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| | Kevin J Article 645 is not a requirement; it is optional and rarely used. In fact most engineers and designer avoid like the plague due to the EPO requirements. 645 allows leniencies not otherwise permitted in the code and very strict requirements have to be met specified in 645.2 in order to qualify like the dreaded EPO.
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| dereckbc (2/23/2009)
Kevin J Article 645 is not a requirement; it is optional and rarely used. In fact most engineers and designer avoid like the plague due to the EPO requirements. 645 allows leniencies not otherwise permitted in the code and very strict requirements have to be met specified in 645.2 in order to qualify like the dreaded EPO. AMEN!
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| dereckbc (2/23/2009)
Kevin J Article 645 is not a requirement; it is optional and rarely used. In fact most engineers and designer avoid like the plague due to the EPO requirements. 645 allows leniencies not otherwise permitted in the code and very strict requirements have to be met specified in 645.2 in order to qualify like the dreaded EPO. Great, thanks Dereck. Can you share links on subject? Thanks, Kevin J
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| Kevin J (2/23/2009)
dereckbc (2/23/2009)
Kevin J Article 645 is not a requirement; it is optional and rarely used. In fact most engineers and designer avoid like the plague due to the EPO requirements. 645 allows leniencies not otherwise permitted in the code and very strict requirements have to be met specified in 645.2 in order to qualify like the dreaded EPO. Great, thanks Dereck. Can you share links on subject? Thanks, Kevin J You bet I can here is two articles written by a close friend and ex employee of mine who designs data centers for a very large A/E firm who specializes in data centers.645 Might Not Be RIGHT FOR YOU EPO OR NO EPO
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| In the UK and most other European countries it is a requirement under the electrical regulations to ground all extraneous metallic items. Unless we start using plastic cabinets and frames then you must ground the cabinet.
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| sbanks (2/26/2009)
In the UK and most other European countries it is a requirement under the electrical regulations to ground all extraneous metallic items. Unless we start using plastic cabinets and frames then you must ground the cabinet.Well that is certainly a requirement in the USA. But the questions/statement was: "I am being told by a P.E. that it is not an NEC code requirement to ground equipment racks, cabinets, or cable tray in a data center with a dedicated grounding system separate from the ground wire provide for equipment power. " That statement is correct, but the engineer should have qualified his statement by saying assuming the equiment has AC powered equipment in it and electically connected to the frame.
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| Hi All
Can somebody tell what is the name of BICSI data center paper and its schedule.
ADNOM Technology
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| | I want to thank everyone for the comments. Grounding and bonding is a fascinating subject but is probably the most misunderstood of all ITS topics. I am still confused on what is / is not required in the DC by NEC and offer the following questions: 1) If I build a data center with equipment racks /cabinets, cable tray and a raised floor with the intent of renting the space to co location tenants then do the metallic components need to bonded to ground if they DC does not contain AC powered equipment? 2) What about racks / cabinets that are installed to support only cabling? 3) If a fault current from an AC lighting circuit or other circuit was to energize metallic conduit, racks / cabinets, floor grid, etc without tripping a breaker and someone was killed from touching the now energized metal and if the family was to sue what would the court say in ragrds to NEC and who would be liable? |
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