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
20.1 The requirements for circuit grounding specified in 20.2 – 20.12 apply to the output circuit of fixed
* W0 ?+ D" o& s0 O" q. l" Tunits and of units having standard configuration grounding type receptacles for the output ac power
connections.
20.2 An output ac power circuit shall be grounded when:
a) The circuit has no electrical connection, including a solidly connected grounded circuit
9 _" ^* H7 K6 n( \* Vconductor, to supply conductors originating in another wiring system;
b) The circuit is rated 50 – 600 volts; and
* |. L' I, M3 Y9 \! l: sc) The circuit is as described in (1) – (3). See requirements for Alternating-Current Circuits and
Systems to Be Grounded in the National Electrical Code, ANSI/NFPA 70, for other circuits:
# t! _# K( A5 @6 g1) A circuit that is grounded so that the maximum voltage to ground on the
+ L/ a, a* f: b) sungrounded conductors does not exceed 150 volts. This requires that one conductor of
each of the following circuits be grounded:
i) 120 volts, 2-wire;
8 D; U; D+ d1 g0 Eii) 240/120 volts, single-phase, 3-wire;
) r* t. }( ?3 @. qiii) 208/120 volts, two-phase, 3-wire;
iv) 208/120 volts, three-phase, 4-wire.
" a, g, |3 Z0 `/ t  x2) A circuit nominally rated 480 wye/277 volts, 3-phase, 4-wire in which the neutral is
used as a circuit conductor.
3) A circuit-nominally rated 240/120 volts, 3-phase, 4-wire in which the midpoint of one
phase is used as a circuit conductor.
3 {+ Q4 F7 {$ D0 k' xFor other units, an output ac power circuit complying with (a) is able to be grounded when the construction
) j( m. m5 o$ i* d( {complies with the requirements described in 20.3 and 20.11.
; B- l! H; f! h/ s20.3 With reference to 20.2, the conductor to be grounded shall be as follows:
a) Single-phase ac system, 2-wire – one conductor.
8 x! \* e* }& kb) Single-phase ac system, 3-wire – the neutral conductor.
$ a" q% m+ |. G- W. {2 [( v" fc) Multiphase ac system having one wire common to all phases – the common conductor.
1 e1 y2 S# b3 m6 n6 B; ^$ @* |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
8 w) h! H. r* S2 |, g7 ~' _不知道你要说什么问题,关键是你的问题是什么?

1 ^, e( m5 B1 D2 g( e0 `( v, I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？
: }# a* Z6 @7 h( m4 W& I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；
8 D: o" K& q; b  H9 S; P; q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；
! t* e( e& I; }- J) Z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
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？
8 K0 w6 R: `5 O% [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
# A. w% y6 Q0 r6 y0 O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

7 w0 D* A6 [/ Q3 |* G# W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。
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
8 y2 N! N- d0 O: F1 Q! Y3 T. r9 ~# d9 g我印象中，你这标准选择就不对，用UL1012

9 W7 @5 F1 M) u那应该选择哪个标准更合适？
: g2 A. x3 c/ y( {/ N) C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。
$ W) O8 M8 }# ?, r; f8 g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 L* ?, w2 U) Q那应该选择哪个标准更合适？
% T9 M. V1 P7 ~( s. P% t/ E  }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 ...

) i* Z+ z0 u& k, w4 G; D4 Y& jUL 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

% d( G+ N) G, QUL1741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！
8 u1 S# X" L) v3 NUL458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。）
+ \8 T7 j' \0 l, U) C24 Inverter Output Circuits
8 ?" G8 e' ^2 v, ~$ e24.1 A unit having output circuits for supplying 120 V, 60 Hz, 2-wire with ground or 120/240 V, 60 Hz,
3 O" i  o1 V& b- \- x7 L7 Z" g8 ]3-wire with ground to vehicles and recreational vehicle wiring systems shall have the output circuits
" R7 X. \9 _: I2 k/ Z- `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
1 ?; S* V  b& U1 }# A; X! ccompartment with pigtail leads, wiring terminals, or other equivalent means for output field-wiring
connections 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
3 q! W- F: e; Kb) 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
$ N5 c* Q. J* `/ u* D  `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.