***Useful Information For The Working Sparky***

[amberleaf]

“ Rcd's “

Fire detection circuits must be supplied independently of other circuits and not protected by an Rcd protecting multiple circuits. 560.7.1 All circuits in a bath shower room must be protected by a 30mA RCD. P166, 701.411.3.3
Where applicable an RCD notice must be fixed on or next to the CCU 514.12.2 An RCD should not be used as a main switch 314.2 If the maximum Zs values for a circuit in a TN systems cannot be met, the circuit may be protected by a 30mA RCD. 531.3.1
If the maximum Zs values for a TN systems cannot be met, the installation may be protected by an 100mA RCD and treated as a TT systems . 531.3.1 : 411.5.1 : 411.5.2 : 411.5.3
Unless specifically labelled or suitably identified, all 13A socket outlets must be protected by a 30mA Rcd. 411.3.3
In a TN systems , the part of a lighting circuit in a bath or shower room is required to be 30mA RCD protected. 411.3.3 , 701.411.3.3

Where a cable is buried in a wall or partition at a depth of less than 50mm on either side it must be sufficiently mechanically protected against penetration OR RCD protected AND installed either horizontally within 150mm of the top of the wall or vertically within 150mm of the angle formed where two walls meet or run horizontally or vertically to an accessory, luminaire or CCU 522.6.6 , 522.6.7 . This applies to a cable in a partition constructed using metallic parts other than fixings irrespective of the cable depth. 522.6.8

Surface run cables do not require RCD protection. OSG p22

A single RCD protecting a TT systems must be installed at the origin of the installation unless the part of the system between the origin and the RCD fulfils the requirements for protection by Class 11 equipment or equivalent insulation 531.4.1

All Electrical equipment must be accessible for operation , inspection & testing maintenance and repair. 132.12

Rcd Test Procedure

Many RCD test meters have a facility where tests can be carried out during the positive or negative half of the supply cycle. For tests 1 & 2 the RCD operating time to be recorded is the longer of the two measured during the half cycle tests.

DO NOT press the test button on the RCD before testing as this can temporarily reset a faulty RCD

Test 1
Adjust the current setting on the test meter to 100% of the rated trip current of the RCD and perform a test. A general purpose BS4293 RCD should operate within 200mS . A general purpose BS-61008 RCD 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 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

[Jason.S]

Another useful post there Mr Leaf.

Ill stick this one too, and i would respectfully ask members to refrain from posting here so that we can keep the thread clear.

Thanks.

[amberleaf]

“ Certification & Reporting “
Before an Installation or an additions & alterations’ to an installation is energised, inspection and testing must be carried out to ensure the requirements of BS-7671 have been met and an appropriate certificate must then be issued. ( 134.2.1, 610.6 631.1 )
Steps must be taken to avoid damage to property and equipment and to avoid danger and injury to persons during inspection and testing. 610.1
Any defects found in the existing installation must be recorded on the Electrical Installation Certificate or Minor Electrical Installation Works Certificate. 633.2
A 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 a contain information about the protective measures used in the installation i.e. automatic disconnection of supply, electrical separation SELV , RCD, 132.13 514.9

The Periodic Inspection Report must only be used to report on the condition of an existing installation. p339

BS-7671 does not give specific details on the frequency of periodic inspection & testing of a domestic installation. 622.1. Guidance Note 3 suggests every 10 years or every change of occupancy.

The Minor Works Certificate must only be used where additions & alterations’ to an existing installation do not include a new circuit. p336 , 631.3

The Electrical Installation Certificate must only be used to certify a new installation, new circuits in an existing installation or new work that includes additions & alterations’ to an existing installation. An Electrical Installation Certificate must not be used to report on the condition of an existing installation. p334 , 631.1

NICEIC Domestic Electrical Installation Certificates require that an additional 'Certificate of Design, Installation & Commissioning Of A Fire Detection & Alarm System Of Grade B, C, D, E or F In A Dwelling' must be provided for any fire detection systems including smoke alarms that are part of the installation.

Electrical separation is a protective measure for circuits up to 500v ac. 413.3.2 An example of electrical separation in a domestic installation is a shaver socket.
Protection by electrical separation in a bathroom or shower must only be used for :
a. one single socket outlet, or

b. circuits supplying one item of current using equipment 701.413

All circuits in a bathroom or shower room must be protected by a 30ma RCD p166, 701.411.3.3

Only one item of current using equipment may be supplied using electrical separation. 413.1.2, 701.413

All items of current using equipment must be provided with a functional switching device. 537.5.1.3

Electrical floor heating systems must not be supplied using electrical separation. 701.753

All electrical equipment must be accessible for operation, inspection & testing, maintenance and repair. 132.12

For more information on electrical separation see 413.1, 418.3, 701.1, 612.4.3

“ Incoming Supply “

A main switch must be provided to cut off the voltage to an installation. 132.15.1 *

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 *

If an installation in the United Kingdom does not comply with Chapter 13 of BS-7671 the electricity supplier does not have to provide a supply to the property. p241 *

A TN-S supply has separate neutral and protective conductors. All the exposed conductive parts of the installation must be connected to the protective conductor at the main earthing terminal. p30, p33 *

A TN-C-S supply has a combined neutral and protective conductor. All the exposed conductive parts of the installation must be connected to the combined neutral and protective conductor at the main earthing terminal. This type of system is also known as PME (protective multiple earthing). p30, p33 *

PME submains are not permitted. 543.4.9 *
230v final circuits in a TN system not rated greater than 32A must disconnect within 0.4 seconds under fault conditions. 411.3.2.2 *
Under fault conditions in a TN system, circuits over 32A including distribution circuits must disconnect within 5 seconds. 411.3.2.3 *
If the maximum Zs value for a circuit in a TN system cannot be met, the circuit may be protected by a 30ma RCD. 531.3.1 *
If the maximum Ze value for a TN system cannot be met, the installation may be protected by a 100ma RCD and treated as a TT system. 531.3.1 , 411.5.1 , 411.5.2 , 411.5.3 *
A TT supply has the exposed conductive parts of the installation connected to an earth electrode which is separate from the earth of the supply. p30 , p34 *
A single RCD protecting a TT system must be installed at the origin of the installation unless the part of the system between the origin and the RCD fulfils the requirements for protection by Class II equipment or equivalent insulation . 531.4.1 *
230v final circuits in a TT system not rated greater than 32A must disconnect within 0.2 seconds under fault conditions. If disconnection is made by a fuse or mcb and all extraneous conductive parts are connected to the main equipotential bonding then a disconnection time of 0.4 seconds is permitted. 411.3.2.2
Under fault conditions in a TT system, circuits over 32A including distribution circuits must disconnect within 1 second. 411.3.2.4 *
For more information about TT systems see 411.5.2, 612.8.1 * It is assumed that where an installation is supplied in accordance with the Electricity Safety, Quality and Continuity Regulations 2002 the connection between the supply neutral and earth is permanent. 114.1 *
The incoming supply to a domestic property is 230v with a permitted tolerance of +10% / - 6% ie 216.2v - 253.0v. p 242 *
Meter tails are part of the consumers installation and are to be provided by the installer. Meter tails must be sheathed and insulated or if insulated only must be enclosed in trunking or conduit. Meter tails must be 25mm. Where the meter tails are protected against fault current by the main fuse the installation method, maximum length and minimum cross sectional area must meet the distributors requirements. OSG p17
A distribution circuit is the circuit that connects the incoming supply to the ccu i.e. meter tails. When a distribution circuit supplies an installation remote from the incoming supply it is sometimes referred to as a sub main. p23

Extractor Fans Extractor fans must be provided with an easily accessible means of switching off the supply 132.15.2 Electrical Equipment that may cause injury during mechanical maintenance i.e. fans, must be provided with a means to switch off the supply. 537.3.1.1 All items of current using Equipment must be provided with a functional switching device. 537.5.1.3 All Electrical Equipment must be accessible for operation, inspection & testing , maintenance and repair. 132.12
“ Immersion Heaters “
An immersion heater must not be supplied by a ring final circuit. p362, 433.1.5
An immersion heater must be connected to the supply by a double pole linked switch only. The use of a plug top and socket outlet is not permitted. 554.3.3
An immersion heater must be provided with a thermal cut-out to prevent the water from boiling if the thermostat fails. 554.2.1
All final circuits must be wired separately from all other final circuits. 314.4
All Electrical Equipment must be accessible for operation, inspection & testing, maintenance and repair. 132.12

[amberleaf]

“ Lighting Circuits “
All electrical equipment must be accessible for operation, inspection & testing, maintenance and repair. 132.12 Where an installation has only one lighting circuit, the circuit may need to be divided into two circuits to minimize the danger that may arise in the event of a fault. 314.1 (iii) Light fittings must be installed so that any radiated heat does not cause any damage. 559.5.1 The fixing supporting a light fitting must be able to support a weight of at least 5kg. 559.6.1.5 Domestic lighting circuits should not be rated at more than 16A. 559.6.1.6 Edison screw lampholders (excluding types E14, E27 ) should have the outer contact connected to the neutral conductors’ . 559.6.1.8 Lighting circuits must be controlled by the appropriate number of switches. 559.6.1.9 p146 Through wiring is only permitted in a light fitting where the light fitting is designed for such wiring. 559.6.2.1 p146 Through wiring in a light fitting must be suitable for the temperature generated inside the fitting. 559.6.2.2 The lamp inside an outdoor light fitting mounted less than 2.8m above the ground must only be accessible after removing an enclosure or barrier with the use of a tool. 559.10.3.1 Electrical equipment outdoors must be rated at least IP33. 559.10.5.2 Switch lines must be marked brown at their terminations. 514.3.1, p91

Lighting Circuits In A Bath Or Shower Room
In a TN Systems the part of a lighting circuit in a bath or shower room is required to be 30ma RCD protected. P47 , 411.3.3 , p166 , 701.411.3.3 Electrical equipment installed within zone 0 must be at least IPX7. 701.512.2 Only switches that are built into fixed Electrical equipment and the insulated pull cords of pull cord switches are permitted in zone 0. No other switches or accessories are allowed. 701.512.3 Only SELV equipment not exceeding 12v ac or 30v dc is permitted in zone 0. The SELV equipment must be fixed and permanently connected with the transformer and isolator outside zones 0, 1 & 2. 701.55 Electrical equipment installed within zone 1 must be at least IPX4 . 701.512.2 Only switches that are built into fixed Electrical equipment , the insulated pull cords of pull cord switches and switches of SELV circuits not exceeding 12v ac or 30v dc are permitted in zone 1. The SELV transformer and isolator must be outside zones 0, 1 & 2. No other switches or accessories are allowed. 701.512.3 p167 Light fittings are permitted in zone 1 and must be fixed and permanently connected. 701.55 Lighting fittings and switches installed within zone 2 must be at least IPX4. 701.512.2 Only switches that are built into fixed Electrical equipment , the insulated pull cords of pull cord switches, BS EN 61558-2-5 shaver units and socket outlets’ and switches of SELV circuits not exceeding 12v ac or 30v dc are permitted in zone 2. The SELV transformer and isolator must be outside zones 0, 1 & 2. No other switches or accessories are allowed. 701.512.3 For information on extra low voltage lighting see 559.11 For information on suspended lighting systems see 559.11.6 All final circuits must be wired separately from all other final circuits. 314.4

[amberleaf]

“ Fire Detection “ part P : for testers
All electrical equipment must be accessible for operation, inspection & testing , maintenance and repair. 132.12 *
NICEIC Domestic electrical Installation Certificates’ require that an additional 'Certificate of Design, Installation & Commissioning Of A Fire Detection & Alarm System Of Grade B, C, D, E or F In A Dwelling' must be provided for any fire detection systems including smoke alarms that are part of the installation. * Fire detection circuits must be supplied independently of other circuits and not protected by an RCD protecting multiple circuits. 560.7.1 * All literature supplied with fire detection equipment must be made available to the occupant of the dwelling. 560.7.12 * Fire detection cables, not including metal screened fire resistant cables, must be adequately segregated from cables supplying other circuits. 560.7.7 * BS-7671 does not provide detailed information for fire detection systems and is supplemented by BS 5839. p12 * The Building Regulations 1991 require all new and refurbished dwellings to be fitted with mains operated smoke alarms. The requirements for single family homes of not more than two storeys are that self-contained smoke alarms should be installed as follows : ** (i) at least one smoke alarm on each floor * (ii) within 7m of kitchens and living rooms and other areas where fires may start * (iii) within 3m of all bedroom doors * The smoke alarm must be installed in accordance with the manufacturers’ instructions, generally on ceilings and at least 300mm from any wall or ceiling light fitting ** The smoke alarms have to be interconnected, have a battery backup, and be permanently supplied from a separate way in the ccu , or supplied from a local lighting circuit that is regularly used. Please note this requirement conflicts with 560.7.1 Except for TT systems, the circuit supplying a smoke alarm should not be protected by an RCD. For TT systems the smoke alarm must be supplied from the fixed equipment section of the ccu, not through a 30mA RCD. ** The cables supplying each self-contained smoke alarm and supplying the interconnections between smoke alarms do not have to be fire retardant and need not be segregated. ** The Grade System - is the system of engineering, not the level of protection. * Grade F - one or more battery powered smoke and heat alarms. * Grade E - a system of interlinked mains powered smoke and heat alarms with NO battery back up. * Grade D - a system of interlinked mains powered smoke and heat alarms with battery back up. * Grade C - a system consisting of smoke detectors and sounders (which may be smoke alarms) connected to a common power supply, comprising of mains power and a stand by supply with central control equipment * Grade B - fire detection and alarm system comprising of fire detectors (other than smoke alarms), fire alarm sounders and control and indicating equipment to either BS EN 54-2 and power supply to BS EN 54-4, or to Annex C of BS 5839 pt6. * Grade A - fire detection incorporating control and indicating equipment to either BS EN 54-2 and power supply to BS EN 54-4 installed to BS 5839 : Pt 1 with some minor exceptions’. * Grade D is required for new, owner occupied buildings of up to three storeys, two storey rented properties, and existing owner occupied buildings of up to two storeys. Very large storeys may require a Grade B alarm system. * Levels Of Protection * LD1 - a system installed throughout the dwelling, incorporating detectors in all circulation spaces that form part of the escape routes from the dwelling and in all rooms and areas in which fires may start, other than toilets, bath and shower room ** LD2 - a system incorporating detectors in all circulation spaces that form part of the escape routes from the dwelling, and in all rooms or areas that present a high risk of fire. ** LD3 - a system incorporating detectors in all circulation spaces that form part of the escape routes from the dwelling.

[amberleaf]

“ FELV, PELV & SELV “

All items of current using equipment must be provided with a functional switching device. 537.5.1.3 *

FELV (functional extra low voltage) is an extra low voltage system (up to 50v ac, 120v dc) without all of the protective measures applied to PELV or SELV. p24 *

For more detailed information on FELV see 411.7, 612.4.4

PELV ( protective extra low voltage ) is an extra low voltage system ( up to 50v ac, 120v dc ) with a connection to earth. p27 *

For more detailed information on PELV see 414.1, 612.4.2 *

SELV ( separated extra low voltage ) is an extra low voltage system ( up to 50v ac, 120v dc ) with no connection to earth. p29 *

For more detailed information on SELV see 414.1, 612.4.1 *

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 *

“ Underfloor Heating “ All items of current using equipment must be provided with a functional switching device. 537.5.1.3 * Electric floor heating must not be protected by electrical separation. 701.753 * All circuits in a bath or shower room must be protected by a 30ma RCD. 701.411.3.3 * Electric floor heating in a bath or shower room must have a metal enclosure or sheath or a fine mesh metallic grid connected to the cpc of the supply circuit SELV supplies excluded ). 701.753 p/168 * All electrical equipment must be accessible for operation, inspection & testing, maintenance and repair. 132.12 * For more information on electric floor heating see 554.4, 753.1 *

“ Reference Methods “
PVC cables surface clipped - C
Armoured cables surface clipped - C
MICC cables surface clipped - C
PVC cables installed directly in an insulated wall - A
PVC cables installed in a building void - B
PVC cables in metal / plastic conduit or trunking surface mounted on a wall - B
PVC cables in metal / plastic conduit installed inside an insulated wall - A
PVC cables in metal / plastic conduit installed inside a building void - B
For more detailed information see Table 4A2 p261

[Mac]

[quote=Jason.S;44910]Another useful post there Mr Leaf.

Ill stick this one too, and i would respectfully ask members to refrain from posting here so that we can keep the thread clear.

Thanks.[/quote
Hi Jason,all these threads that amberleaf is posting,is there anyway that they can be compressed by the admin into a sort of folder or something.Just a ?.He is doing a great job

[amberleaf]

“ Basic & Fault Protection “
Basic Protection is protection against electric shock under normal operating conditions. , p20
Fault Protection is protection against electric shock with regard to a failure of basic insulation, p24
Exposed conductive parts of less than 50mm2 are exempt from fault protection. 410.3.9 *

Cables
Fire detection cables, not including metal screened fire resistant cables, must be adequately segregated from cables supplying other circuits. 560.7.7 * Cables must be suitably supported i.e. clipped or installed in conduit or trunking. 522.8.4 * Cables should be installed so as to avoid any possible damage caused by mechanical stress. 522.6.1 * Non sheathed cables (excluding protective conductors) must be installed in conduit, trunking or ducting. 521.10.1 * Cables must be not installed where they can be affected by heat from an external source. 522.2.1, 528.3.1 * Cables passing through a joist must be 50mm from the top or bottom of the joist or be sufficiently protected against damage. 522.6.5 * Where a cable is buried in a wall or partition at a depth of less than 50mm on either side it must be sufficiently mechanically protected against penetration OR Rcd protected AND installed either horizontally within150mm of the top of the wall or vertically within 150mm of the angle formed where two walls meet or run horizontally or vertically to an accessory, luminaire or ccu. 522.6.6 , 522.6.7. This applies to a cable in a partition constructed using metallic parts other than fixings irrespective of the cable depth. 522.6.8 * Surface run cables do not require RCD protection. OSG p22 * Cables buried underground must be armoured or have a metal sheath or be installed in a metal conduit or duct. Buried cables must be identified by cable covers or marking tape and buried at sufficient depth to avoid damage. 522.8.10 * Cables should not be run through a load bearing part of a building if the integrity of the load bearing part is compromised by the passage of the cable. 522.8.14 * Wherever possible cables should not be covered by thermal insulation. A cable covered by thermal insulation for more than 0.5m must have its current carrying capacity derated by a factor of 0.5. For more information see 523.7 *Where the sheath has been removed from a cable its cores must be enclosed within an accessory or enclosure of the appropriate standard. 526.9 * When a cable, conduit or trunking passes through a wall or floor it is necessary to seal the hole around the cable, conduit or trunking to the standard of the original wall or floor including any fire resistant/retardant properties. 527.2.1 * Switch lines must be marked brown at their terminations 514.3.1 , p343 * Telecommunication cables and power cables must not be run together. 528.2 * Main bonding conductors should not be supported by the service pipes they are connected to. 543.3.1 * Single core armoured cables must not be used in an a.c. circuit. 521.5.2 * Meter tails are part of the consumers installation and are to be provided by the installer. Meter tails must be sheathed and insulated or if insulated only must be enclosed in trunking or conduit. Meter tails must be 25mm. Where the meter tails are protected against fault current by the main fuse the installation method, maximum length and minimum cross sectional area must meet the distributors requirements. OSG p17 * Electricity cables must be spaced at least 25mm away from gas pipes up to 35mm and 50mm away from gas pipes over 35mm unless the pipes are PVC wrapped or a pane of insulating material is separating them. OSG p18 * PVC cables must be kept separated from expanded polystyrene materials. OSG p107 *

[amberleaf]

“ Extractor Fans “ Extractor fans must be provided with an easily accessible means of switching off the supply 132.15.2 * Electrical Equipment that may cause injury during mechanical maintenance i.e. fans, must be provided with a means to switch off the supply. 537.3.1.1 * All items of current using Equipment must be provided with a functional switching device. 537.5.1.3 * All Electrical Equipment must be accessible for operation, inspection & testing, maintenance and repair. 132.12 *
“ Immersion Heaters “ Extractor Fans An immersion heater must not be supplied by a ring final circuit. p362, 433.1.5 * An immersion heater must be connected to the supply by a double pole linked switch only. The use of a plug top and socket outlet is not permitted. 554.3.3 * An immersion heater must be provided with a thermal cut-out to prevent the water from boiling if the thermostat fails. 554.2.1 * All final circuits must be wired separately from all other final circuits. 314.4 * All Electrical Equipment must be accessible for operation, inspection & testing maintenance and repair. 132.12 *
The R1+R2 test sequence for radial final circuits Securely isolate the supply : Disconnect any bonding connections that could affect the test readings. : Make a temporary connection at the CCU between the phase and cpc of the circuit to be tested :. Using a low ohms continuity test meter measure the resistance between phase and cpc at each point on the circuit also confirming polarity. : The R1+R2 is the reading taken at the furthest point on the circuit. : Re-connect any bonding conductors disconnected for the test. : Remove the temporary connection at the CCU : .

“ Neutral Conductors “
In a TN-S or TN-C-S system the neutral conductor is not required to be switched or isolated when it is known that the supply neutral and earth conductors are connected. 537.1.2 ,537.2.1.1 * 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 * Only a linked circuit breaker that breaks all related line conductors can be used with an earthed Neutral conductor. 132.14.2 * It is assumed that where an installation is supplied in accordance with the Electricity Safety, Quality and Continuity Regulations 2002 the connection between the supply neutral and earth is permanent. 114.1 * The neutral conductor is considered to be a live conductor. * A neutral conductor must not be disconnected before a line conductor and must be reconnected before or at the same time as a line conductor. 431.3 * An Neutral conductor must not be independently fused or switched. 530.3.2 The conductors of a 230v circuit installed within a ferromagnetic enclosure must be arranged so that the phase conductor, neutral conductor and the appropriate cpc of each circuit are contained in the same enclosure. 521.5.2

“ Disconnection Times” under fault 230v final circuits in a TN systems not rated greater than 32A must disconnect within 0.4 seconds conditions. 411.3.2.2 * 230v final circuits in a TT systems not rated greater than 32A must disconnect within 0.2 seconds under fault conditions.If disconnection is made by a fuse or mcb and all extraneous conductive parts are connected to the main equipotential bonding then a disconnection time of 0.4 seconds is permitted. 411.3.2.2 * Under fault conditions in a TN systems circuits over 32A including distribution circuits must disconnect within 5 seconds. 411.3.2.3 * Under fault conditions in a TT systems circuits over 32A including distribution circuits must disconnect within 1 second. 411.3.2.4 *
all 17th stuff

“ Shower Circuits “ All items of current using equipment must be provided with a functional switching device. 537.5.1.3 * Electric showers are not to be installed in zone 0. 701.55 * All circuits in a bath or shower room must be protected by a 30ma RCD. p166 , 701.411.3.3 * All final circuits must be wired separately from all other final circuits. 314.4 * All electrical equipment must be accessible for operation, inspection & testing , maintenance and repair. 132.12 *

“ Lighting Circuits “ Where an installation has only one lighting circuit, the circuit may need to be divided into two circuits to minimize the danger that may arise in the event of a fault. 314.1 (iii) This is a !! Requirment !! for Domestic ← part , P, 17th *

“ Connections & Terminations “ Connections must not be subject to any mechanical stress or strain. 526.6 , 530.4.1 * All screw connections must be accessible 526.3 Through crimp connections do not have to be accessible. 526.3 * Stranded cables ends must be fitted with appropriate terminals or suitably treated. 526.8.1 * Every termination, connection or joint between live conductors including the Neutral Conductor must be made in a suitable Accessory or enclosure. 421.7, 526.5 * Live parts must be contained inside enclosures or behind barriers providing a degree of protection of at least IP2X or IPXXB . 416.2.1 * Switch Lines must be marked brown at their terminations. 514.3.1, p343 * A Neutral Conductor must not be disconnected before a line conductor and must be reconnected before or at the same time as a line conductor. 431.3 *

[amberleaf]

“ Cooker Circuits “ Unless specifically labelled or suitably identified, all 13A socket outlets must be 30ma RCD protected. 411.3.3 * All final circuits must be wired separately from all other final circuits. 314.4 * All items of current using equipment must be provided with a functional switching device. 537.5.1.3 * The Building Regulations require that accessories should not be mounted so that it is necessary to lean or reach over a cooker to operate them. * All electrical equipment must be accessible for operation, inspection & testing, maintenance and repair. 132.12 * Socket outlets must be spaced at least 150mm away from gas pipes unless there is a pane of non combustible insulating material separating them. OSG p18 * Cooker circuits rated between 16A and 50A may supply two or more cooking appliances installed in the same room. The cooker switch should be installed within 2m adjacent to the appliance(s). One cooker switch can be used to control more than one appliance. OSG p160 *
the R1 + R2 test Sequence for radial final circuits * Securely isolate the supply . Disconnect any bonding connections that could affect the test readings . Make a temporary connection at the CCU between the phase and cpc of the circuit to be tested. Using a low ohms continuity test meter measure the resistance between phase and cpc at each point on the circuit also confirming polarity. The R1+R2 is the reading taken at the furthest point on the circuit . Re-connect any bonding conductors disconnected for the test . Remove the temporary connection at the ccu .

“ Accessibility “ All electrical equipment must be accessible for operation, inspection & testing , maintenance and repair. 132.12 * All screw connections must be accessible. 526.3 Through crimp connections do not have to be accessible. 526.3 * “ Accessories “ All electrical equipment must be accessible for operation, inspection & testing , maintenance and repair. 132.12 * An accessory is an item of electrical equipment that does not use any current eg a switch or a socket-outlet. p20 * Every termination, connection or joint between live conductors including the neutral conductor must be made in a suitable accessory or enclosure. 421.7 , 526.5 * All accessories must be fitted to an appropriate mounting box. 530.4.2 * A wall mounted socket outlet must be mounted high enough above a floor or work surface to prevent damage to the flexible cord of a plug top. 553.1.6 * Unless specifically labelled or suitably identified, all 13A socket outlets must be 30ma RCD protected. 411.3.3 *
BS-7671 does not give specific heights for accessories. * “ part P “ The Building Regulations require the following : * accessories must be mounted between 450mm and 1200mm from the finished floor level in habitable rooms in new dwellings * the centre of a socket outlet should be a minimum of 150mm above the kitchen work surface * accessories must be installed a minimum of 300mm from the edge of cooker spaces, kitchen sinks and draining boards * accessories should not be mounted so that it is necessary to lean or reach over a cooker to operate them * accessories should be mounted on the building fabric and not on kitchen furniture * socket-outlets supplying washing machines and dishwashers should be installed so that water that may drip from plumbing equipment is unlikely to affect the socket-outlet or plug top *

“ Basic & Fault Protection “ Basic Protection is protection against electric shock under normal operating conditions. , p20 * Fault Protection is protection against electric shock with regard to a failure of basic insulation, p24 * Exposed conductive parts of less than 50mm2 are exempt from fault protection. 410.3.9 *