wire color standard tell us something

wire color standard 

          ปัจจุบันมาตรฐานสีสายไฟได้มีการเปลี่ยนแปลงมาใช้ มอก.11-2553 ซึ่งมาตรฐานเดิมคือ มอก.11-2531 สาเหตุที่เปลี่ยนเนื่องจากสำนักงานมาตรฐานผลิตภัณฑ์อุตสาหกรรม (สมอ.) ต้องการให้สายไฟทั้งภาคอุตสาหกรรมและครัวเรือนในประเทศไทย มีมาตรฐานเทียบเท่าสากล (Standards  IEC 60227 )

wire color 

1. Black (turns brown) Refers to L or L1, the 1st line anode. 
2. Red (turn to black)Refers to L2, the 2nd line anode. 
3. blue (turns gray)Refers to L3, the 3rd line anode. 
4. white or gray (turns blue)Means N low potential cathode 
5. green or yellow green (set in green with yellow) means G grounding, protecting against short circuit or fire hazards. 
   
   

Differences in 1-phase and 3-phase power systems are as follows: 

power system 1 phase ( 220 V ) 

• The positive phase wire (L) is insulated brown. 
• The negative (N) neutral wire is insulated in blue. 
• Short-circuit protection ground (G) Insulator is green with yellow stripes. 

3 phase power system ( 380 V ) 

• The positive phase wire (L1) is insulated brown. 
• The positive phase wire (L2) is insulated in black. 
• The positive phase wire (L3) is insulated in gray. 
• The negative (N) neutral wire is insulated in blue. 
• Short-circuit protection ground (G) Insulator is green with yellow stripes.

TIPS 

1. When working with electricity, always use a check tool for safety. 
2. The basic tools you should have at home are wires, pliers, cutters, and duct tape. 
3. If you don't have knowledge of electricity, it's safer to have a technician or an electrical system specialist take care of it.

Reference: Home and Garden website / Yello / BCC / Poonsincable

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