Bv wire Full name copper core Pvc Insulated Wire, that is, general purpose single-core hard conductor unsheathed cable, which is the common insulated wire and home-made wire used in our daily life, is the most commonly used wire type. It has the characteristics of acid and alkali resistance, oil resistance, moisture resistance and mildew resistance. Bv Cable,Plastic Copper Wire,Bv Electric Cable,Pvc Insulated Bv Cable Jiangsu QiSheng Cable Co., Ltd. , https://www.shuaihe-cable.com
The announcement pointed out that the test standards specified in the "Electrical and Electronic Products Compulsory Certification Implementation Rules Lighting Equipment" increase GB7000.4 "Lamps Part 2-10: Special Requirements for Children's Portable Lamps". For portable luminaires for children, product safety testing shall be carried out in accordance with GB7000.1 and GB7000.4. 
The formula of the area of the circle: radius × radius × 3.14 (pi).
BV monofilament diameter and number
BV monofilament diameter and number
For example, BV2.5, the national standard diameter is 1.78mm, and the radius is 0.89mm.
Therefore, the cross-sectional area is: 0.89 × 0.89 × 3.14 = 2.487194 is approximately equal to 2.5 mm & sup 2; / square mm.
The following analogy, 1-6 squares are single core diameter, more than 10 squares for multicore
Recently, the National Certification and Accreditation Administration issued a notice to announce the compulsory certification requirements for portable lamps for children.
BV monofilament diameter and number