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Schedule of Inspections , page 340 ← ( 1 ) ( 2 ) in the making ,
Methods of Protection against Electric shock
Both basic & fault protection :
(i) Selv , ( Correctly Installed and used , Note 1 ●
(ii) Pelv , ( Same as Selv but with Earth , ←
(iii) Double Insulation , ( Protected by an layer of Insulation look for symbol , Note 2 ●
(iv) Reinforced insulation , ( Single layer of very strong insulation , Note 2 ●
Basic Protection , Note 3 ●
(i) Insulation of live parts ( All live parts Insulated where required , ←
(ii) Barriers or enclosures ( Correct IP codes . Check Definitions , ←
(iii) Obstacles ( Limited use Not Domestic , Note 4 ●
(iv) Placing out of reach ( 410-3-5 Note 5 ●
Fault Protection
(i) Automatic Disconnection of Supply ,
● Presence of Earthing Conductor , ( At intake , ←
● Presence of Circuit Protective Conductors , ( CPC in all Circuits , ←
● Presence of Protective Bonding Conductors’ , ( Water, Gas, Oil, etc , ←
● Presence of Supplementary Bonding Conductors , ( Mainly Bathrooms , ←
● Presence of Earthing Arrangements for Combined , ( Rare , ←
Protective and Functional Purposes ,
● Presence of Adequate Arrangement for ( Generators ←
Alternative Source(s) where Applicable
● Felv , ( Not Compliant with Selv , ← ●
● Choice and Setting of Protective and Monitoring ( Correct MCB or Fuse , ←
Devices ( for Fault and / or Overcurrrent Protection )
(ii) Non-Conducting Location , Note 6 ●
● Absence of Protective Conductors , ( Operating Theatres , ←
(iii) Earth-Free Local Equipotential Bonding , Note 6 ●
● Presence of Earth-Free Local Equipotential Bonding , ( Not Domestic ,
(iv) Electrical Separation , Note 7 ● ( Isolating Transformers , ← ●
Provided for one item of Current-Using Equipment ,
● Provided for More than One item of Current-Using Equipment ,
Additional Protection ,
● Presence of Residual Current Devices , ( 415 -1 ←
● Presence of Supplementary Bonding Conductors , ( 415-2 ←
(1) SELV - an Extra Low Voltage Systems which is Electrically Separated
From Earth and from Other Systems in Such a Way that a Single – Fault Cannot give Rise to the Risk of Electric Shock ,
The Particular Requirement of Regulations must be Checked ( see Section 414 )
(2) Double or Reinforced Insulation , Not Suitable for Domestic or Similar Installations if it is the Sole Protective Measure ( see 412-1-3 )
(3) Basic Protection – will Include Measurement of Distances where Appropriate ,
(4 ) Obstacles – only Adopted in Special Circumstances ( see 417-3 )
(5) Placing out of Reach – only Adopted in Special Circumstances ( see 417-3
(6) Non- Conducting Locations and Earth-Free Local Equipotential Bonding –
These are Not Recognised for General Application ,
May Only be used where the Installation is Controlled / Under the Supervision of Skilled or Instructed Persons ( see Section 418 )
(7) Electrical Separation – the Particular Requirements of the Regulations must be Checked if a Single item of Current-using Equipment is
Supplied from a Single Source , see Section 413, if More than One the Installation must be Controlled / under the Supervision of Skilled or
Instructed Persons , See Also Regulations 418-3
● IMD / 411.6.3 , Installed in a Location where Unskilled Personnel have Access shall be Designed or Installed in such a Way ,
Shall NOT be Possible to Modify the Settings , Except by Use of a Key, or a Tool or a Password ,
● RCM / Doesn’t Trip , Gives Warning of Problems , Used with IT Systems ,
● RCDs Do Not Protect against Overloads / Do Not Protect against Short Currents , “ Definitions “ ● RCD Operation, Current Balance ) Earth Fault Current Only , “ Definitions “
● RCCBs Residual Current Circuit-Breaker with Integral Overcurrent Protection , ( Not for Overload Short-Circuit ) “ Definitions “
● RCBOs Minimise Inconvenience in the Event of a Fault / Short-Circuit , Overcurrent Protection , “ Definitions “
● RCBOs Both Overload Short-Circuit Protection / Overcurrent Protection : “ Definitions “
● Overload Current , Overcurrent Occurring in a Circuit which is Electrically Sound , 431.1.1 / 430.3 ,
● Preliminary Design ( In ≥ Ib ) 433 , ● Overcurrents Requirements’ ( In ≥ Ib ) 434 , Domestic Installation ,
Fault Currents’ ( Earth Faults or Shorts-Circuits )
Overload Currents , ( Overcurrents may be ! ,
Cables must be-Able to Carry Overcurrents Without Damage , (Iz) 411 ,
411 , Fault / Protection is Provided by ( i ) ( ii ) , “ADS”
( iii ) , Protection by One Device ,
Three Methods’ for Achieving “ Fault-Protection “ 131.2.2 , ( i ) ( ii ) , ( iii ) ,
Protection Against Electric Shock to be Provided by Basic & Fault Protection , ( one Method Common to Both )
Methods of Protection against Electric shock
Both basic & fault protection :
(i) Selv , ( Correctly Installed and used , Note 1 ●
(ii) Pelv , ( Same as Selv but with Earth , ←
(iii) Double Insulation , ( Protected by an layer of Insulation look for symbol , Note 2 ●
(iv) Reinforced insulation , ( Single layer of very strong insulation , Note 2 ●
Basic Protection , Note 3 ●
(i) Insulation of live parts ( All live parts Insulated where required , ←
(ii) Barriers or enclosures ( Correct IP codes . Check Definitions , ←
(iii) Obstacles ( Limited use Not Domestic , Note 4 ●
(iv) Placing out of reach ( 410-3-5 Note 5 ●
Fault Protection
(i) Automatic Disconnection of Supply ,
● Presence of Earthing Conductor , ( At intake , ←
● Presence of Circuit Protective Conductors , ( CPC in all Circuits , ←
● Presence of Protective Bonding Conductors’ , ( Water, Gas, Oil, etc , ←
● Presence of Supplementary Bonding Conductors , ( Mainly Bathrooms , ←
● Presence of Earthing Arrangements for Combined , ( Rare , ←
Protective and Functional Purposes ,
● Presence of Adequate Arrangement for ( Generators ←
Alternative Source(s) where Applicable
● Felv , ( Not Compliant with Selv , ← ●
● Choice and Setting of Protective and Monitoring ( Correct MCB or Fuse , ←
Devices ( for Fault and / or Overcurrrent Protection )
(ii) Non-Conducting Location , Note 6 ●
● Absence of Protective Conductors , ( Operating Theatres , ←
(iii) Earth-Free Local Equipotential Bonding , Note 6 ●
● Presence of Earth-Free Local Equipotential Bonding , ( Not Domestic ,
(iv) Electrical Separation , Note 7 ● ( Isolating Transformers , ← ●
Provided for one item of Current-Using Equipment ,
● Provided for More than One item of Current-Using Equipment ,
Additional Protection ,
● Presence of Residual Current Devices , ( 415 -1 ←
● Presence of Supplementary Bonding Conductors , ( 415-2 ←
(1) SELV - an Extra Low Voltage Systems which is Electrically Separated
From Earth and from Other Systems in Such a Way that a Single – Fault Cannot give Rise to the Risk of Electric Shock ,
The Particular Requirement of Regulations must be Checked ( see Section 414 )
(2) Double or Reinforced Insulation , Not Suitable for Domestic or Similar Installations if it is the Sole Protective Measure ( see 412-1-3 )
(3) Basic Protection – will Include Measurement of Distances where Appropriate ,
(4 ) Obstacles – only Adopted in Special Circumstances ( see 417-3 )
(5) Placing out of Reach – only Adopted in Special Circumstances ( see 417-3
(6) Non- Conducting Locations and Earth-Free Local Equipotential Bonding –
These are Not Recognised for General Application ,
May Only be used where the Installation is Controlled / Under the Supervision of Skilled or Instructed Persons ( see Section 418 )
(7) Electrical Separation – the Particular Requirements of the Regulations must be Checked if a Single item of Current-using Equipment is
Supplied from a Single Source , see Section 413, if More than One the Installation must be Controlled / under the Supervision of Skilled or
Instructed Persons , See Also Regulations 418-3
● IMD / 411.6.3 , Installed in a Location where Unskilled Personnel have Access shall be Designed or Installed in such a Way ,
Shall NOT be Possible to Modify the Settings , Except by Use of a Key, or a Tool or a Password ,
● RCM / Doesn’t Trip , Gives Warning of Problems , Used with IT Systems ,
● RCDs Do Not Protect against Overloads / Do Not Protect against Short Currents , “ Definitions “ ● RCD Operation, Current Balance ) Earth Fault Current Only , “ Definitions “
● RCCBs Residual Current Circuit-Breaker with Integral Overcurrent Protection , ( Not for Overload Short-Circuit ) “ Definitions “
● RCBOs Minimise Inconvenience in the Event of a Fault / Short-Circuit , Overcurrent Protection , “ Definitions “
● RCBOs Both Overload Short-Circuit Protection / Overcurrent Protection : “ Definitions “
● Overload Current , Overcurrent Occurring in a Circuit which is Electrically Sound , 431.1.1 / 430.3 ,
● Preliminary Design ( In ≥ Ib ) 433 , ● Overcurrents Requirements’ ( In ≥ Ib ) 434 , Domestic Installation ,
Fault Currents’ ( Earth Faults or Shorts-Circuits )
Overload Currents , ( Overcurrents may be ! ,
Cables must be-Able to Carry Overcurrents Without Damage , (Iz) 411 ,
411 , Fault / Protection is Provided by ( i ) ( ii ) , “ADS”
( iii ) , Protection by One Device ,
Three Methods’ for Achieving “ Fault-Protection “ 131.2.2 , ( i ) ( ii ) , ( iii ) ,
Protection Against Electric Shock to be Provided by Basic & Fault Protection , ( one Method Common to Both )
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