BUILDING CONSTRUCTION HANDBOOK PDF

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Building Construction Handbook Pdf

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Library of Congress Cataloging-in-Publication Data. Building design and construction handbook / Frederick S. Merritt, editor,. Jonathan T. Ricketts, editor. Download Building Construction Handbook By Roy Chudley And Roger Greeno – The Building Construction Handbook originated in as a series of four. BUILDING CONSTRUCTION HANDBOOK The Building Construction Handbook is THE authoritative reference for all construction students and professionals.

The position and depth of underground cables given by electricity suppliers must be treated as being only approximate, because historical records show only the data regarding the condition as laid, and since then changes in site levels may have taken place. When excavating in the locality of an underground cable extreme caution must be taken, which may even involve careful hand excavation to expose the cable.

Exposed cables should be adequately supported, and suitable barriers with warning notices should be erected.

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Any damage, however minor, must be reported to the electricity supplier for the necessary remedial action. It is worth noting that if a contractor damages an underground electric cable that was known to be present, and possibly caused a loss of supply to surrounding properties, the contractor can be liable for negligence, trespass to goods and damages.

These impose duties and expectations on employers, employees and the self-employed, for health and safety responsibilities with regard to the use of electricity. Risk assessment and suitable precautions relating to particular hazards, such as overhead lines and underground cables encountered on site, are contained by the Health and Safety at Work etc.

Section details provision for temporary installations and installations on construction sites. See also, BS 24 Advanced Construction Technology Code of practice for distribution of electricity on construction and building sites. The supply distribution assemblies used in the installation should comply with the recommendations of BS Specification for distribution assemblies for reduced low voltage electricity supplies for construction and building sites.

This covers the equipment suitable for the control and distribution of electricity from a three-phase four-wire a. BS EN -2 specifies plugs, socket outlets and cable couplers for the varying voltages recommended for use on construction sites. The appliances and wiring used in temporary installations on construction sites may be subject to extreme abuse and adverse conditions: therefore correct circuit protection, earthing and frequent inspection are most important, and this work, including the initial installation, should be entrusted to a qualified electrician or to a specialist electrical contractor.

Electrical distribution cables contain three line wires and one neutral, which can give either a V three-phase supply or a V single-phase supply.

Records of accidents involving electricity show that the highest risk is encountered when electrical power is used in wet or damp conditions, which are often present on construction sites.

It is therefore generally recommended that wherever possible the distribution voltage on building sites should be V. This is a compromise between safety and efficiency, but it cannot be overstressed that a supply of this voltage can still be dangerous and lethal.

[PDF] Building Construction Handbook By Roy Chudley And Roger Greeno Book Free Download

The recommended voltages for use on construction sites are given below: Mains voltage V three-phase: n n supply to transformer unit, heavy plant such as cranes and movable plant fed via a trailing cable; hoists and plant powered by electric motors in excess of a 3. Reduced voltage V three-phase: n n portable and hand-held tools; small mobile plant up to 3.

It is worth considering the use of 50 or 25 V battery-supplied hand-lamps if damp situations are present on site. All supply cables must be earthed, and in particular V supplies should be centre-point earthed so that the nominal voltage to earth is not more than 65 V on a three-phase circuit and not more than 55 V on a single-phase circuit.

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Protection to a circuit can be given by using bridge fuses, cartridge fuses and circuit breakers. Adequate protection should be given to all main and sub circuits against any short-circuit current, overload current and earth faults.

Protection through earthing may be attained in two distinct ways: n n Provision of a path of low impedence to ensure over-current device will operate in a short space of time. Insertion in the supply of a circuit-breaker with an operating coil that trips the breaker when the current due to earth leakage exceeds a predetermined value.

BS and BS EN recommend that plug and socket outlets are identified by a colour coding as an additional safety precaution to prevent incorrect connections being made. Main distribution assembly MDA Control and distribution of mains supply for circuits of V three-phase and V single-phase. Socket outlet assembly SOA Connection, protection and distribution of final subcircuits at a voltage lower than the incoming supply.

Extension outlet assembly EOA Similar to outlet assembly except that outlets are not protected. A very-low-voltage current passes along these conductors between the portable plant and the fixed EMU. A failure of the earth continuity conductor will interrupt the current flow, which will be detected by the EMU, and this device will automatically isolate the main circuit.

The cubicles or units must be of robust construction, strong, durable, rain resistant and rigid to resist any damage that could be caused by transportation, site handling or impact shocks likely to be encountered on a construction site.

All access doors or panels must have adequate weather seals. The routeing of the supply and distribution cables around the construction site should be carefully planned. Cables should not be allowed to trail along the ground unless suitably encased in a tube or conduit, and even this method should be used only for short periods of time.

Recommended minimum height clearances for overhead cables are: n n 5. Cables that are likely to be in position for a long time, such as the supply to a crane, should preferably be sited underground at a minimum depth of mm and protected by tiles, or alternatively housed in clayware or similar pipes.

In the interest of safety, and to enable first-aid treatment to be given in cases of accident, all contractors using a supply of electricity on a construction site for any purpose must display, in a prominent position, extracts from the Electricity at Work Regulations. Your Comments About This Post.

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Full Name Comment goes here. Are you sure you want to Yes No. Be the first to like this. No Downloads. Views Total views. Actions Shares. Embeds 0 No embeds. No notes for slide. Book details Author: Roy Chudley Pages: Routledge Language: English ISBN Degree level.

Table of Contents

If you want to download this book, click link in the last page 6.Extensive coverage of building construction practice, techniques, and regulations representing both traditional procedures and modern developments are included to provide the most comprehensive and easy to understand guide to building construction.

Reinforcement storage The bars are to be delivered cut to length, bent and labelled, and will be stored in racks as described above for timber storage. Get New Updates Email Alerts Enter your email address to subscribe to this blog and receive notifications of new posts by email.

Plan size to be allocated Electrical distribution cables contain three line wires and one neutral, which can give either a V three-phase supply or a V single-phase supply. About Welcome to EasyEngineering, One of the trusted educational blog.

Domestic Services Index. Name, address and telephone number of the building owner or their agent, and of the main contractor.