由於TN-C系統所固有技術上的種種弊端，現在已很少採用，尤其是在民用配電中，已基本上不允許採用TN-C系統。
TN-C系統的特點
1.設備外殼帶電時，接零保護系統的熔絲會熔斷或自動開關跳閘，使故障設備斷電。
2.只適用於三相負載基本平衡的情況，否則工作零線上有不平衡電流，對地有電壓。
3.工作零線斷線，保護接零的通電設備外殼帶電。
4.電源的相線接地，設備的外殼電位升高，使中線上的危險電位蔓延。
5.實用中工作零線只能在漏電斷路器的上側重複接地。
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TN-C system features
1. When the equipment casing is energized, the fuse of the zero-protection
system will be blown or the automatic switch will trip, causing the faulty
equipment to be powered off.
2. Only applicable to the basic balance of three-phase load, otherwise there
will be unbalanced current on the working zero line and voltage on the
ground.
3. The working neutral wire is broken, and the outer casing of the energized
equipment that protects the zero is charged.
4. The phase line of the power supply is grounded, and the potential of the
device's case rises, causing the dangerous potential on the center line to
spread.
5. In practice, the working neutral line can only be grounded repeatedly on
the upper side of the leakage circuit breaker.
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professional team intimate attention to customer requirements, and provide
quality services.
For more information about 'TN-C system features'，please visit : http://livservices.com.hk
Address: Unit 4, 4/F., Hung Tai Industrial Building,37-39 Hung To Road, Kwun
Tong, Hong Kong
Tel: +852 3106 3235
