IEE WIRING REGULATIONS 16TH EDITION PDF

adminComment(0)
    Contents:

The current sixteenth edition of the IEE Wiring Regulations, also known as BS , to which this book conforms, was published in June The philosophy . 16th Edition IEE Wiring Regulations Explained and Illustrated By the same author Electrical Installation Work Wiring 3MB Size Report. DOWNLOAD PDF. We will show in this book that drawing the human body need not be so difficult. in interpretive point of view, it allo The 5 Second Rule: Transform your Life.


Iee Wiring Regulations 16th Edition Pdf

Author:ASUNCION FREYER
Language:English, Portuguese, Japanese
Country:Azerbaijan
Genre:Business & Career
Pages:694
Published (Last):22.12.2015
ISBN:160-1-68676-148-8
ePub File Size:21.49 MB
PDF File Size:17.21 MB
Distribution:Free* [*Registration Required]
Downloads:45999
Uploaded by: NEIDA

16th Edition IEE Wiring Regulations. Explained & Illustrated. Brian Scaddan 7th Edition. Used alongside the regulations themselves, this book is the key to safe. items With the 18th Edition of the IET Wiring Regulations come new recommendations as well as increased levels of regulation. Whether that's in the form. This book builds on the basic knowledge and techniques covered in 16th Edition IEE Wiring Regulations Explained and Illustrated, providing the information and.

Figure 14 b shows the arrangement of a three-phase RCD, and Figure 14 c , how it can be connected for use on single-phase circuits.

Nuisance tripping Certain appliances such as cookers, water heaters and freezers tend to have, by the nature of their construction and use, some leakage currents to earth.

These are quite normal, but could cause the operation of an RCD protecting an entire installation. This can be overcome by using split-load consumer units, where socket outlet circuits are protected by a 30 mA RCD, leaving all other circuits controlled by a normal mains switch. One area where the use of 30 mA RCDs is required is in the protection of socket outlets intended for the connection of portable appliances for use outside the main equipotential zone.

Hence, socket outlets in garages or even within the main premises which are likely to be used for supplying portable tools such as lawn mowers and hedge trimmers must be protected by an RCD rated at 30 mA or less.

All other equipment outside the main equipotential zone should, in the event of an earth fault, disconnect in 0. An exception to the RCD requirement is where fixed equipment is connected to the supply via a socket outlet, provided that some means of preventing the socket outlet being used for hand-held appliances is ensured.

The confusion may have arisen because of a lack of understanding of earthing and bonding. Hopefully, this chapter will rectify the 43 Earthing situation. In general the only Supplementary bonding required in a domestic premises is in a bathroom. By now we should know why bonding is necessary; the next question, however, is to what extent bonding should be carried out.

This is perhaps answered best by means of question and answer examples: 1 Q: Why do I need to bond the hot and cold taps and a metal kitchen sink together? Surely they are all joined anyway? A: In most sinks the holes for connection of the taps are usually surrounded by a plastic insert which tends to insulate the taps from the sink.

Iee wiring regulations 18th edition pdf free download:

The hot and cold taps are both parts of different systems and could originate from outside the equipotential zone. These, therefore, could be extraneous conductive parts and may need to be bonded together, although there is no specific requirement in BS to do this.

A: Supplementary bonding is only necessary when extraneous conductive parts are simultaneously accessible with exposed conductive parts and the disconnection time for the circuit concerned cannot be achieved. A: In general, no. Apart from the fact that most window frames will not introduce a potential from anywhere, the part of the window most likely to be touched is the opening portion, to which it would not be practicable to bond.

There may be a case for the bonding of patio doors, which could be considered earthy with rain running from the lower portion to the earth. However, once again the part most likely to be touched is the sliding section, to which it is not possible to bond.

In any case there would need to be another simultaneously accessible part to warrant considering any bonding. A: Bathrooms are particularly hazardous areas with regard to shock risk, as body resistance is drastically reduced when wet. Hence, supplementary bonding between exposed conductive parts must be carried out in addition to their existing CPCs. Also of course, taps and metal baths may need bonding together, and to other extraneous and exposed conductive parts.

It may be of interest to note that in older premises a toilet basin may be connected into a cast iron collar which then tees outside into a cast iron soil pipe. This arrangement will clearly introduce earth potential into the bathroom, and hence the collar should be bonded to any simultaneously accessible conductive parts. This may require an unsightly copper earth strap. However, if these bonding conductors are connected to exposed conductive parts, they must be the same size as the CPC connected to the exposed conductive part, once again subject to the minimum sizes mentioned.

A: No.

These items will not introduce a potential into the equipotential zone from outside, and cannot therefore be regarded as extraneous conductive parts. A: There is an increasing amount of plastic plumbing installations being used in modern houses for both domestic hot and cold 45 Earthing water and C.

If the pipework is plastic but terminates in copper at taps, radiators etc. The Faraday cage In one of his many experiments, Michael Faraday — placed an assistant in an open-sided cube which was then covered in a conducting material and insulated from the floor. When this cage arrangement was charged to a high voltage, the assistant found that he could move freely within it touching any of the sides, with no adverse effects.

The run is some 25 m and the external loop impedance of the TN—S system is not known. Is there a shock risk, and if so, how could it be rectified? Barrier A part providing a defined degree of protection against contact with live parts, from any usual direction. Class 2 equipment Equipment in which protection against electric shock does not rely on basic insulation only, but in which additional safety precautions such as supplementary insulation are provided.

There is no provision for the connection of exposed metalwork of the equipment to a protective conductor, and no reliance upon precautions to be taken in the fixed wiring of the installation. Circuit protective conductor A protective conductor connecting exposed conductive parts of equipment to the main earthing terminal.

Direct contact Contact of persons or livestock with live parts. Enclosure A part providing an appropriate degree of protection of equipment against certain external influences and a defined degree of protection against contact with live parts from any direction.

Exposed conductive part A conductive part of equipment which can be touched and which is not a live part but which may become live under fault conditions. External influence Any influence external to an electrical installation which affects the design and safe operation of that installation. Extraneous conductive part A conductive part liable to introduce a potential, generally earth potential, and not forming part of the electrical installation.

Fault current A current resulting from a fault.

It may be of interest to note that in older premises a toilet basin may be connected into a cast iron collar which then tees outside into a cast iron soil pipe. This arrangement will clearly introduce earth potential into the bathroom, and hence the collar should be bonded to any simultaneously accessible conductive parts.

This may require an unsightly copper earth strap. However, if these bonding conductors are connected to exposed conductive parts, they must be the same size as the CPC connected to the exposed conductive part, once again subject to the minimum sizes mentioned.

A: No. These items will not introduce a potential into the equipotential zone from outside, and cannot therefore be regarded as extraneous conductive parts. A: There is an increasing amount of plastic plumbing installations being used in modern houses for both domestic hot and cold 45 Earthing water and C. If the pipework is plastic but terminates in copper at taps, radiators etc.

The Faraday cage In one of his many experiments, Michael Faraday — placed an assistant in an open-sided cube which was then covered in a conducting material and insulated from the floor. When this cage arrangement was charged to a high voltage, the assistant found that he could move freely within it touching any of the sides, with no adverse effects.

The run is some 25 m and the external loop impedance of the TN—S system is not known. Is there a shock risk, and if so, how could it be rectified? Barrier A part providing a defined degree of protection against contact with live parts, from any usual direction.

Class 2 equipment Equipment in which protection against electric shock does not rely on basic insulation only, but in which additional safety precautions such as supplementary insulation are provided.

There is no provision for the connection of exposed metalwork of the equipment to a protective conductor, and no reliance upon precautions to be taken in the fixed wiring of the installation.

Circuit protective conductor A protective conductor connecting exposed conductive parts of equipment to the main earthing terminal.

Direct contact Contact of persons or livestock with live parts. Enclosure A part providing an appropriate degree of protection of equipment against certain external influences and a defined degree of protection against contact with live parts from any direction.

Exposed conductive part A conductive part of equipment which can be touched and which is not a live part but which may become live under fault conditions.

External influence Any influence external to an electrical installation which affects the design and safe operation of that installation. Extraneous conductive part A conductive part liable to introduce a potential, generally earth potential, and not forming part of the electrical installation.

Fault current A current resulting from a fault. Fixed equipment Equipment fastened to a support or otherwise secured in a specific location. Indirect contact Contact of persons or livestock with exposed conductive parts which have become live under fault conditions.

Isolation Cutting off an electrical installation, a circuit or an item of equipment from every source of electrical energy. Insulation Suitable non-conductive material enclosing, surrounding or supporting a conductor.

Live part A conductor or conductive part intended to be energized in normal use, including a neutral conductor but, by convention, not a PEN conductor. Obstacle A part preventing unintentional contact with live parts but not preventing deliberate contact. Overcurrent A current exceeding the rated value. For conductors the rated value is the current-carrying capacity.

Residual current device An electromechanical switching device or association of devices intended to cause the opening of the contacts when the residual current attains a given value under specified conditions.

Short-circuit current An overcurrent resulting from a fault of negligible impedance between live conductors having a difference of potential under normal operating conditions. Skilled person A person with technical knowledge or sufficient experience to enable him to avoid the dangers which electricity may create.

What is protection? People protect themselves against personal or financial loss by means of insurance and from injury or discomfort by the use of the correct protective clothing.

16th Edition IEE Wiring Regulations: Design and Verification of Electrical Installations

Let us now look at these protective measures in more detail. In fact a serious electrical overcurrent left uninterrupted for too long can cause distortion of 49 Protection conductors and degradation of insulation; both of these effects are considered to be mechanical damage. However, let us start by considering the ways of preventing mechanical damage by physical impact and the like. Cable construction A cable comprises one or more conductors each covered with an insulating material.

This insulation provides protection from shock by direct contact and prevents the passage of leakage currents between conductors. Clearly, insulation is very important and in itself should be protected from damage. This may be achieved by covering the insulated conductors with a protective sheathing during manufacture, or by enclosing them in conduit or trunking at the installation stage.

For example, metal conduit with PVC singles or mineral-insulated MI cable would be used in preference to PVC-sheathed cable clipped direct, in an industrial environment. Figure 15 shows the effect of physical impact on MI cable. Protection against corrosion Mechanical damage to cable sheaths and metalwork of wiring systems can occur through corrosion, and hence care must be taken to choose corrosion-resistant materials and to avoid contact between dissimilar metals in damp situations.

Related titles

Basically, it requires common-sense decisions regarding the placing of fixed equipment, such that surrounding materials are not at risk from damage by heat. Added to these requirements is the need to protect persons from burns by guarding parts of equipment liable to exceed temperatures listed in Table 42A of the Regulations.

On impact, all parts including the conductors are flattened, and a proportionate thickness of insulation remains between conductors, and conductors and sheath, without impairing the performance of the cable at normal working voltages Polyvinyl chloride PVC is a thermoplastic polymer widely used in electrical installation work for cable insulation, conduit and trunking.We have already seen earlier in this book that touch voltage should not exceed 50 V.

These would include locations where combustible materials are stored or could collect and where a risk of ignition exists.

Apart from the fact that most window frames will not introduce a potential from anywhere, the part of the window most likely to be touched is the opening portion, to which it would not be practicable to bond.

Circuit protective conductor A protective conductor connecting exposed conductive parts of equipment to the main earthing terminal. Figure 8 TT system 31 Earthing Figure 9 TN—S system 2 A TN—S system has the supply source neutral directly connected to earth, the installation metalwork connected to the earthed neutral of the supply source via the lead sheath of the supply cable and the neutral and protective conductors throughout the whole system performing separate functions Figure 9.

Inspection, Testing and Certification of Electrical Newnes. What is protection? This will include those trainees who will be considered as employees under the Regulations described in paragraph 1. Basically, it requires common-sense decisions regarding the placing of fixed equipment, such that surrounding materials are not at risk from damage by heat.