Re-take - Useful Information for 2394 :

[amberleaf]

(Main-protective-bonding-conductor ) Iv.e had this on three-jobs

Safety-Notice .
Itappears that the gas-installation-pipework fitted at your property may not haveElectrical-Equipotential-Bonding correctly fitted .

Iam required under section 18(2) of the Gas-Safety - Installation & Use .regulations 1998 to advise you that the Electrical-Installation should bechecked by a Competent Electrical Contractor .

Ifyou are a tenant of this property . would you please bring this card to theattention of the Owner or their Agent .

Usefuljunk . Still out there .

TN-S: the ( Old-two-part-cast-iron-clamp ) Old-style . BS-951-clamps . good indicator .
Ifthere is an . earth-soldered onto the lead-sheath of the incomer then chancesare pretty high that its always been a TN-S .

 

[amberleaf]

Facts: Useful junk

Suspended-ceilings:

Earthing& Bonding.
Inpractice . Unless there are very exceptionalcircumstances . which would need to be taken into account by thedesigner / Installer . “Conductive-part(s) “ of a suspended-ceiling will be neither .Exposed-conductive-part(s) nor Extraneous-conductive-part(s) . Consequently .in normal circumstances . suspended-ceilings ( Need )neither to be Earthed nor Equipotentially-bonded .

Electricalequipment such as .
-Luminaires .
-Lighting-tracks .
-Overhead-busbars .
-Air-conditioning units . &

Thelike incorporated in a suspended-ceiling will normally be of either Class 1 or Class 11construction .
□ Exposed-conductive-part(s)of Class 1 equipment are required to be connected to the (Main-earthing-terminal ) of the installation by a ( Circuit-protective-conductor )
□ Class 11 : equipmentis designed such that any insulation fault in the equipment cannot result infault current flowing into any ( Conductive-part(s) with which the equipmentmay be in contact .

Conductive-part(s)of a suspended-ceiling incorporating . Class 1 & / or Class 11 equipmentare therefore not intended to conduct . Earth-fault-current . & so suchparts need not be intentionally Earthed .
Some. Conductive-part(s) of a suspended-ceiling may be Earthed . however . byvirtue of fortuitous contact with . Exposed-conductive-part(s) . includingthose of . Class 1 equipment .

Unless there are .Exceptional-circumstances . the ( Conductive-part(s) of a suspended-ceiling .will not introduce a potential that does not already exist in the space inwhich the ceiling is installed . in normal-circumstances . therefore . there isno need to arrange for the ( Conductive-part(s) of the ceiling to be connectedto either a ( Main-bonding-conductor ) or to any (Supplementary-bonding-conductor(s)

Extractsfrom an article . 2005 . ◄

 

[amberleaf]

Usefuljunk . to Copy & Paste off the forum . to get rid of the red-writing . Etc

Gointo - Microsoft-words .
Gointo - Edit .click on “ select all “ ( it will turn all Black - its ok )
Thengo up to .” Font Color “ hit thebutton ▼ double click the black square .& it will change all to black . again .

 

[amberleaf]

2394: get your Head into GN-3 - 2011: that’s what its there for . “ Guidance “

StateThree - documents on which the value ofprospective fault current should be recorded .- at this point . look in page 391 . 397 .

(EIC ) - p.391 . Nature of Supply Parameters . Prospective fault current ( Ipf ) . “ kA “
Note - (2) . by enquiryor . by Measurement.

(EICR ) p.396 . Nature of Supply Parameters . Prospective fault current ( Ipf) .
Note - (2) . by enquiryor . by Measurement .

GN-3: p.57 .
Recordingthe Prospective fault Current . ( Ipf )
Boththe ( EIC ) & the ( EICR ) contains a box headed . Nature of SupplyParameters , which requires the ( PFC ) at the originto be recorded
Thisvalue to be recorded is the greater of ether the . Short-circuit current (Between live conductor ) or the Earth-fault current ( between line conductor(s) & themain-earthing-terminal )

If it is considered necessary to record valuesat other relevant points , the can be recorded on the . Schedule of Test Results
Where. the protective-devices used at the origin have the necessary rated breakingcapacity . & devices with similar breaking capacity are used throughout theinstallation . it can be assumed that the Regulations are satisfied in thisrespect for all distribution boards .

 

[amberleaf]

2394 : This is all you have to remember . it will standyou fast . Exams . yeah

Earth-Fault-Loop-Impedance testing - ( Ze )

When Measuring ( Ze )the means of ( Earthing )
Earthing-Conductor must be disconnected from the Installation for the duration of the test. To remove parallel-paths .
- External-Loop-Impedance- ( Ze )

For Obvious Reasons . ( Ze)
The - Earthing-Conductor . must be reconnected ( Before - re-energising ) the supply to theInstallation . -&-s for Safety-Reasons . Exams

Measuring ( Zs ) neither the means of Earthing or theBonding-conductors must be disconnected to Retainthe ( Parallel-Path ) Lower ReadingsΩ .
2394 : Circuit-Loop-Impedance ( Zs)

 

[amberleaf]

Equipotential-bonding: will always be required where ( Protectionagainst Electric-shock )

 

[amberleaf]

2394: Point to Note : MET-Testing !

AsRegulation . reminds us . 543.1.1.
Tofacilitate ( Measurement ) of the résistance ofthe . Earthing-arrangements . means shall be provided in an ( Accessible-position) for disconnecting the ( Earth-conductor ) Such means may convenientlybe combined with the . main-earthing-terminal or bar . any joint shall becapable of disconnection only by means of a tool .

 

[amberleaf]

Safeworking practices .

Motor-Circuits. GN-3 . p.76
Loop-Impedance-Tests . on Motor-Circuits
Canonly be carried out on the ( Supply-Side ) of isolated motor-control gear .
Continuity-test. between the circuit protective-conductor & the Motor is then necessary.

 

[amberleaf]

byDefinition :” Old & New “

Wedo all interperate the Regulations . As we see fit . No surprise that this isinterpreted in a 100 different ways .

2001:Bonding-conductor . A . Protective-conductor– ( Providing ) Equipotential-bonding .
2008: Bonding-conductor. A . Protective-conductor – ( Providing ) Equipotential-bonding .
2011:Bonding-conductor . A .Protective-conductor – ( Providing )Equipotential-bonding .

Ialways kick myself for not knowing what seems Obvious when Explained .

2001: Equipotential-bonding :Electrical connection maintaining various . Exposed-conductive-parts &Extraneous-conductive-parts . at substantially the same potential .
2008: Equipotential-bonding :Electrical connection maintaining various . Exposed-conductive-parts &Extraneous-conductive-parts . at substantially the same potential .
(see Protective-equipotential-bonding )
2011: Equipotential-bonding :Electrical connection maintaining various . Exposed-conductive-parts &Extraneous-conductive-parts . at substantially the same potential .
(see Protective-equipotential-bonding )

Equipotential: ( E-qui-po-ten-tial ) - havingthe same potential . Equal- potential
Equipotential-bonding: ( Connecting ) by connecting we are ( Bonding) ( E-qui-po-ten-tial ) Bonding . making me . Equal- potential
2011 : Equipotential-bonding: ( Electrical connection) By - Definition . ( maintaining ) making me . Equal- potential

Whatabout Bonding !! . TheRegulations have defined it for Us . PS. I keep hearing about thismatter . it’s not in the Regulation’s .Bonding .

2011rotective- equipotential-bonding : By – Definition . ( E-qui-po-ten-tial ) Bonding. making me . Equal- potential . Making it . Forthe purpose of Safety .

Protective: giving or capable of giving ( Protection )
2011 rotective- equipotential-bonding: Something that Protects . By –Definition . 2008:2011: - For the purpose of Safety .

Thepurpose of. Main-protective-bonding . is to create an (Earthed-equipotential-zone ) all . Exposed-conductive-parts &Extraneous-conductive-parts within this ( Zone ) are connected to theMain-earthing-terminal - ( MET ) By – Definition . ( E-qui-po-ten-tial ) Bonding . making me . Equal- potential . Making it . For the purpose ofSafety .

Regulationsdefine Two . Protective-Bonding-Conductors .
i). Main-protective-bonding-conductor .

By-Definition .
Protective: giving or capable of giving ( Protection ) 2011: For the purpose of Safety .
Bonding: Connecting together ( Providing ) . Equal- potential .

ii). Supplementary-protective-bonding-conductor(s)– where required .

Plain-English : Bonding-Conductor : A ( Conductor ) used forEquipotential-bonding . By - Definition ( Main & Supplementary )Bonding-Off .

 

[amberleaf]

Continuousby Virtue of being Metal . Copper .

17[SUP]th[/SUP]Edition : has two-things going for it . RCD . & Equipotential-bonding . (Main-protective-bonding-conductor )
You have achieved this by the fact the . Water &Gas is already “ Bonded “

 

[amberleaf]

Oldmeets New .

O.S.G . BS-7671 : - ( 2001 ) 2004

Bonding& Earthing
Whenwas the “ Meaning use “ Main !!

16[SUP]th[/SUP] Edition - Main-Equipotential-Bonding . (this wording will be use for a long time )
16[SUP]th[/SUP] Edition - Main-Earthing-conductor .

2001 ) inconformance with the definition(s) of BS-7671: throughout this Guide the Term “Live-part “ . is used to refer to a . Conductor or Conductive-part . intendedto be energised in normal use . including a . Neutral-conductor .

17[SUP]th[/SUP] Edition- Equipotential-Bonding .
17[SUP]th[/SUP] Edition- Earthing-conductor .

2011 ) Live-part .Conductor or Conductive-part . intended to be energized in normal use .including a Neutral conductor but . by convention . not a PEN-conductor .

 

[Amp David]

Cheers amberleaf, any chance you could edit the posts and use a font that's a little harder to read:32:

 

[amberleaf]

Unwanted-tripping. ( Cooker )
OfRCDs can occur when a . protective-conductor current - ( PE ) orleakage-current causes unnecessary operation of the RCD .

Suchtripping can occur on ( Heating-elements Cooking-appliances )
Whichmay have . elements that absorb a small amount of ( Moisture )through imperfect-element-end seals when clod . When energised this ( Moisture ) provides a ( Conductive-path ) for increased leakage & could operate theRCD . the ( Moisture) dries out as the elements heats-up .

 

[amberleaf]

Amp-David . thank you .

Thefat cow jump over the moon . ?? Like this . is this better to read . Yeah

 

[amberleaf]

Regulation- 131.2.2.
2394: Regulations are telling us . Protection against - Fault-current .

131.2.2. goes on to confirm that . in connection with -Fault-protection . the application of the method of (Protective-Equipotential-Bonding ) isone of the . MostImportant . Principles for Safety .