Get ACI 121R-08: Guide for Concrete Construction Quality Systems PDF


ISBN-10: 0870312820

ISBN-13: 9780870312823

ACI Committee 121 built this guide to supply ISO 9001:2000-based caliber administration procedure specifications and assistance to the concrete building undefined. dialogue is available for every clause of the ISO 9001:2000, supplying suggestion and construction-specific info that may be used as a connection with both produce a brand new caliber administration procedure compliant with ISO 9001:2000, or to improve an ISO 9001:1994 or different caliber administration method to satisfy the ISO 9001:2000 standards. Appendix A, “Model caliber administration method handbook for Designers, building Managers, and Constructors,” is predicated at the “NYC MTA Bridges and Tunnels, Engineering and building Department,” and is usually recommended to be used as a template for any corporation starting to write a top quality handbook.

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Extra info for ACI 121R-08: Guide for Concrete Construction Quality Systems in Conformance with ISO 9001

Example text

2 If protection against indirect contact is to be provided by the residual current element of an RCBO the tabulated values of maximum earth fault loop impedance (Tables 41B2, 604B2 and 605B2) are not applicable and Regulation 413-02-16 applies. 413-02-16 Mixed disconnection times 413-02-13 The requirements for mixed disconnection times apply for any final circuits supplied from the same distribution board, distribution circuit or sub-main. This includes adjacent boards supplied from a common circuit or with a common bonding connection.

10 Earth-free local equipotential bonding 413-05 The application of this measure is strictly limited to special situations which are earth-free, and where its use is fully justified on operational grounds. e. not being Class II equipment or having equivalent insulation), will not operate satisfactorily if connected to a means of earthing. The location where the measure is applied may have a non-conducting floor, or a conductive floor which is insulated from earth and to which every accessible exposed-conductive-part within the location is connected by local equipotential bonding conductors.

542-01-03 PME sources offer a number of advantages over TN-S, among which are: — the connection with earth is more reliable not being dependent upon armouring continuity etc. — the PEN conductor, being of copper or aluminium, provides a lower impedance return path for earth fault currents than (say) steel armour or a lead sheath — use of the neutral as a combined neutral and protective conductor represents a material saving. Main equipotential bonding is an important requirement for installations supplied from TN-C-S (PME) systems, in view of the risk of danger in the event of an open circuit neutral fault on the distributor’s low voltage network.

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