Re-take - Useful Information for 2394 :

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Section 701. refer basic’s :icon_bs:

701.1. Scope .

This particular requirements of this section apply to the electrical installations in locations containing a fixed bath (bath tub, birthing pool ) or shower and to the surrounding zones as described in these regulations .

Summary of requirements
701 . Due to the presence of water, locations containing a bath or shower are onerous for equipment and there is an increased danger of electric shock .

• The additional requirements can be summarised as follows:

701.411.3.3. all low-voltage circuits serving location must be protected by 30mA RCDs .
701.411.3.3. all low-voltage circuits passing through zones 1 & 2 but not serving the location .

701.411.3.3. Additional protection by RCDs
Additional protection by the use of one or more RCDs having the characteristics specified in Regulation 415.1.1. shall be provided for low voltage circuits :

(i) serving the location .
(ii) passing through zone 1 and / or 2 not serving the location .

Note: See regulation 314.1. (iv) and 531.2.4. concerning the avoidance of unwanted tripping .

• Socket-outlets, e.g. BS-1363, are not allowed within 3 metres of zone 1 ( the edge of the bath or shower basin )
701.512.3.
Except for SELV socket-outlets complying with Section 414 and shaver supply units complying with BS-EN-61558-2-5.
socket-outlets are prohibited within a distance of 3m horizontally from the boundary of zone 1

• protection against ingress of water is specified for equipment within the zones . 0 , 1 , 2 .
701.512.2. External influences .
(i) In zone 0 : IPX7
(ii) In zone 1 and 2 : IPX4

This requirement does not apply to shaver supply units complying with BS-EN-61558-2-5. installed in zone 2 and located where direct spray from showers is unlikely .

Electrical equipment exposed to water jets. e.g. for cleaning purposes, shall have a degree of protection of at least IPX5 .

• there are restrictions as to where appliances, switchgear and wiring accessories may be installed.
701.512.3.
Erection of switchgear, controlgear and accessories according to external influences

The following requirements do not apply to switches and controls which are incorporated in fixed current-using equipment suitable for use in the zone or to insulating pull cords of cord operated switches .

701.512.3.
zone 0 .. switchgear or accessories shall not be installed . ( 0 is the plug hole )
zone 1
zone 2

701.55. Current-using equipment .
In zone 1 , only the following fixed and permanently connected current-using equipment shall be installed, provided it is suitable for installation in zone 1 according to the manufactures instructions :

- Whirlpool units
- Electric showers
- Shower pumps
- Equipment protected by SELV or PELV at a nominal voltage not exceeding 25V a.c. rms or 60V ripple-free d.c. the safety source being installed out zone 0 , 1 and 2 .
- Ventilation equipment
- Towel rails
- Water heating appliance(s)
- Luminaire(s)

 

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Certification and Reporting . :icon_bs:

(( Wording )) competent person in respect off

(A3 - 2015)
Notes : on completion of the Minor Electrical Installation Work Certificate . ( MEIWC)

Part 4 - Declaration . :deal:

Regulation 631.4.
This Certificate must be made out and signed by a competent person in respect of the design, construction, inspection and testing of the work .

Regulation 631.4
Minor Electrical Installation Work Certificate shall be compiled and signed or otherwise authenticated by skilled persons (( competent to verify that the requirements of the standard have been met )

And
Electrical Installation Certificates
Electrical Installation Condition Reports

 

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What it Means ? :icon_bs:

Amendment 3 also puts more responsibility on the Electrician.

701.411.3.3.
Bathrooms - There is already a requirement for all low-voltage circuits in a bathroom to be 30mA RCD protected.
There is now a (( (ii) - New provision requiring low voltage circuits passing through Zones 1 and 2 of a bathroom to be 30mA RCD protected ))

 

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BS-7671:2008:2011(2015) :icon_bs:

Note : In order not to mix regulations on different subjects, such as those for electrical installation of caravan parks with those for electrical installation inside caravans, two section have been created :

► Section 708, which concerns electrical installation in caravan parks, camping parks and similar locations .
► Section 721, which concerns electrical installation in caravans and motor caravans . (( caravan internal wiring section ))

P/273 . Table 721 - Minimum cross sectional area of flexible cables for caravan connection .

Q) The minimum cross sectional area for a cable carrying up to 25A in a caravan shall be :
2.5mm[SUP]2[/SUP]
4.0mm[SUP]2[/SUP]
6.0mm[SUP]2[/SUP]
16mm[SUP]2 [/SUP]

 

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Only be treated as an aide-mémoire to the Regulations and Electricians should always consult BS-7671:2015: to satisfy compliance . :icon_bs:

Ingress protection [ IP ] external influences :book:

Regulation 512.2. requires that equipment is suitable for the external influence to which is will be subjected when installed.
A large “ Matrix ” type table of external influences with letter designations is included in Appendix 5 of BS-7671:2015, running to 13 pages

The influence of objects and water are the main criteria that needs to be considered .

BS-EN-60529:1992+A2:2013 Specification for degree of protection provided by enclosures ( IP code )
Standard by British-adopted European Standard . EN-60529:1992+A2:2013

The European Standard BS-EN-60529. Degree of protection provided by enclosures ( IP code ) is a “ Standards for Standards” document and provides information about the degree of protection that can be expected of equipment, when allocated with a particular IP code .

The arrangement of the [ IP ] code is made up of four characters, some of which are optional. The arrangement of the code is as follows .

IP - International protection . ( IP ) ( 6 ) ( 7 ) ( H ) ( C ) etc

( 6 ) 1[SUP]st[/SUP] Number protection against solid objects 0 to 6 or X .
( 7 ) 2[SUP]nd[/SUP] Number protection against water 0 to 8 or X .
( H ) 3[SUP]rd[/SUP] Letter-optional access to live parts A, B, C, and D .
( C ) 4[SUP]th[/SUP] Letter-optional supplementary information H, M, S, W .

The protection levels can be understood and these are often only specified using the first two characters , as follows:

1[SUP]st[/SUP] Numeral Solid Objects . ( IP67 ) 6 Dust tight . 2[SUP]nd[/SUP] Numeral water 7 Temporary immersion . ( 6/7 ) IP67 .

0 No protection
1 Drips vertical
2 Drip 15 degrees
3 Spraying
4 Splashing
5 Jets
6 Powerful jets
7 Temporary immersion
8 Continuous immersion

Optional Characters - 3[SUP]rd[/SUP] Character
A back of hand
B finger
C tool
D wire

( Sample IP67 AH ) IP67 AH . Back of hand & High voltage apparatus .

4[SUP]th[/SUP] Character
H High voltage apparatus
M Motion during water test
S Stationary during water test
W Weather conditions

Equipment applications and examples .
Sometimes, particularly in specifications, one of the first or second characters is not specified and an X is used . e.g. IP2X .

Perhaps a little more confusing is where the two designations are used for water . Generally the higher the numerals of the ( IP code ) the higher the protection level. This is not true where jets of water are concerned. Equipment to IPX8, for example, is totally immersible in water, but may not necessary be suitable for jets ( IPX5 ) or high-pressure jets ( IPX6 ) Equipment that is suitable for both environments will thus require a dual marking of ( IPX6 / IPX8 ) meaning protection against powerful jets and immersion .

Water jets and immersion ( Enclosure passes tests for )
Water jets 2[SUP]nd[/SUP] characteristic numeral (5) Temporary or continuous immersion 2[SUP]nd[/SUP] characteristic (7) [ designation and marking IPX5/IPX7 ]
Water jets 2[SUP]nd[/SUP] characteristic numeral (6) Temporary or continuous immersion 2[SUP]nd[/SUP] characteristic (7) [ designation and marking IPX6/IPX7 ]
Water jets 2[SUP]nd[/SUP] characteristic numeral (5) Temporary or continuous immersion 2[SUP]nd[/SUP] characteristic (8) [ designation and marking IPX5/IPX8 ]
Water jets 2[SUP]nd[/SUP] characteristic numeral (6) Temporary or continuous immersion 2[SUP]nd[/SUP] characteristic (8) [ designation and marking IPX6/IPX8 ]
Water jets 2[SUP]nd[/SUP] characteristic numeral (-) Temporary or continuous immersion 2[SUP]nd[/SUP] characteristic (7) [ designation and marking IPX7 ]
Water jets 2[SUP]nd[/SUP] characteristic numeral (-) Temporary or continuous immersion 2[SUP]nd[/SUP] characteristic (8) [ designation and marking IPX8 ]

 

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IP Ratings: (Ingress Protection or International Protection)

 

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BS-EN-62262::2002.
2015: P/311. 708.512.2. (iii) 709.512.2.1.4. (iii)

Degrees of protection provided by enclosures for electrical equipment against external mechanical impacts ( IK code )

P/231. 708.512.2. External influences :icon_bs:
(iii) Mechanical stress: AG3 (high severity ) , IK08 in accordance with BS-EN-62262.

P/235. 709.512.2.1.4. Impact (AG) :icon_bs:
Equipment installed on or above a jetty, wharf, pier or pontoon shall be protected against mechanical damage ( impact of medium severity AG2) Protection shall be afforded by one or more of the following:
(iii) Installing equipment complying with a minimum degree of protection for external mechanical impact IK08 .. ( see BS-EN-62262)

(( Only be treated as an aide-mémoire to the Regulations and Electricians should always consult BS-7671:2015: to satisfy compliance ))

EN-62262 and BS-EN-62262 .

(Impact Protection)

IK ratings are defined as IKXX, where "XX" is a number from 00 to 10 indicating the degrees of protection provided by enclosures (including luminaires) against external mechanical impacts. The different IK ratings relate to the ability of an enclosure to resist impact energy levels measured in joules (J). IEC 62262 specifies how the enclosure must be mounted for testing, the atmospheric conditions required, the quantity and distribution of the test impacts and the impact hammer to be used for each level of IK rating.

Degrees’ of protection against external mechanical impact’s
IK00 non protected
IK01 0.14 J
IK02 0.2 J
IK03 0.35 J
IK04 0.5 J
IK05 0.7 J
IK06 1 J
IK07 2 J
IK08 5 J your answer
IK09 10 J
IK10 20 J

 

[Richard Burns]

For Amberleaf

Re: Regulation . 521.10.1.
The Note to Regulation 521.10.1 requires that, if a system includes site-fabricated joints, the installer must confirm the completed item meets at least the degree of protection IPXXD.
Just for a reference example:
The Answer to the regulation


BS7671: 2008 – Amendment No. 1: 2011 came into force for all new designs on January 1st, 2012 and Section 521.10.1 stipulates the need for trunking to deliver IPXXD or IP4X protection when used with single insulated (non-sheathed) cables – something that standard IP30 rated systems do not deliver.


IP4X distribution trunking is currently the only system that meets the IP4X requirements of the amendment to the 17th Edition Wiring Regulations. This has been achieved through the introduction of a cover strap, which is simply connected to each coupler over the joint between the two lids, and a new range of IP4X fittings that integrate fully with existing lengths and accessories to deliver a fully compliant solution.

As with the standard trunking, IP4X trunking has been designed with speed of installation in mind.
For IP4X protection, simply clip a ‘cover strap‘ to each coupler over the joint between two lids

IP4X fittings should be specified to achieve the correct level of conformity

 

[Richard Burns]

For Amberleaf

Basic Theory

 

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Only be treated as an aide-mémoire to the Regulations and Electricians should always consult BS-7671:2015: to satisfy compliance.

Learning curve only .

P/400 . Appendix 5 ( informative ) :icon_bs:
Classification of External Influences’ .

If several external influences appear at the same time ! they can have independent or mutual effects and the degree of protection must be chosen accordingly .

Condition of external influence is designated by a code comprising a group of ( Two-capital letters ) and ( Numbers ) as flows :

First letter ( A, B, or C )
first letter relates to the general category of external influence :
A = Environment
B = Utilisation
C = Construction of buildings

Second letter

Second letter relates to the nature of the external influence.


Number
The number relates to the class within each external influence.


Additional letter (optional)
Used only if the effective protection of persons is greater than that indicated by the first IP digit.
When only the protection of persons is to be specified, the two digits of the IP code are replaced by the X’s.


Example: IPXXB.


Example P/405 . (A ) Environment , cont.


For example the code AC2 signifies:
P/400 . A = Environment
P/405 . AC = Environment-altitude
P/405 . AC2 = Environment-altitude > 2.000 m

P/401 . Appendix 5 ( informative )

List of External Influence(s) which should be referred to if further details are required .
Code: External influences : Characteristics’ required for equipment :

A - Environment .
P/402 . AA Ambient temperature (°C)
Low High Specially designed equipment or appropriate arrangements
AA1 - 60°C + 5°C
AA2 - 40°C + 5°C
AA3 - 25°C + 5°C
AA4 - 5°C + 40°C Normal ( special precautions in certain cases)
AA5 - 5°C + 40°C Normal .
AA6 + 5°C + 60°C Specially designed equipment or appropriate arrangements
AA7 - 25°C + 55°C
AA8 - 50°C + 40°C

 

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Only be treated as an aide-mémoire to the Regulations and Electricians should always consult BS-7671:2015: to satisfy compliance.

Appendix 5

Classification of external influences P/400


defined as .
P/28 . External influence . Any influence external to an electrical installation which affects the design and safe operation of that installation.

These external influences are shown by the use of a code which has two capital letters and a number

The first letter shows the category of external influence.

The second letter shows what the external influence relates to and the number indicates the level of the external influence.
The first letter indicates which category the external influence falls under .

A . = Environment - ( wet . dry . vibration )
B . = Utilisation :
• How is the building being used .
• What is the capability of the persons using the building .
• Are they ordinary persons or persons are they handicapped .
C . = Construction of buildings . What is the building constructed from : Non-combustible . Combustible .

The second letter indicates what the external influence could be .
refer to appendix 5 and look in environment section ( category A )

example : if the second letter was K it would refer to; presence of flora ( and/or mould growth )
The last digit is a number and indicates the level of protection which the external influence is likely to be .

External influence given a code of ( AD1)
- Letter (A) relates to the environment .
- Letter (D) relates to water ... AD presence of water .
- Final digit (1) tells you that the problem likely to be caused by water is negligible . ( AD1)

Example: external influence given a code of (AD1)
you can see the letter (A) relates to the environment .

you can see the letter (D) relates to water .

first digit (1) tell you that the problem likely to be caused by water is negligible . (AD1)

you need to look further into Appendix 5 . When you find (AD1) you can see that it relates to areas where weather protection is not required and that the (IP rating ) for the equipment is ( IPX0) As the external influence relates to water nothing is specified for dust (X) and the level of protection against water is (0) which means no protection required .

At the other end of the scale , you can see that (AD8) is where the equipment is likely to be totally submersed, ( such as in a swimming pool )

The ( IP rating ) given as protection is (IPX8) shows that nothing is specified for dust and 8 shows that it must be protection against the effects of continuous immersion in water .

THE INDEX OF PROTECTION CODES IS USED THROUGHOUT BS-7671:2008:2011:2015: to identify the minimum level of protection permissible .

P/405 : A Environment (cont.)
Code External influences : Characteristics required for selection and erection of equipment : Reference for information only .

AD Presence of water
AD1 Negligible
IPX0 Outdoor and non-weather protected locations, with low and high temperatures .

AD2 Free-falling drops
1PX1 or IPX2 Location in which water vapour occasionally condenses as drops or where stream may occasionally be present .

AD3 Sprays
IPX3 Location in which sprayed water forms a continuous film on floor and/or walls .

AD4 Splashes
IPX4 Locations where equipment may be subjected to splashed water; this applies, for example, to certain external luminaires, construction site equipment

AD5 Jets
IPX5 Locations where hose water is used regularly ( yards, car-washing bays )

AD6 Waves
IPX6 Seashore locations such as piers, beaches, quays, etc.

AD7 Immersion
IPX7 Locations which may be flooded and/or where water may be at maximum 150mm above the highest point of equipment, the lowest part of equipment being not more than 1m below the water surface .

AD8 Submersion
IPX8 Locations such as swimming pools where electrical equipment is permanently and totally covered with water under a pressure greater than 0.1 bar .

External influences :


Regulation 301.1. and more particularly Chapter 32 and Appendix 5 of BS-7671: deal with external influences which needs to be assessed by the designer and taken into account in the subsequent installation design and construction .

(ii) The external influences to which it is to be Exposed ( Chapter 32 )

 

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Only be treated as an aide-mémoire to the Regulations and Electricians should always consult BS-7671:2015: to satisfy compliance.

Protection by barriers or enclosures

416.2.
The term enclosure is readily understood as being a construction which prevents live parts being touched. Barriers are, because of the common English usage, sometimes confused with Obstacles .

A barrier in the sense of the regulations is similar to an enclosure in that it is a part providing a defined degree of protection against contact with live parts, with the difference that the protection is only provided in the usual direction of access.

An enclosure provides protection in any direction .
A barrier may not have protection against contact from above.

The basic-requirement for IP2X is that the live part should be inaccessible to a finger .
The basic-requirement of IP4X is that it should be inaccessible to a wire .

As the regulations state. The higher degree of protection is required on Top of an Enclosure to prevent small items falling through .

In general, barrier(s) or enclosure(s) should only be able to be removed or opened by the use of a Key or Tool .

IP ? X
First characteristic :
Numeral

Against ingress of solid foreign objects 2 > 12.5mm diameter
Against access to hazardous parts with non-protected finger

Against ingress of solid foreign objects 4 > 1.0mm diameter
Against access to hazardous parts with non-protected wire

 

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Avoiding damage to Cables due to condensation or ingress of water .

like any other part of the wiring system, cables are subject to Regulation 522.3.1. which requires that : :icon_bs:
“ A wiring system shall be selected and erected so that no damage is caused by condensation or the ingress of water during installation ” use or maintenance

Regulation 522.3.1 ... The completed wiring system shall comply with the IP degree of protection relevant to the particular location.

Note: Special considerations apply to wiring system liable to frequent splashing, immersion or submersion .

 

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RCD Protected Switch socket Outlet

( What’s in a name ! a big difference ) ... Active or Passive RCDs :30:

Active control circuits Incorporate a ‘Re-set’ mechanism and are mains failure sensitive, i.e. they will function under all the normal conditions expected of an RCD, but will also trip in the event of a power cut or a sudden, dramatic reduction in mains voltage.

Passive control circuits Incorporate a ‘Stay-set’ mechanism and is mains failure proof, i.e. it will function under all the normal conditions expected of an RCD and will not trip in the event of a power cut.

 

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A list of (( External influences )) and their characteristics have been included as an appendix ( i.e. Appendix 5 ) to BS-7671:2008:2011:2015: :icon_bs:
What the regulations are stating. The following notes concerning external influences are offered as Guidance.

132.5. Environment conditions
132.5.1. The design of the electrical installation shall take into account the environmental conditions to which it will be subjected .

re-cap . ↑
[ Equipment likely to be exposed to weather, corrosive atmospheres or other adverse conditions shall be so constructed or protected as may be necessary to prevent danger arising from such exposure. ]

512.2. External influences Etc.
512.2.2. Equipment shall be of a design appropriate to the situation in which it is to be used or it’s mode of installation shall take account of the conditions likely to be encountered .

530.3. requirements from the regulations . General; External Influences
Equipment shall be selected and installed to provide for the safety and proper functioning for the intended use of the installation. Equipment installed shall be appropriate to the (( external influences foreseen ))