Henan InfoQuick bridge voltage electrical equipment Co., Ltd. (www.jtqiaojia.com) is located in the Economic Development Zone of Zhengzhou, Henan Zhengzhou clouds technical Temple office, Contact: Mr. Wang distribution box, shaft cable trays, slotted cable tray cable tray installation Just InfoQuick bridge, tray cable tray, Ladder type cable tray, DJ-type large span cable tray, CABLOFIL mesh cable tray, hot dip galvanized cable trays, stainless steel cable tray, aluminum cable tray, room alignment tray, FRP cable tray, CSP alloy plastic cable tray, cable tray installation - Henan InfoQuick bridge voltage electrical equipment Co., required shielding cable network or electrical interference protective external (eg: there etchant Hugh, combustible dust and other environmental ) when the impact of cable tray installation requires custom phone should be used (FB) class trough composite corrosion shielded cable tray (with lid) 2, corrosive environments should be used (F) composite epoxy corrosion retardant cable bridge. Corbel, bracket, but also the choice of the same material, improve the life of the bridge and what accessories install cable tray, cable tray. Easy to fouling and the need to cover environmental or other outdoor venues should be stamped plate. 3, in addition to the above, according to the site environmental and technical requirements are also optional tray, trough, stepped glass corrosion retardant cable tray or steel ordinary type bridge. Easy to fouling and the need to cover environmental or other outdoor venues should be stamped plate. 4, or outdoors in a public passage across the road segment, the bottom rung of the bottom plate or tray should be added in this section. Public access across a large span of time, can increase the load capacity of the bridge or optional rack rows according to user requirements. 5, large span (> 3m) to choose composite bridge (FB). 6, Outdoor refers to the choice of composite epoxy resin tray (F). Distribution boxes, cable tray vertical shaft, trough cable tray, tray cable tray, Ladder type cable tray, DJ-type large span cable tray, CABLOFIL mesh cable tray, hot dip galvanized cable trays, stainless steel cable tray, aluminum alloy cable tray, room alignment bridge, FRP cable tray, CSP alloy plastic cable tray, cable tray installation - Henan InfoQuick bridge voltage electrical equipment Co., Ltd. (1) galvanized cable trays each plate bolts directly contact resistance should be less than 0.005 Ω, this time as a grounding cable tray trunk (dusting cable trays are not suitable for grounding line), the value of each resistor cable tray can be calculated as: r = ρ · L / S where: ρ = 15 × 10Ω- 6 / cm (20 ℃); L = length calculated by 100mm; S = cross-sectional area cm2. (2) ladder in the tray unit resistance values ??in Table 2. Table 2 ladder resistance value in units of pallets (3) cable trough units resistor values ??shown in Table 3 (4) When the cable tray installation and connection process as a whole after each ladder side (or each cable trough) of resistance: R = L (r +1 / 3r ') wherein: R - ladder side, i.e. (cable channel) Full total resistance (mΩ); r - resistance per unit length of the edge gradient (mΩ / m) r'- Direct plate fixing bolts contact resistance.