- Hot search：
IEEE Std 628-2020 pdf free download
IEEE Std 628-2020 pdf free download.IEEE Standard Criteria for the Design, Installation, and Qualification of Raceway Systems for Class 1E Circuits for Nuclear Power Generating Stations.
B.1 Raceway systems
Aluminum can react with certain chemical sprays used in some containment structures and release hydrogen. which may accumulate in explosive conccntrations. The amount of aluminum raccways inside thcsc containment structures is considered an inventoried item for review. Galvanized raccways are recommended inside containment structures: however, the amount of zinc used inside the containment structure is also considered an inventoried item for review (see Regulatory Guide 1.7 lBS 1).
B.1.1 Conduit and underground duct systems
B. 1.1.1 Conduit application recommendations
The following recommendations should be considered for conduit applications:
a) Zinc-coated RMU and IMC may be exposed in wet and dry locations, embedded in noncinder concrete at least 5 cm (2 in) thick, and directly buried in soil. When used in cinder fills, it should be protected by noncinder concrete at least 5 cm thick. Where alkaline conditions exist, consideration should be given to a protective coating. Copper-silicon alloy, brass, or plastic plugs should be used to plug spare conduits in wet locations.
b) Aluminum RMC may be exposed in wet and dry locations. Because aluminum conduit may corrode in concrete, it should not be used without an external protective coating. It should not be installed in soil.
C) The top of duct banks should be located below the frost line. Duet banks should run as straight as possible with manholes and handholes used to reduce the number of bends. Bends should have the largest radius possible consistent with the duct configuration and material. Offsets in duct runs should be avoided. Manholes and handholcs should have a sump to facilitate the use ofa pump when required. Duct joints should be staggered both horizontally and vertically.
d) Hot-dip galvanized RMC should be used for installing low-level signal cables in the isolated cases where a concrete-encased duct bank contains conduits for power and low-level signal cables and additional electromagnetic shielding is required.
c) Exposed nonmetallic and protective coatings on metallic raceways require additional design considerations. Because PVC produces chlorine gas and is not self-extinguishing in a fire, reducing its exposure to free air should be considered.IEEE Std 628-2020 pdf free download.
All resources on this website are from the Internet. It is only for personal study and research. No one is allowed to use it for any commercial purpose. If you need, please buy the genuine standard. If there is any infringement of your copyright, please contact the webmaster in time, and I will correct it immediately.
- Maybe you like
- Latest Updates
- ISO 287-2009 pdf free download
- ISO 527-5-2009 pdf free download
- ISO 659-2009 pdf free download
- ISO 660-2009 pdf free download
- ISO 712-2009 pdf free download
- ISO 725-2009 pdf free download
- ISO 730-2009 pdf free download
- ISO 927-2009 pdf free download
- ISO 2041-2009 pdf free download
- ISO 3040-2009 pdf free download
- ISO 3506-2-2009 pdf free download
- ISO 3506-3-2009 pdf free download