汽车交通运输及管理知识分析周刊(英文版)(PPT 69页)
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汽车交通运输及管理知识分析周刊(英文版)(PPT 69页)简介：
The 120/240 service is attached to the master disconnect (breaker).
From master breaker each hot conductor is connected to one of the conducting breaker bars.
The 120/240 neutral conductor is attached to the grounding bar.
Equipment grounding is the bonding of all non current carrying metal components back to the SEP.
The equipment ground is designed to provide a low resistant circuit to the earth in the event of a short from the energized conductor to any metallic component.
Must make a complete, low resistance circuit from all metallic electrical devices in the system to the earth.
240 Volt circuits have three conductors:
Two hot
Equipment ground
Neutral circuit is not required unless both 240 and 120 circuits are supplied by the device.
The 240 Volt electrical service to the SEP will have a neutral so both 240 and 120 Volt branch circuits can be used.
Designed for temporary loads such as lights and DCOs (Duplex Convenience Outlets) under 1500 W.
Minimum 12 AWG
Fused at 20 amps
No more than ten (10) DCOs or light fixtures per circuit. (Fig. 2-3, pg 21)
Recommended location for DCOs (Table 1-12, pg 18).
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