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标题: 谁比较熟悉UL1012标准，输出电路接地怎么理解？ [打印本页]
作者: lanfeiyuner    时间: 2017-10-19 09:10
标题: 谁比较熟悉UL1012标准，输出电路接地怎么理解？
20 Output Circuit Grounding! Q' O; h8 N9 Q5 v3 O5 S
20.1 The requirements for circuit grounding specified in 20.2 – 20.12 apply to the output circuit of fixed
; x' \8 l# I" A; O9 j7 e; ~7 ]units and of units having standard configuration grounding type receptacles for the output ac power
2 ^3 k/ Y$ R8 e! F& B; d9 X7 Bconnections./ C4 @* o- z- X, `4 j
20.2 An output ac power circuit shall be grounded when:9 u2 [$ K- k; N9 ?  P; A
a) The circuit has no electrical connection, including a solidly connected grounded circuit
2 ?4 k: }6 A! c  P  z# Y3 Rconductor, to supply conductors originating in another wiring system;4 |5 w. H7 C% i3 ~+ g1 X" s
b) The circuit is rated 50 – 600 volts; and
1 H2 v; _1 v' K1 Z) [3 ]4 gc) The circuit is as described in (1) – (3). See requirements for Alternating-Current Circuits and& x  t1 ?  @4 @6 p
Systems to Be Grounded in the National Electrical Code, ANSI/NFPA 70, for other circuits:' ^# Z3 k7 q, I  y
1) A circuit that is grounded so that the maximum voltage to ground on the; e0 I+ f' ?1 t; I0 e( g1 y
ungrounded conductors does not exceed 150 volts. This requires that one conductor of
) l! ^1 S0 ~% |2 `each of the following circuits be grounded:
/ U& o" Y& V' X; Z+ r9 F1 ii) 120 volts, 2-wire;/ a8 Z% {4 T5 h6 b
ii) 240/120 volts, single-phase, 3-wire;
8 n0 j  I/ k1 D5 S. ?8 t+ y4 Siii) 208/120 volts, two-phase, 3-wire;
' c5 y* D3 R( r5 _- biv) 208/120 volts, three-phase, 4-wire.
" v& x4 E+ ]; s! o2) A circuit nominally rated 480 wye/277 volts, 3-phase, 4-wire in which the neutral is/ S) A) U5 R- s0 l* E
used as a circuit conductor.
5 W, n  D4 R$ |, T8 l# O  R3) A circuit-nominally rated 240/120 volts, 3-phase, 4-wire in which the midpoint of one
3 Y& N$ Q2 ^, b; S3 n; nphase is used as a circuit conductor.3 N3 X* i5 d, k# U
For other units, an output ac power circuit complying with (a) is able to be grounded when the construction, c- P7 {" ~3 p) M% l
complies with the requirements described in 20.3 and 20.11.
3 O+ x- @7 |- q8 t8 B' u20.3 With reference to 20.2, the conductor to be grounded shall be as follows:  t; n3 t5 r; \* T" L9 g7 O
a) Single-phase ac system, 2-wire – one conductor.' F5 z: j4 h4 b. n' j  p; \
b) Single-phase ac system, 3-wire – the neutral conductor.
8 G- t7 X& T" P* ec) Multiphase ac system having one wire common to all phases – the common conductor.4 T* y" Z1 n/ y" x* s
d) Multiphase ac system where one phase is used as in (b) above – the neutral conductor.
1 T% e! }# K; A( h4 W- v
作者: fasten    时间: 2017-10-19 11:11
不知道你要说什么问题,关键是你的问题是什么?
作者: lanfeiyuner    时间: 2017-10-19 11:30
fasten 发表于 2017-10-19 11:112 O3 X" D% |$ x) Z
不知道你要说什么问题,关键是你的问题是什么?

7 j: D. }/ m1 h; Y- M这个AC输出的一跟线接地应该怎么接，有谁做过这类产品，是怎么处理的？
. U5 e3 _' k/ ]) Z如果外壳是金属接地的，如果AC接地，岂不是把AC与外壳直接相连了，怎么满足危险电压到金属外壳的基本绝缘的要求了；
% @: }3 A3 g" v; u7 R- E. c& ]如果不接地，则配电系统就从TN变成了IT了，漏电保护装置不起作用，也不满足标准这个条款要求了；
* p  g1 [+ F; y( I0 H. D4 v$ k% {如果是便携式设备，塑胶外壳的，在因为是便携，产品用于无电区域，是无法接地的，怎么去满足或者规避此条款要求，类似产品有工地使用的柴油发电机，其输出的相线是否需要接地？
作者: sky0805    时间: 2017-10-19 13:19
尚須高手出面解釋囉~
作者: ralf    时间: 2017-10-20 09:21
lanfeiyuner 发表于 2017-10-19 11:30
, h' V& {( ]" Z! C/ U这个AC输出的一跟线接地应该怎么接，有谁做过这类产品，是怎么处理的？
6 j) b1 j7 z  k! Q& C如果外壳是金属接地的，如果AC接 ...
) c8 v1 @! b2 a' x( i
说了一大堆，还是云里雾里。根本不知你要说什么？输入是什么情况也没有
作者: lanfeiyuner    时间: 2017-10-20 13:24
ralf 发表于 2017-10-20 09:21
1 w/ m, t5 s+ P( @说了一大堆，还是云里雾里。根本不知你要说什么？输入是什么情况也没有
/ {  m, M7 r6 P5 _3 g
好吧，考虑欠周，产品是逆变器，输入为DC，对于有AC输入的UPS来说，直接把电网的N线直接连接到输出端口上，确实就没有我说的问题了。; E* O! W3 l6 A9 v% b5 L% n
现在是纯逆变器，无电网接入的，怎么解决此问题？
作者: ralf    时间: 2017-10-20 13:44
lanfeiyuner 发表于 2017-10-20 13:24
" e9 l6 m- z2 g" x$ N7 _好吧，考虑欠周，产品是逆变器，输入为DC，对于有AC输入的UPS来说，直接把电网的N线直接连接到输出端口上 ...

% v1 r' l: T6 z4 ^- }- T$ i6 C我印象中，你这标准选择就不对，用UL1012
作者: lanfeiyuner    时间: 2017-10-20 14:13
ralf 发表于 2017-10-20 13:44
3 [" ~4 F& [/ h) U我印象中，你这标准选择就不对，用UL1012

) T/ A3 S: g! b& C* t1 M( E那应该选择哪个标准更合适？
# H4 H4 v) d2 w5 b8 O即使使用的不是UL1012标准，只要是AC输出都需要考虑同样的问题。/ A- N- p& J0 h, _( V* v7 ?
有竞争对手的产品，也是用的UL1012标准，其输出未考虑接地问题，至于其怎么过的认证，就说不清了！
作者: ralf    时间: 2017-10-20 15:18
lanfeiyuner 发表于 2017-10-20 14:13
. u) Q* X  x3 j. `8 r1 G那应该选择哪个标准更合适？  M- M; @: h/ Y4 J2 [
即使使用的不是UL1012标准，只要是AC输出都需要考虑同样的问题。& ^* H# L( W3 D) G. v
有竞争对 ...
) ^1 _. E" f' ]8 Q
UL 458, 像你这小功率；大功率的话UL 1741
作者: lanfeiyuner    时间: 2017-10-23 13:58
ralf 发表于 2017-10-20 15:18
5 Y7 }' g; z+ b' z6 J8 f; I3 RUL 458, 像你这小功率；大功率的话UL 1741
+ F& j1 J1 m8 J" W% P1 C, u: ~
UL1741是分布式能源的，一般是储能变流器，光伏逆变器使用此标准，这个便携式应该不是很合适吧！
  ]0 s1 f# B6 m& g$ W2 uUL458是车载逆变器的标准，我们这个虽然不是车载的，但是是其因为是便携式的，所以看起来好像使用UL458是更合适点，特意对接地这个问题找了第24章，这章没理解，是需要接地和GFCI吗，没有理解车载的设备怎么提供接地，GFCI怎么工作（产品是带标准outlet的。）. }) P- s& z3 @5 @1 c
24 Inverter Output Circuits
7 r9 Y6 P, ?2 q9 }8 e24.1 A unit having output circuits for supplying 120 V, 60 Hz, 2-wire with ground or 120/240 V, 60 Hz,
  T+ ?& V+ ~7 L( H0 U/ K( p3-wire with ground to vehicles and recreational vehicle wiring systems shall have the output circuits# r( t' X9 J1 n2 I
protected by integral ground-fault circuit-interrupters intended for the current involved.3 I# {; p7 a& n" b2 s$ h4 T
Exception No. 1: A unit that does not have an integral output receptacle, and that has a wiring( b+ \+ c1 l7 m* r, ^  e
compartment with pigtail leads, wiring terminals, or other equivalent means for output field-wiring/ `% N9 Z5 b/ l
connections need not be provided with integral output circuit ground-fault circuit-interrupter protection if:# o. Z: O1 h4 _
a) The unit is marked in accordance with 58.21, and
' q$ f4 |; m% I, ], E% ?% Sb) The installation and operating instructions manual for the unit comply with 59.1.
8 H9 V, G) u* L3 FException No. 2: A portable unit need not be provided with integral ground-fault circuit-interrupter
  R& I5 ], D9 P6 Q# E+ y; [protection if the unit:) k& k$ e  e7 x2 h/ @
a) Is intended to be connected to the cigarette lighter outlet of a vehicle, and6 y$ W7 H$ J6 _
b) Has no direct electrical connection between the input and output circuits.



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