PASS
it cost me 700 . this course was 3,days I feel the C/G should run this Course for 1 week
3 days is S--- for working spark's , there head up their B-- ps this is an Open book
I feel C/G don't know how to address this Course , I hope your removal is a easy One
Dot let Electrical s down now I,LL send the boys down form Scotland if you don't keep your word I,ll be watching this SPACE , Freedom , Big Thank You

“ Consumer Units “ Live parts must be contained inside enclosures or behind barriers providing a degree of protection of at least IP2X or IPXXB . 416.2.1 * The horizontal top surface of a readily accessible barrier or enclosure must provide a degree of protection of at least IP4X or IPXXD . 416.2.2 * All installations must be divided into separate circuits so as to comply with the following : - avoid danger and inconvenience if a fault develops * - allow safe maintenance, Inspection & testing * - prevent any danger that may be caused by the loss of supply to a single circuit e.g. a lighting circuit * - reduce the possibility of nuisance tripping of RCDs by equipment with high cpc currents produced in normal use e.g. computers * - prevent electromagnetic interference between items of electrical equipment * - prevent the accidental energising of an isolated circuit 314.1 *
“ IP2X Fire detection cables “ A double pole main switch or linked circuit breaker must be installed as close as possible to the incoming supply at the origin of the installation. 537.1.4 * Unless specifically labelled or suitably identified, all 13A socket outlets must be 30ma RCD protected. 411.3.3 * Fire detection circuits must be supplied independently of other circuits and not protected by an RCD protecting multiple circuits. 560.7.1 * Fire detection cables, not including metal screened fire resistant cables , must be adequately segregated from cables supplying other circuits. 560.7.7 * Extra Low Voltage circuits should not be run in the same wiring system as 230v circuits unless all ELV cables and conductors are insulated for 230v or separated by an earthed metal screen. 528.1 * All electrical equipment must be accessible for operation, inspection & testing, maintenance and repair. 132.12 * Before an installation or an addition / alteration to an installation is energised, inspection & testing, must be carried out to ensure the requirements of BS7671 have been met and an appropriate certificate must then be issued. 134.2.1 , 610.6 , 631.1 * Any defects found in the existing installation must be recorded on the Electrical Installation Certificate or Minor Electrical Installation Works Certificate. 633.2 * A single pole fuse or circuit breaker must be used with the line conductor only. 132.14.1 * Only a linked circuit breaker that breaks all related line conductors can be used with an earthed neutral conductor ,132.14.2 * All final circuits must be connected to a separate way in the consumer unit. 314.4 * In a ccu the neutral conductors and cpc's should be connected to their respective terminals in the same order as the phase conductors are connected to the mcb's. 514.1.2 * An unfused spur may be connected to the origin of a radial or ring final circuit in the consumer unit. 433.1 * All protective devices must be labelled. 514.8.1 * A periodic inspection notice must be fixed on or next to the CCU 514.12.1 * Where applicable an RCD notice must be fixed on or next to the CCU 514.12.2 * Where the installation contains wiring colours to two versions of BS7671 a warning notice must be fixed on or next to the CCU 514.14.1 * A voltage warning notice is only required where a nominal voltage exceeding 230v exists. 514.10.1 * ! part 2 to follow up ! watch this space , if you are reading this space your doing your JOB

 

[amberleaf]

A durable copy of the schedule from the electrical installation certificate must be fixed next to or placed inside the consumer unit. In addition to circuit details the schedule must also contain information about the protective measures used in the installation i.e. automatic disconnection of supply, electrical separation SELV , RCD . 132.13 , 514.9 * All literature supplied with fire detection equipment must be made available to the occupant of the dwelling. 560.7.12 * Fuses and mcb's must have a breaking capacity greater than or equal to the maximum PFC at the point where the device is installed. 432.1 A lower breaking capacity is allowed if another fuse or mcb with the necessary breaking capacity is installed on the Supply side and the energy let-through of both devices will not damage the fuse or mcb on the load side. 434.5.1 , 536.1 * Consumer units must be spaced at least 150mm away from gas pipes unless there is a pane of non combustible insulating material separating them. OSG p18 * In areas subject to flooding, consumer units should preferably be installed above flood water level. OSG p161 * Overcurrent protection devices must comply with one or more of the following standards : 533.1 * BS 88-2.2 * BS 88-6 * BS 646 * BS 1361 * BS 1362 * BS 3036 * BS EN 60898-1 & -2 * BS EN 60947-2 & -3 * BS EN 60947-4-1, -6-1 & -6-2 * BS EN 61009-1 *
!!!! Are they any bright sparks out their yet !!!

 

[amberleaf]

Safe working procedure : ( for Testers )

Regulation 12
Electricity at work Regulation 1988
Deals with means of cutting off the supply and for isolation , the Regulation requires that where
Necessary to prevent danger , suitable means ( including , where appropriate , methods of indentifying circuits )
Are made available :
* for Cutting off the Supply of Electrical Energy to any Electrical Equipment , and

* for the isolation of Electrical Equipment ,

Regulation 611.1 of BS-7671 : 2008
States that “ inspection shall precede testing and shall normally be done with that part of the installation under inspection disconnected from the supply ; ( that appropriate form of disconnection is isolation , )

Safe working procedure : ( for Testers )

Regulation 12
Electricity at work Regulation 1988
Deals with means of cutting off the supply and for isolation , the Regulation requires that where
Necessary to prevent danger , suitable means ( including , where appropriate , methods of indentifying circuits )
Are made available :
* for Cutting off the Supply of Electrical Energy to any Electrical Equipment , and

* for the isolation of Electrical Equipment ,

Regulation 611.1 of BS-7671 : 2008
States that “ inspection shall precede testing and shall normally be done with that part of the installation under inspection disconnected from the supply ; ( that appropriate form of disconnection is isolation , )

 

[amberleaf]

TN- systems PEN ( testers )

Residual current devices shall NOT be used on a TN- systems where a circuit incorporates :
( PEN conductors : ( Protective !! Earth Neutral ) C/G

Where PME conditions apply the C.S.A of the main equipotential bonding conductors shall be :
answer ( Determined after consultation with the supply undertaken ) * Before a supply will be granted by the Local Supply Authority the installation must comply with the :
( Electrical Supply Regulations , 1988 , ) C/G

“Insulation “ Basic Insulation is insulation covering live parts to provide protection against electric shock under fault free conditions. p20 * Supplementary Insulation is applied in addition to basic insulation for fault protection. p30 * Double Insulation comprises of basic and supplementary insulation. p23 * Reinforced insulation is insulation covering live parts that cannot be tested as supplementary or basic insulation. Reinforced insulation must provide a degree of protection equivalent to double insulation. p28 * The protective measure of reinforced or double insulation is applicable in almost all situations. 412.1.2 *
“Insulation “ Resistance SELV & PELV circuits must have a minimum insulation resistance of 0.5 Mega ohms when tested at 250v dc. with all current using equipment disconnected. 612.3.2 * Circuits up to 500v must have a minimum insulation resistance of 1.0 Mega ohms when tested at 500v dc with all current using equipment disconnected. 612.3.2 * These values are considered satisfactory. 612.3.2 * These values do not apply to fire detection systems. 612.3.2 * The insulation resistance must be measured between live conductors (including the neutral ) and between live conductors and the cpc connected to earth. 612.3.1 * If the circuit contains devices that may be damaged by the test, only a test between the live conductors connected together and the cpc connected to earth is necessary. 612.3.3 *