KEEPING TO CODEcomparison between

US & China standards

Jeffrey Lam RCDD

Data Center StandardsComparison between

EIA/TIA 942 & GB 50174 -2008

ANSI / TIA 942 Telecommunications Infrastructure Standard for Data Centers

Published by Telecommunications Industry Association

Recognised by American National Standards Institue

Published in 2005

GB 50174 (2008)Code for Design of Electronic Information System Room

Published by China Electronics Engineering Design Institute

Designated as Guo Biao ( 国标） or National Standards

Published in 2008

US vs China “National” standards

ANSI / TIA 942A Tiering system

• Tier 1 Basic Data Center• Tier 2 Redundant Components• Tier 3 Concurrently maintainable• Tier 4 Fault tolerant

GB 50174 (2008)Class system

• C Basic model • B Redundant • A Fault-tolerant-type

Classification of DC for comparison

Where items are not explicably allowed / restricted, the following terms are used in the standards

ANSI / TIA 942A Not recommendedNo requirementNo restrictionNot applicableMinimum code requirements

Classification of DC for comparison

GB 50174 (2008) 可 － permissable/ optional 应 － should be used 宜 － advisable

Comparison - LocationsTIATIER Proximity to airports GB

CLASSTIER 1

not applicable GB Class CTIER 2TIER 3 Not less than 1.6 km. GB Class BTIER 4 Not less than 8 km GB Class A

       TIATIER Proximity to major traffic arteries GB

CLASSTIER 1

not applicable GB Class CTIER 2

TIER 3 Not less than 91 m Not less than 100 m GB Class B

TIER 4 Not less than 800 m GB Class A

Comparison - Locations

TIATIER

Proximity to flood hazard area as mapped on afederal Flood Hazard Boundary or Flood

Insurance Rate Map

GBCLASS

TIER 1 No requirement Not advisable to located Class C

TIER 2 not within flood hazard area

Should not be located

Class B

TIER 3Not within 100-year flood hazard area or less than 91 m / 100 yards

from 50-year flood hazard area Class A

TIER 4 Not less the 91 m from 100-year flood hazard area

Comparison - Power

ANSI/TIA TIERS Utility Entrance GB

CLASSESTIER 1

Single Feed Class CTIER 2TIER 3 Dual feeds Dual feeds from

different sources.

Class B

TIER 4 Dual feeds from diff. substations  Class A

Comparison - Genset

TIA TIERS Back-up diesel generator system GB

CLASSES  not mentioned Class C

TIER 1 8 hrs  TIER 2 24 hrs Class BTIER 3 72 hrs Class ATIER 4 96 hrs  

Comparison – UPS

ANSI/TIA

TIERSUPS Redundancy

GB CLASSE

STIER 1

N Class CTIER 2TIER 3 N+1    

    N+X Class B

TIER 4 2N    

    2N or M(N+1) Class A

Comparison – CRAC/CRAH

ANSI/TIA TIERS CRAC / CRAH GB

CLASSESTIER 1 No redundant Unit N Class C

TIER 2 1 redundant Unit per critical area N+1 Class B

TIER 3 Redundancy to maintain continunity during loss of

one source of power

   

TIER 4 N+X Class A