零线和地线连在一起

daocaoren

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

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IEC61347/UL935镇流器热试验箱

灯具防风罩

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无绳壶无绳电熨斗插拔寿命试验机

IEC60335试验指甲

今天听到同事说美国的branch circuit 零线和地线是连在一起的，零线是没电的，
不知道有这么多学问，谁能告诉我真相啊.

fasten

这个要回到电工学了，理解一下电势的概念。

jsspace

LZ自己找资料学习以下几种接地保护方式吧
% F+ |8 n8 X1 B3 K( CTN系统、IT系统。其中TN系统又分为TN-C、TN-S、TN-C-S系统。

billma

Step-by-Step Installation Process for a Secure and Safe Connection
4 q7 B% X+ M; ?  i$ \* |% }1 h1 ?+ vNow the fun part: installing that 3-prong dryer cord yourself. Don’t worry — it’s not rocket science if you take it slow and follow these steps. Remember: always unplug your dryer from the power source before starting.
1.Remove the Old Cord: Unscrew the panel on the back of your dryer where the cord attaches. You’ll see three screws holding the cord’s wires.
& x+ V, b, D3 T7 N2.Note the Existing Wiring: Take a picture or make a note of how the current cord is hooked up. The two outer wires are usually hot (live), the middle one is neutral.
3.Disconnect the Old Cord: Loosen the screws and remove the old cord wires from the terminals. Disconnect the bare ground wire if present.
( [1 T. H* [# c' N! E4.Prepare Your New 3-Prong Cord: Strip the ends of the wires if needed to expose about ½ inch of copper.
4 a: m: I$ z# V; Y' Q' }5.Connect the Outer (Hot) Wires: Attach the left and right wires of the new cord to the outer terminals — usually brass screws. Tighten firmly.
% y! j) Z0 i6 X& S2 g6.Connect the Neutral (Middle) Wire: The middle wire connects to the center terminal, often a silver screw. But here’s the kicker — you need to attach the dryer’s metal frame to this neutral terminal to ground it properly. Usually, this means reconnecting a grounding strap or wire to the neutral terminal, bonding the frame and neutral together for safety on a 3-wire setup.
( m3 G, }/ F- \! L* q# p: m7.Secure the Cord: Use the strain relief clamp over the cord to hold it snugly, preventing any tension on the terminals.
# l. W- b: ]4 L1 ?8 B9 q8.Close the Panel: Screw the access panel back on tight, so no wires can be accidentally pulled loose.
9.Plug In and Test: Now, plug the dryer cord into your 3-prong wall outlet and power it on to test. You should hear the dryer hum to life without sparks or weird smells.
) o% I/ p- b" }3 rRemember, the middle wire doubles as neutral and ground on a 3-prong setup, unlike newer 4-wire cords. It’s crucial to bond the dryer frame to the neutral terminal — skipping this is a common mistake that could create shock hazards.

billma

Step-by-Step Installation Process for a Secure and Safe Connection
" ~  j4 f/ M1 m% F3 SNow the fun part: installing that 3-prong dryer cord yourself. Don’t worry — it’s not rocket science if you take it slow and follow these steps. Remember: always unplug your dryer from the power source before starting.
1.Remove the Old Cord: Unscrew the panel on the back of your dryer where the cord attaches. You’ll see three screws holding the cord’s wires.
, Z* C; l' \9 N6 A/ R9 ]2.Note the Existing Wiring: Take a picture or make a note of how the current cord is hooked up. The two outer wires are usually hot (live), the middle one is neutral.
- B# E! r9 I. ?) v3.Disconnect the Old Cord: Loosen the screws and remove the old cord wires from the terminals. Disconnect the bare ground wire if present.
( _0 v7 [% E' F6 \& x! _4 _* z4.Prepare Your New 3-Prong Cord: Strip the ends of the wires if needed to expose about ½ inch of copper.
5.Connect the Outer (Hot) Wires: Attach the left and right wires of the new cord to the outer terminals — usually brass screws. Tighten firmly.
& Y) R1 V2 Z7 {6.Connect the Neutral (Middle) Wire: The middle wire connects to the center terminal, often a silver screw. But here’s the kicker — you need to attach the dryer’s metal frame to this neutral terminal to ground it properly. Usually, this means reconnecting a grounding strap or wire to the neutral terminal, bonding the frame and neutral together for safety on a 3-wire setup.
6 ^; y- ~( @* \8 f1 Z7.Secure the Cord: Use the strain relief clamp over the cord to hold it snugly, preventing any tension on the terminals.
$ J2 B3 I' A! Q+ j3 U* c) x8.Close the Panel: Screw the access panel back on tight, so no wires can be accidentally pulled loose.
8 R5 n3 B# ^" [& ~" D% F# e$ q9.Plug In and Test: Now, plug the dryer cord into your 3-prong wall outlet and power it on to test. You should hear the dryer hum to life without sparks or weird smells.
Remember, the middle wire doubles as neutral and ground on a 3-prong setup, unlike newer 4-wire cords. It’s crucial to bond the dryer frame to the neutral terminal — skipping this is a common mistake that could create shock hazards.

浪漫罗丹

感谢大牛分享 学习了