谁比较熟悉UL1012标准，输出电路接地怎么理解？

lanfeiyuner

广东安规检测
有限公司提供：

小型摆管淋雨试验机

IPX5X6X7喷水试验机

1000L恒温恒湿箱

各种试验指现货

可程式恒温恒湿试验箱

水平垂直燃烧机

自动卷线器试验机

耐划痕试验机

各种灯头量规现货

灼热丝试验机现货

GB1002插头量规

IPX1-X7淋雨现货

IEC61347/UL935镇流器热试验箱

灯具防风罩

IK冲击试验机

UL498插头插座量规

VDE0620插头插座量规

稳定性试验台

家电温升测试角

针焰试验机现货

热电偶焊机现货

家电125mm试验指

E12灯头量规

无绳壶无绳电熨斗插拔寿命试验机

IEC60335试验指甲

20 Output Circuit Grounding
  N- R2 D! X1 W) m; Z6 ?20.1 The requirements for circuit grounding specified in 20.2 – 20.12 apply to the output circuit of fixed
5 l6 V: \8 G4 _  w- vunits and of units having standard configuration grounding type receptacles for the output ac power
connections.
  U% h& L9 r; s20.2 An output ac power circuit shall be grounded when:
a) The circuit has no electrical connection, including a solidly connected grounded circuit
conductor, to supply conductors originating in another wiring system;
b) The circuit is rated 50 – 600 volts; and
" ?. g  O& M+ l/ \c) The circuit is as described in (1) – (3). See requirements for Alternating-Current Circuits and
, w4 {* h3 K* B! A& s* O7 ISystems to Be Grounded in the National Electrical Code, ANSI/NFPA 70, for other circuits:
/ ]1 g+ i" A7 I4 B, y( G1) A circuit that is grounded so that the maximum voltage to ground on the
* `1 u2 P% Y6 {4 Z; Lungrounded conductors does not exceed 150 volts. This requires that one conductor of
- f1 u/ ]. A% G% }0 t7 p6 |1 r0 ~each of the following circuits be grounded:
i) 120 volts, 2-wire;
" U: A$ Z4 G" M: q% N2 b  ?- sii) 240/120 volts, single-phase, 3-wire;
iii) 208/120 volts, two-phase, 3-wire;
/ I9 D' _( I) g6 w" O9 M: P2 |6 ziv) 208/120 volts, three-phase, 4-wire.
4 ]+ G1 o# i" Q& v2) A circuit nominally rated 480 wye/277 volts, 3-phase, 4-wire in which the neutral is
used as a circuit conductor.
" u. N8 w; T: _, R4 v3) 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
; o& l' W/ g8 ]6 Tcomplies 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:
# S: `7 g: h+ m; P* Ca) Single-phase ac system, 2-wire – one conductor.
4 K2 R6 Z# I. l1 H, r/ Ib) Single-phase ac system, 3-wire – the neutral conductor.
0 v1 {* f  \& Xc) Multiphase ac system having one wire common to all phases – the common conductor.
2 ]& I, P  J  C/ [* ?0 Od) Multiphase ac system where one phase is used as in (b) above – the neutral conductor.
( m+ q. i& t/ F

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
不知道你要说什么问题,关键是你的问题是什么?

- l2 e* Q2 r7 l/ ?8 Z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？
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；
5 I9 s+ @( c; m" a3 `4 i& n0 s8 u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
- H5 m4 i5 K( m1 S% T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？
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

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。
8 C# q# o9 Z% g9 v1 g5 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
2 h6 I' z: T9 F4 U  o) q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
我印象中，你这标准选择就不对，用UL1012

5 m( K" t0 N5 b* }1 J3 V0 q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。
  v# d4 X7 y: H- ^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
7 F7 y3 C( Z. Q$ _0 D3 T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
UL 458, 像你这小功率；大功率的话UL 1741

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！
UL458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。）
- f5 D  H# z" J* e6 y& v! A24 Inverter Output Circuits
24.1 A unit having output circuits for supplying 120 V, 60 Hz, 2-wire with ground or 120/240 V, 60 Hz,
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.
Exception No. 1: A unit that does not have an integral output receptacle, and that has a wiring
- [2 F  ?, U0 p/ z0 t8 {compartment with pigtail leads, wiring terminals, or other equivalent means for output field-wiring
, @/ A) o: s) E! V8 Bconnections 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.
Exception No. 2: A portable unit need not be provided with integral ground-fault circuit-interrupter
protection if the unit:
+ V0 Q/ `% e- Xa) 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.