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1.1-3 Certification options for power distribution equipment associated with ITE
' R- _ X/ p1 g% ]0 @ YSTANDARD IEC/UL 60950-1
# O a) T& x! b6 IAPPLICABILITY UL(C-UL) only6 w' Q9 X: a7 ^* H4 u5 c
(Sub)CLAUSE/ANNEX NUMBER: 1.1# ~+ G& |0 K8 y' H8 S
(Sub)CLAUSE/ANNEX HEADING: Scope" A& e; X' I9 J: _5 z
OTHER RELEVANT (Sub)CLAUSES/ANNEXES" \( F5 P% t4 g
(as Applicable):
' o: e4 a* c5 [+ G1.1.2, 1.6.1.2, Annex NAB+ z( T0 W8 q! M
DESCRIPTION OF ISSUE:
& T7 U( Y0 x; `1 k8 l& {Type of Issue: Certification
; p* N. h, R6 A% i t' L1 H" ?A variety of power distribution equipment associated with both a.c. and d.c. power is used with
" e. {( R% P% D5 _0 RITE, including power distribution units, computer power centers, charger/rectifiers, and primary8 {! b- L, U, U. y9 V
and secondary distribution-related equipment. What standards should be used for this" _% L: @2 a0 ^$ E H7 B
equipment, and what product categories should it be certified under?; H0 U( [6 M. E X" r
APPLICATION GUIDELINE:
' t+ I! Y# C8 d8 y( J0 b( l/ a! I4 JThe two main sets of technical requirements used to investigate power distribution equipment/ X# \- \" \: A d
associated with ITE are (a) IEC/UL 60950-1, First Edition; and (b) UL Subject 1801, Outline of
3 r% r2 K" I: j0 Y3 eInvestigation for Power Distribution Centers for Communications Equipment. UL 60950-1 is* `5 w* B4 j2 }1 T8 G6 g. ^
based on IEC 60950-1. Subject 1801 is based in on (in fact was used in part to develop) Annex
% ^8 M) M" H) x; U* YPS-E, DC Power and Distribution Equipment, of proposed IEC 61204-7, Low voltage power Y7 C8 |" V% X, u$ C/ f* n
supplies, d.c. output – Part 7: Safety requirements. Subject 1801 requires compliance to IEC/UL2 L% N9 j& N: F: v7 q# L/ Y$ W2 B
60950 in addition to the supplementary requirements in it." P- K4 H" E; K3 ^& Y
The three main product categories used to investigate power distribution equipment associated
4 z$ \3 w, k1 d/ u/ |with ITE are (a) NWGQ/2, Information Technology Equipment, Including Electrical Business
) t% D. `/ `! V$ S4 kEquipment; (b) QQGQ/2, Power Supplies, Information Technology Equipment, Including
: u ?0 X' y5 B2 M* D' zElectrical Business Equipment; and (c) QPQY/2, Power Distribution Centers for
# F5 x% ]5 C* Y _6 W+ kCommunications Equipment.
2 }0 ?1 Q- [5 v- x B: S7 GPOWER CENTERS FOR IT/COMMUNICATION EQUIPMENT9 ^5 S1 ?! J1 x8 b- Q5 t. L
DECEMBER 31, 2008 PAG 60950-1 21Document Was Downloaded By Peter SC Yeh For Use By MITAC INTERNATIONAL CORP 21014 : 1/4/2009 - 9:29 PM
( q% t$ _9 i! v) o, n; zUL COPYRIGHTED MATERIAL –
( H2 u% ~+ h& pNOT AUTHORIZED FOR FURTHER REPRODUCTION OR$ R2 }# b# ^7 K" L8 J( _2 k8 [! h
DISTRIBUTION WITHOUT PERMISSION FROM UL
/ F; U$ V5 j3 Q9 r' c P0 GReferences are to Figure NAB.1 of IEC/UL 60950-1 (Figure 1A of Subject 1801).
1 O" ^; o1 ~$ Z) g7 W1 z$ \Applicable category and standard for equipment associated with the specified part of system:2 A% Z0 m$ p6 k* U; S1 F9 P
• Charger/Rectifier: QQGQ/2 and IEC/UL 60950-1.
; b+ C, b" P1 m( x% h• Batteries, Discharge Bus, Primary and Secondary Distribution: QPQY and Subject
0 i+ }+ @" h( t8 v& X1801
" \- r8 a0 Y) Z) f. h* q3 h+ A' n– typically part of a DC Power Distribution Center' e9 R5 L. d) v4 Z/ k; x* k4 {! ]
– System/Center may include a QQGQ Charger/Rectifier3 [# X8 M- n$ b
• DC Powered ITE: NWGQ and IEC/UL 60950-1
( _# i. F. t( w3 T; oPOWER DISTRIBUTION EQUIPMENT FOR USE IN COMPUTER ROOMS
3 ~2 n. P/ D* j( [" dApplicable category and standard for equipment:
( K" E. a" ?+ ]0 D! ?6 |• NWGQ/2 and IEC/UL 60950-1
% q N+ j$ ?$ b% `% |1 [% G• Limited to equipment installed exclusively in an ITE (computer) room, connected to
# K* k4 b& _# D, _3 c# y2 }a branch circuit, and having output circuits consisting of receptacles or cable
. A7 _* h" h1 v% h$ T" M4 @/ ^assemblies supplied as part of the equipment. These restrictions are placed on the
, k: u5 P: m% ?1 q# Eallowed equipment because it is not investigated by UL as a separately derived1 Z1 W- |9 t- L6 h6 }, O+ U0 G
system (per the NEC Article 645 allowance). Such equipment typically includes stand-* h; X& C9 S5 @& L3 {
alone power distribution units, computer power centers, and similar equipment for use1 U7 }/ y9 m h3 z
in computer rooms. Power distribution equipment, in particular that with an isolation# L) ?' m$ R5 g6 s4 _
transformer, used outside of a computer room should be investigated to the applicable# q2 g. i; y- Z- U& V
industrial control or distribution transformer standard/category, as appropriate, e.g.,
! k8 h" p3 h% j; ?' ^+ J& ^$ s5 t2 FUnit Substations (YEFR)/UL 1062; Dead Front Switchboards (WEVZ)/UL 891; Dry# l# m; ^. C$ g! u
Type Transformers (XGNX)/UL 1561, etc. UL’s Industrial Control Equipment group
! H2 S, D" x* p ~) f \% y3 Tshould be consulted, as appropriate.
& ]! i1 \9 }( C, gPOWER DISTRIBUTION UNITS FOR USE IN ITE RACKS AND CABINETS
9 B9 @% q) w6 c6 w7 }Applicable category and standard for equipment:$ |* l( U( A+ e$ d( y$ l' D. t0 c. U
• NWGQ/2 and IEC/UL 60950-1.
$ S2 E x9 c6 X+ }. XSuch equipment includes a.c. connected rack mountable power strips and shelves, often similar
0 b# D5 G- E$ w: m; zto relocatable power taps except for use exclusively with ITE.
9 p% x8 \- t( ^3 I1 fRATIONALE:
( j# h+ |1 [+ H$ o9 ^7 HFor many years the only power distribution equipment investigated as ITE were computer power
& S7 F; P9 A! I3 Z. s: r+ hcenters and similar power distribution systems that were intended for installation in computer2 w: n' f* l% m' o. |" k# n% L
rooms. These large systems evolved from the power distribution systems that were originally
$ g( s" a9 Y4 L* P! \integral to large mainframe computers, where a single integral distribution transformers would# s, Z0 d. T9 `- f
supply power to several mainframe bays. However, as computer rooms and computers became
O4 j% M6 T9 i; I& [1 Gmore sophisticated, these power distribution systems were designed into their own cabinets.0 \8 e/ z5 e) V$ \' o+ k# }
This lead to a number of Code-based issues surfacing in the 1980s, in particular whether or not
2 T4 S8 T C3 t ~% athese systems should be considered separately derived systems. In fact, originally, AHJs were5 g# }: W/ g1 o, a& d
DECEMBER 31, 2008 PAG 60950-1 22Document Was Downloaded By Peter SC Yeh For Use By MITAC INTERNATIONAL CORP 21014 : 1/4/2009 - 9:29 PM
& j5 z0 B& d# V$ n1 G! y# k9 aUL COPYRIGHTED MATERIAL –; f* O+ e, n# Y
NOT AUTHORIZED FOR FURTHER REPRODUCTION OR; s) i: d6 {( |6 V# J
DISTRIBUTION WITHOUT PERMISSION FROM UL J) y( }! S+ y: L
requiring NEC Article 250 requirements for separately derived systems to be applied to these3 P. q# i$ \. t. x& _. V3 I2 n
computer power centers. However, eventually Industry was able to have NEC Section 645-15
1 W; v$ }! @# E& irevised to state “Power systems derived within listed information technology equipment that4 S; @6 t7 l9 Y2 o! R
supply information technology equipment through receptacles or cable assemblies supplied as
% Z" H q$ ~1 K) q6 y' N9 U; vpart of the equipment shall not be considered separately derived for purpose of applying Section& ~# a$ ` k+ U o7 j- n; f8 F6 e
250-20(d).” As a result, UL Listed this equipment as ITE, but ONLY for computer room (Article! v \5 a3 {" a
645) applications. Since IEC/UL 60950-1 does not treat such equipment as separately derived,
h8 K' G- h* g) X( y2 Y- g1 Odistribution equipment with integral transformers used outside of computer rooms should not be3 g5 V+ R5 B5 a1 Z1 y8 q/ h
certified under NWGQ since additional requirements for separately derived systems must be
5 Y# p1 V+ S+ L7 bapplied to them and these requirements are not part of IEC/UL 60950-1.
Z" x) t( f5 X" F8 g( v+ RMore recently, other power distribution systems associated with communications equipment, in' a9 P2 r; \, e* y2 A( w4 R' z
particular that associated with centralized d.c., have been submitted for certification. Several
, `7 L, o4 m2 a' wyears ago UL established a product category, QPQY, Power Distribution Centers for
, ^% o/ N. s/ W/ zCommunications Equipment, specifically for covering the equipment associated with the primary
/ m( w6 v$ J+ e9 X; W# vand secondary distribution of the centralized d.c. This category requires compliance with IEC/UL
: L' t5 }7 {) K5 V3 G60950 as its base set of requirements, but supplements IEC/UL 60950 with Subject 1801.
* P1 \8 T9 q- W- p v" J. a Q* G4 SSubject 1801 is required because IEC/UL 60950 does NOT include all the needed requirements, T7 U8 y, {7 T% [. e9 }
to address the safety of constructions such as busbars that distribute very large power levels.8 A/ L8 ?6 {8 x% w
Eventually, it is hoped that proposed IEC 61204-7, Low voltage power supplies, d.c. output –
6 t! B5 x z$ x% f9 f* X6 TPart 7: Safety requirements, will be published, including its Annex PS-E, and UL will be able to
: s* j( ]# U$ e4 @2 Aadopt this IEC Standard as a U.S. National Standard that explicitly addresses d.c. distribution1 O8 v8 Z2 w0 G5 Q7 I
equipment.8 T0 i, g d3 z2 c
Charger/Rectifiers, which are typically connected to a.c. mains and have characteristics similar
$ B* C& R7 n \( K+ E- sto other large ITE power supplies, may be certified under QQGQ/2 because of these similarities.
) b. q/ r2 Y! jSmaller power strips and power distribution units used exclusively with ITE, which are often
; ?1 t9 `: G2 c% N, Dsimilar to relocatable power taps, but which often have much higher input ratings and may have
& I3 O* a* r0 }- mboth NEMA and non-NEMA power outlets, have traditionally been certified under NWGQ/2 and4 T) Q7 p+ r! X0 }7 I) {$ |
may continue to do so since the requirements in IEC/UL 60950-1 are considered adequate for: _0 e( Y( U" R6 ~: v% \
certifying these constructions., t5 K% A; h: B4 ]% N/ K$ r
) U3 l/ w; H9 f, e: v6 G" }# q1.1-3 信息设备电源分配系统的证书选择
# a) W+ | ?5 U问题类型:认证
6 |1 m9 E7 X1 m8 n" C( {+ H4 L5 M) S在信息设备里有不同种类的跟交流,或直流相关的电源分配系统,包括电源分配系统单体,电脑电源中心,充电器、整流器,还有一次,二次分配设备。这样的设备应该用什么标准,应该分配到哪一种产品类别?
& P2 q+ M* O& X" T) ]8 d! |3 ?, O7 G8 V, u
申请 指导:.6 t [+ a1 L% Z0 |" j9 c. h" Q
这两种用来考察电源分配系统的设备的要求应该归属于(a)IEC/UL60950-1,第一版;还有(b) UL目录1801,主要描述了信息设备电源分配系统的考察。UL60950-1 是基于在IEC60950-1.目录1801 是基于在(实际用一部分发展),附录PS-E,直流电源和分配设备,在IEC61204-7被提及到,低电压电源,直流输出-第7部分:安全要求。目录1801要求遵循IEC/UL 60950除非有更多的要求。
4 F8 ?* T* y% v7 N. \5 q, @% q5 F2 ]2 a$ J5 Y; ^3 b K3 T
这三种主要用来考察电源分配设备产品类别相关的信息是(a)NWGQ/2,信息技术设备,包括电子商务,电子商务设备,(C)QPQY/2J,信息设备电源分配中心。
+ p' K; |$ s$ ^& L/ ^6 N0 w! X
# g- R M- @! F, j" X9 Q3 z k信息/通信设备给的电源中心
( B7 a1 S1 E3 R参考图表IEC/UL 60950-1NAB.1(图标目录1801-1A)
3 ?9 k3 e8 Y" J8 w% g# P/ [/ T. q2 L系统指定的跟设备相关的应用分类和标准。
& Q- ]/ S# b1 _, K$ ?. w充电器/整流器:QQGQ/2 和 IEC/UL60950-1.
0 W1 G) N% E! ^. X! i: L" e电池,车载充电器,一次和二次分配:QPQY和目录1801
6 }* n b0 W: T7 ]$ y直流电源分配中心4 g; x' D/ \+ q
系统/中心或许包括QQGQ 充电器/整流器2 n. D! n, P/ R1 s: M( p: u) A
直流供电的信息设备:NWGQ 和IEC/UL 60950-1
4 g9 {- y. \" q B7 k& B1 L2 ~- {6 X( S- E: I
电脑房里用的电源分配设备。* O+ [( R. f$ H3 f
应用分类和设备的标准:
* {7 N1 h, W# [ d. ONQGQ/2 和 IEC/UL60950-1
2 L7 }. w" ~7 U2 W) S1 R; E限于设备安装只在一个电脑房间,跟分支电路相连,并且有输出电路。这些限制被放在允许的设备上面因为他不被UL所考量作为单独源自系统(根据国家电工委员会645决议)。这样的设备特别包括电源分配系统,电脑电源中心,和电脑房里用的简单设备。电源飞陪设备,特别是变压器,电脑房外用应该被考量或者分配变压器标准/类别,单体分局。转换板;干燥转换器(XGNX)/ul1561,等等,UL的工业控制设备
4 } l4 G% O0 U' p/ C2 D2 C/ B4 u
信息设备支架和柜子里面的电源分配单体$ ^: n! w, T1 ^+ \' \6 T/ `" U- X3 d1 D
应用类别和设备的标准。7 w2 ] Z# y2 w, ?4 ]! f5 A4 U
-NWGQ/2 和 IEC/UL 60950-1.# t/ M; A+ V2 S& X/ l
类似内置在电源架子里面的直流设备,常常被划分为电源类,除非特别化为信息类设备。
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N0 T+ N! ]" W9 w( g& B5 p- A& L基本原理:
: c0 I# d1 P/ i* ~* N. s许多年以来,被认为是信息类设备的电源分配设备仅仅是计算机电源中心和简单的电源分配系统。许多大型系统囊括了电源分配系统和原始整合的大型主机电脑。单体的整体所需的分配变压器会给许多刀片主机供电。但是,向电脑机房和电脑变得更精密,这些电源分配系统被设计安置在格子里。导致90年代许多问题,铁别是是否这些系统应该被划分在系统之外。事实上最初AHHS要求国际电泳委员为250项要求中吧这种电源分配系统划分出来。但是事实向工厂能把国际电工远非地645-15“那些给信息设备供电的被划分到信息技术设备里面的电源系统或者是设备的电线分配不应该被分离出来”。结果UL把这些设备列为信息类设备,但仅仅是那些应用在电脑机房里的电气设备。自从IEC/UL 60950-1不把这样的设备单独划分出来,备用到户外电源机房里的带有基本变压器的分配设备,不用改被用类别好NWGQ认证,自从跟多要求要单独分配系统。这些要求不是IEC/UL60950-1中的一部分。
, s: ]6 A$ h1 f7 ^$ ^8 P" U0 s/ j$ C" m3 w7 p: k( A
最近,其他跟通信设备有关的电源分配系统,铁别是跟直流有关的,已经被要求认证许多年前UL建立了产品类别好,QPQY,通信设备的电源分配中心特别是波阔设备的主刺激分配直流中心。这个类别的要求应用于IEC.UL 60950 。但是附加IEC/ul60950 第1801案子,1801案子是被要求的因该IEC/UL60950 不包括所有需要的设备去到到安全结构7 ]& E( _4 O8 l% O
事实上,本来是想依照,IEC 61204-7,低电压电源,直流输出,安规要求要被公布出来,包括附录PS-E,UL会取消美国国家标准
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) z7 M6 R) P% q& w; Y* P充电器/整流器,那些跟直流电源相连,有一些信息设备电源的特征,或许因为相似性被按照QQGQ/2来认证。) q; p1 O( X0 }
小一点的移动式电源插座和电源分配系统特别跟信息设备一起用的,往往类似的电源,但是往往有很高的输入值而且也许有nema 和非NEMA电源输出,通常经过NWGQ/2的认证而且也许继续这样写去依照IEC/UL 60950-1 去考虑这些设备是被认为合适的。 |
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