[Chai Jin cable tray to recommend the star product - the bridge] in accordance with the relevant provisions of the grounding cable tray manufacturer specifications, galvanized cable tray good grounding. (1) Each of galvanized cable tray plate bolts directly contact resistance should be less than 0.005Ω, this time as a cable tray grounding line (dusting cable trays are not suitable for grounding line), the value of each resistor type cable tray press calculated: r = ρ · L / S where: ρ = 15 × 10Ω-6 / cm (20 ℃); L = length calculated according to 100mm; S = cross-sectional area cm2. [Chai Jin cable tray to recommend the star product - Bridge] If the different levels of cable laying in the same cable tray, the middle partition should be increased isolation. 1.8 When the steel line segment length exceeds 30m, while aluminum cable bridge over 15m. Or when the cable tray after construction should stretch (settlement) seam allowance leaving O-30mm compensation. Its retractable connector plate connection should be used. 1.9 cable ladder, tray width and height should be chosen to meet the requirements of the filling factor, cable ladder, under normal circumstances tray fill rate of cable tray, power cable desirable 40% -50%, 50% preferred the control cables . 70%. L0% and should be reserved for a 252 project development margin. 1.10 In selecting cable tray load rating if the actual span cable tray hanger is not equal to 2m when. The work uniform load should be met: where qG ---- Work uniform load cable tray fire, kN / m; qE ---- rated uniformly distributed load, kN / m; LG ---- actual span, m. Rated bridge uniform load rating in Table 1. [Chai Jin cable tray to recommend the star product - Bridge] cable tray installation should pay attention on the cable tray installation Some explanations should be noted: (1) visual inspection of the construction site into the cable tray cable tray price, shall be submitted. The following information products factory certification, provincial and municipal quality supervision station cable tray sheet thickness periodic inspection report and related technical appraisal documents should meet the requirements. Galvanized cable tray surface coating should be uniform, without over-burning, hanging gray, not galvanized local defects. Electrostatic spray should be smooth, uniform, can not afford to skin, no bubbles, blisters on the bridge itself should be smooth, no distortion, wall should be smooth, no glitches bridge weld surface should be uniform, not tainted welding, crack, burn, etc. defects. Cable tray price, Hechi cable tray, cable tray corporate integrity Chai Jin (view) from the Tianjin Chai Jin cable bridge Limited. Road Zhiyuan, temper forward. Chai Jin Tianjin cable bridge Limited (www.tjcjdlqj.com) strives to be and you win, symbiosis, strategic partners to move forward, the more determined to become the most influential metal building materials business, and you leap together to success!