Summary

　　YFD series cable branch joints are in high-rise buildings and roads, bridges, tunnels below 1KV with trunk line cable and the split power meter, power distribution control box of the branch lines in the predetermined position, according to the required length and number of the connection, the connecting part of all processing and related facilities are in the factory processed: and the power transmission line system of related tests. The cable shunting system widely used in high-rise buildings within the district supply mains, split building supply line, square lighting power supply lines, street lamp power supply lines, metro power lighting, tunnel lighting mains power supply route and so on, especially suitable for the air contains large amounts of environment conductive composition and easy to corrosion and other harsh and the construction conditions of complex cases, divided up system of product YFD series cable, to create a low voltage power distribution construction labor saving, low cost, high performance and reliable wiring, system of zero fault, maintenance free new era. It is waterproof, sealing, contact resistance, insulation resistance, thermal stability and other properties were lower than those of normal cable and plug connected bus "T".
 

　　Classification of types of meaning

　　1, YFD-ZR-YJV-4 (1 * 240) /4 * (1 * 25), flame retardant XLPE insulated PVC sheathing type, main cable is 1 x 240, 1 x 25 cable branch cable shunting system.

　　2, YFD-YJV-4 * (1 * 240) /4 * (1 * 25), ordinary XLPE insulated PVC sheathing type, main cable is 1 x 240, 1 x 25 cable branch cable tapping system.

　　3, YFD-NH-YJV-4 * (1 * 240) /4 * (1 * 25), fire-resistant XLPE insulated PVC sheathing type, main cable is 1 x 240, 1 x 25 cable branch cable shunting system.

　　4, YFD-VV-4 * (1 * 240) /4 * (1 * 25), common PVC insulation sheathing type, main cable is 1 x 240, 1 x 25 cable branch cable shunting system.

　　5, YFD-ZR-VV-4 * (1 * 240) /4 * (1 * 25), PVC insulated and sheathed flame retardant type, main cable is 1 x 240, 1 x 25 cable branch cable shunting system.

　　6, YFD-NH-VV-4 * (1 * 240) / (4 * 1 * 25), PVC insulated sheathed fire type, main cable is 14 * (1 * 25), PVC insulated fire resistant type, main cable is 1 x 240, 1 x 25 cable branch cable shunting system.

　　The main performance

　　1, waterproof performance: namely branches is immersed in water, do frequency test, and the insulation resistance test, can be through.

　　2, power frequency withstand voltage: 3.5kv/5min no breakdown within the.

　　3, insulation resistance than 200M omega.

　　4, the contact resistance of not more than 1.2 times and splitter equal branch line of the reference resistance.

　　5, thermal stability: branch device from the connection of influence of expansion and contraction parts.

　　6, the minimum bending radius: R=2D. R is the radius of curvature, D as the outer diameter of cable.

　　7, the highest temperature of conductor long: crosslinking type 90 C 70 C, the general type.

　　8, the installation distance: arranged parallel to the cable center distance is 2 times of the cable diameter, wring type installation can contact each other, wring internodes of not less than 50 times of the cable diameter (multi core cable not used).

　　9, the laying of the environment temperature is not lower than 0 DEG C, such as lower than 0 DEG C by preheating method.

　　Design selection description

　　(a) selection description:

　　Lighting 1, generally place or equipment and power transmission lines system, ambient temperatures average 35 degrees below, choose the "VV" type and "ZR-VV" type.

　　2, the fire lighting requirements of the premises or equipment and power transmission lines system, ambient temperatures average above 35 degrees, use "YJV" or "ZR-YJV" type.

　　3, the fire mains system has special requirements or fire fighting equipment used "NH-VV" or "NH-YJV" type.

　　(two) specification selection:

　　1, first on each floor of the user's electricity load calculated that the total load, floor, according to the load flow parameters found branch section, then according to the total floor load calculate calculate trunk section, (Note: if the total load calculated is greater than 1605A, can use zoning power or cross power supply scheme, the general situation as far as possible the use of partition power supply scheme, the cable cross-section decreases, can reduce an investment. )

　　2, a design example:

　　Example: a 24 storey building, every 12 households, each household electricity consumption is 4KW. Each layer of the electricity consumption of households for 12 * 4KW=48KW, 0.8 power factor, the actual electricity consumption is 48 * 0.8=38.4KW, a synchronous coefficient 0.9, while electricity consumption is 38.4 * 0.9=34.5KW, then calculate the current is 90A, plus a safety factor of 30%, i.e. 90 x 1.3=118A; such as the selection of the "YJV" column installation, the branch line according to the table is found for 16mm 2, such as the 8 layer is a number, then the total current of 8 layer 944A; such as cable used "YJV" type arrangement, the main trunk line according to the table found for 500 mm 2, so the building of transmission route for the 1~8 layer, 9~17 layer, 18~24 layer of each one the loop of YFD-YJV-4 * (1 * 500) /4 (1 * 16) *.

　　Operating conditions

　　(a) "VV" type power cable operation conditions:

　　1, the highest for the cable core allowed working temperature of 70 DEG c;

　　2, the laying of the environment is not lower than 0 DEG c;

　　20, bending radius of not less than 3 times of cable diameter.

　　(two) "YJV" type power cable operation conditions:

　　1, the cable core allows long-term work of the highest temperature is 90 c;

　　2, the laying of the environment temperature is not lower than 0 DEG c;

　　20, bending radius of not less than 3 times of cable diameter.

　　YFD series cable tapping system installation

 

　　(a) the size of the reserved hole arranged in the vertical (see below)

　　(two) preparation before installation work

　　1, the shaft within the Tao will clean up garbage;

　　2, the top hoist on the need for safety cable and fixed;

　　3, the reliable cable placed on the wire rack;

　　4, the mounting bracket fixed firmly on both sides of each branch coupler;

　　5, the top of the cross arm and the cross arm bracket is arranged at the same side with the installation of cable on the wall.

　　(three) installation

　　1: when using the way of lifting, hoisting, first will hoist installed, then use the hanging head, the wire rope main cable to the top hoist start lifting, lifting each layer must stand a person, in order to prevent the branch sheathing by preformed hole hindrance and injury. Hanging to the top after the hanging head wear to the hook groove, by a bolt through the hook and hanging installation holes on the head, to the appropriate location with hook nut to adjust the branch point height.

　　2, set: the set mode, first in order to put forward to the manufacturing plant, in the factory when the reverse winding winding cable. The first full disk (volume) cable all hung to the top, the whole disk cable must have a brake device, then each layer of station one slowly cable down, into the position after the hanging head is hanging on the hook, the adjustment of the branch point position.

　　3, whether by lifting or set, in 8 hours after all hung well within the main cable is fixed on the mounting frame. And then we can unravel the branch cable, branch cable as required in bending, bending on both sides need to have the installation bracket is fixed.

　　The minimum bending radius is 4, the cable bending for R=20D, D for the outer diameter of cable.

　　5, when the environment to 0 DEG C, not laying of cable, if necessary, the cable can be preheated by the rear can be laid.

　　(three) installation notes:

　　Before 1, completion of the installation of electricity, must use 1000V megohmmeter, insulation resistance between measured hanging head and the cable core, such as insulation resistance of less than 100M ohm, to inform the manufacturers to carry out inspection.

　　2, check the end head phase mark with the branches phase markers are corresponding, check and correct side Ketong electric.

　　3, directly buried installation, buried depth is less than 0.5m.

　　Service

　　1, the pre-sale service, before business consensus sign covariance debate, the company can send technicians to assist Party A to do relevant technical scheme and installation scheme etc..

　　2, after sale service, business transactions after the arrival of the goods, the company sent technical personnel to the site to guide the installation, the province within 24 hours, 48 hours arrive in other provinces.

　　Service

　　1, the pre-sale service, before business consensus sign covariance debate, the company can send technicians to assist Party A to do relevant technical scheme and installation scheme etc..

　　2, after sale service, business transactions after the arrival of the goods, the company sent technical personnel to the site to guide the installation, the province within 24 hours, 48 hours arrive in other provinces.

　　Ordering instructions

　　In order to can according to customer needs, provide YFD series cable qualified tap system series products, so that customer satisfaction, please provide the following information:

　　1, system diagram, floor high profile, the main cable and the branch length, branch connection layout model;

　　2, the floor distribution box from the floor height and feed line;

　　3, installation accessories type, specification and quantity;

　　4, installation, arrangement or lifting (from the ground to pull or the roof pulled);

　　5, upper supporting: with or without a cable clamping device or suspension insulation device;

　　6, described in other projects.