1. 接地的目的：限制闪电电压、浪涌，减少电击风险
2. 接地的定义：产品或导电部分和地线相连接

 

1. 产品接地
2. 装过流保护器

UL认证过程中设备什么时候需要接地

1. Where fastened in place or permanently wired, and located near ground or grounded touchable objects (< 8 ft vertical, < 5 ft horizontal)
2. Where operating at over 150 volts to ground
3. Where located in wet or damp location
4. where in a hazardous (classified) location as covered by NEC Articles 500 – 517
5. Permanently wired equipment supplied by metal-clad, metal-sheathed or metal raceway that provides an equipment ground
6. Specific permanently wired equipment (NEC Article 250-112)
7. Specific cord and plug-connected equipment (NEC Art 250-114)

典型的接地要求
1.接地线至少要18AWG
2.接地线要有接地标识“G”、“GR” 、“Ground” 、“Grounding”
3.接地线颜色用绿色或者黄绿色表示
4.接地只起接地作用
 

GROUDING 和 BONDING 区别
GROUDING: 和大地相通的地线, BONDING:通过回路和产品的其他点相通
灯具接地时，各个部件内部的接合，比如从地线到canopy之间的接合，canopy到灯具支架的结合，灯具支架到灯杯之间的接合。只有这些金属部件bongding起来，grounding才能实现
 

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