谁比较熟悉UL1012标准，输出电路接地怎么理解？

lanfeiyuner

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20 Output Circuit Grounding
& i- ]# F8 u( H9 S+ Z' c$ J: g5 v# u20.1 The requirements for circuit grounding specified in 20.2 – 20.12 apply to the output circuit of fixed
: W, {/ a) V* Y. o7 W* _: P5 cunits and of units having standard configuration grounding type receptacles for the output ac power
connections.
) O! i1 k4 K+ \2 D( g20.2 An output ac power circuit shall be grounded when:
a) The circuit has no electrical connection, including a solidly connected grounded circuit
  ?0 e& T, _; mconductor, to supply conductors originating in another wiring system;
) m3 Z5 O8 @5 E1 g$ h$ Gb) The circuit is rated 50 – 600 volts; and
c) The circuit is as described in (1) – (3). See requirements for Alternating-Current Circuits and
( C  v) j$ M. M7 z, o& ?Systems to Be Grounded in the National Electrical Code, ANSI/NFPA 70, for other circuits:
" A0 `* b6 q! R/ L0 [$ S1) A circuit that is grounded so that the maximum voltage to ground on the
( W& z$ R* E+ v% `" r4 X# X9 \; vungrounded conductors does not exceed 150 volts. This requires that one conductor of
  S& D- ~7 A8 P' heach of the following circuits be grounded:
i) 120 volts, 2-wire;
+ m4 x* F* U# dii) 240/120 volts, single-phase, 3-wire;
iii) 208/120 volts, two-phase, 3-wire;
iv) 208/120 volts, three-phase, 4-wire.
+ Q/ o9 K, K$ k, s! E0 h4 ?$ g2) A circuit nominally rated 480 wye/277 volts, 3-phase, 4-wire in which the neutral is
used as a circuit conductor.
* p" t" I4 P* Z7 W4 j( Z3) A circuit-nominally rated 240/120 volts, 3-phase, 4-wire in which the midpoint of one
phase is used as a circuit conductor.
For other units, an output ac power circuit complying with (a) is able to be grounded when the construction
0 T6 ~6 A5 {0 H. Z& L! c% }complies with the requirements described in 20.3 and 20.11.
20.3 With reference to 20.2, the conductor to be grounded shall be as follows:
a) Single-phase ac system, 2-wire – one conductor.
b) Single-phase ac system, 3-wire – the neutral conductor.
. |) _( E0 g* w- h' sc) Multiphase ac system having one wire common to all phases – the common conductor.
/ H' N" h; w( H# [. [d) Multiphase ac system where one phase is used as in (b) above – the neutral conductor.

fasten

不知道你要说什么问题,关键是你的问题是什么?

lanfeiyuner

fasten 发表于 2017-10-19 11:11
/ r; K+ s1 n9 @- s- L不知道你要说什么问题,关键是你的问题是什么?

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？
# y) P1 j$ k7 z' W. x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；
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；
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？

sky0805

尚須高手出面解釋囉~

ralf

lanfeiyuner 发表于 2017-10-19 11:30
2 V1 H0 F  ~- _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？
3 J6 y5 J7 g, d7 g1 ^5 V$ h如果外壳是金属接地的，如果AC接 ...

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

lanfeiyuner

ralf 发表于 2017-10-20 09:21
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

4 o' V2 B3 n3 B: d: j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。
, k3 |* P: _* B现在是纯逆变器，无电网接入的，怎么解决此问题？

ralf

lanfeiyuner 发表于 2017-10-20 13:24
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 ...

我印象中，你这标准选择就不对，用UL1012

lanfeiyuner

ralf 发表于 2017-10-20 13:44
4 k* H4 F, y2 t( Y. q$ Q我印象中，你这标准选择就不对，用UL1012

6 h$ B+ I4 x2 g( W# o$ w# y" X那应该选择哪个标准更合适？
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。
3 A9 B& o: l% |/ ?2 w# ^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！

ralf

lanfeiyuner 发表于 2017-10-20 14:13
. t& t# L! o& f# o7 Q1 @那应该选择哪个标准更合适？
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。
有竞争对 ...

UL 458, 像你这小功率；大功率的话UL 1741

lanfeiyuner

ralf 发表于 2017-10-20 15:18
) q1 N5 e5 z" M3 M! m& S* e  CUL 458, 像你这小功率；大功率的话UL 1741

. Y5 w2 I5 B' M9 H& [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！
, E: _# v+ s5 Y, M5 w7 O8 @7 qUL458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。）
2 u# {' I3 W. s" a1 w3 e& j, l24 Inverter Output Circuits
8 g- L$ H$ \' I$ r0 }( L24.1 A unit having output circuits for supplying 120 V, 60 Hz, 2-wire with ground or 120/240 V, 60 Hz,
( n* ~3 r: z) c/ W$ Y. j4 ]3-wire with ground to vehicles and recreational vehicle wiring systems shall have the output circuits
protected by integral ground-fault circuit-interrupters intended for the current involved.
- V7 R9 G4 G  b7 g. s9 A6 f* n' HException No. 1: A unit that does not have an integral output receptacle, and that has a wiring
compartment with pigtail leads, wiring terminals, or other equivalent means for output field-wiring
! L  y- R* k8 h/ O$ A7 d9 Mconnections need not be provided with integral output circuit ground-fault circuit-interrupter protection if:
a) The unit is marked in accordance with 58.21, and
b) The installation and operating instructions manual for the unit comply with 59.1.
; b# }! v4 X- s1 R# {Exception No. 2: A portable unit need not be provided with integral ground-fault circuit-interrupter
protection if the unit:
a) Is intended to be connected to the cigarette lighter outlet of a vehicle, and
b) Has no direct electrical connection between the input and output circuits.