Company News

• Chinasky New Product - Ethernet Switches

  2023 / 03 / 06

  Chinasky New Switches are coming! More competitive prices!! Contact our sales team to know more! E

• Chinasky Tips on the Evaluation of Power Loss of Power Extension Cables

  2023 / 02 / 15

  In CCTV application, power extension cables are commonly seen to be used with power adapter 12V5A or 12V3A. Sometimes our customers find it difficult to decide which adapter, which awg of cable or which length of cable to use in consideration of power loss to different extent on cables of different specification. Here Chinasky would like to share with you our thoughts on how to evaluate the power loss. The resistance value for 18awg cable is 0.0214Ω/m. The resistance value for 20awg cable is 0.0339Ω/m. Power(P)=I(Current)²*R(Resistance) Therefore, theoretically we can calculate the value of power loss if we assume the current(I) is the full-load value: 5A with 12V5A adapter, and 3A with 12V3A adapter. 1. 12V5A adapter + 20awg DC extension cable: 10feet: 3.05m, power loss is 0.0339x3.05x5²=2.59W 20feet: 6.1m, power loss is about 5.17W 30feet: 9.15m, power loss is about 7.76W 2. 12V5A adapter + 18awg DC extension cable, power loss for: 10feet: 1.63W 20feet: 3.27W 30feet: 4.9W 3. 12V3A adapter + 20awg DC extension cable, power loss for: 10feet: 0.93W 20feet: 1.87W 30feet: 2.8W 4. 12V3A adapter + 18awg DC extension cable, power loss for:

• Chinasky Tips on the Use of Power Splitters

  2023 / 02 / 08

  Power splitter cables (1 to 4 way, 1 to 6 way, or 1 to 8 way) are commonly seen in CCTV applications used with power adapters and cameras. Different cable sizes can be found on the market, 18AWG, 20AWG, 22AWG, 24AWG, etc. Sometimes our customers might wonder: with all the different specifications, how to pick the AWG size we actually need and how to connect the splitters correctly and safely with cameras? Here are a few tips we`d like to share in the case of use with 12V5A and 12V3A power adapters. 1. The AWG size of output DC cords of the adapters on the market are generally as below: 12V5A ---18AWG or 20AWG output dc cord 12V3A ----22AWG output dc cord Therefore, if used with a 12V5A adapter, it's more recommended to use 20AWG main cable or cable with bigger size. If used with 12V3A adapters, 22AWG is also ok to use. 2. How to determine the maximum Watt the main cable can withstand and the maximum Watt each splitter cable can withstand? We will answer the question with the example of the splitter (main cable 22awg+splitter cable24AWG): ---If used with 12V5A power adapter, for 4 way splitter: Main 22AWG: allow current 0~3A; power 0~36W. Spliitter 24AWG: each allows current 0~2A, power 0~24W, four splitter cables together: 0~3A, 0~36W. For instance, if power of channel 1 is 5W, power of channel 2 is 6W, power of channel 3 is 12W, power of