[Chai Jin cable tray to recommend the star product - bridge] bridge fire fire protection requirements of section cable tray standard, must use steel or non-combustible, fire-retardant materials. I produced a series of cable tray are BJⅢ fire bridge. V. Ground 1, the bridge system should have a reliable electrical connection and ground (only metal bridge). 2, when the system configuration should be allowed to use the bridge circuit grounding line meets the following requirements. Connection resistance between the ends of the bridge should be less than 0.00033 Ou Mutuo disc cable tray, grounding hole should remove the insulation coating. [Chai Jin cable tray to recommend the star product - the bridge] be well grounded grounded according to the specifications of the relevant provisions of trough cable tray, galvanized cable tray. (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. Fireproof cable tray | Anshun cable tray | cable tray manufacturers Tianjin Tianjin Chai Jin Chai Jin provided by cable bridge Limited. Chai Jin Tianjin cable bridge Limited (www.tjcjdlqj.com) strong, credible, in Tianjin metal building materials industry has accumulated a large number of loyal customers. The company better work attitude and constantly improving innovative ideas will lead Chai Jin cable tray and you hand into the brilliant, for a better future!