Building & Construction Cables
As an integral part of building electrics, wire and cable are used in a wide range of applications.
With the increasing electrical load in buildings, electrical fires caused by burning cables also occur frequently.
At the same time, once a fire occurs, the safe and reliable operation of fire-fighting equipment also requires the protection of wire and cable.
Therefore, the choice of building electrical wire and cable, is not only related to the normal use of electrical equipment.
But also related to the construction cost of building electrical, and more importantly, related to the safety of electrical use, and even the personal safety of the building personnel.
Commonly Used Wires and Cables for The Construction
1. Ordinary Cables
Mainly refers to polyvinyl chloride insulated wire BV wire and cross-linked polyethylene insulation(PVC insulation) polyvinyl chloride sheath insulated power cable YJV.
2. Flame Retardant Cables
Difficult to catch fire and can stop or retard the spread of flame wire and cable. The cable usually refers to the GB/T18380.3 (equivalent to IEC60332-3) test qualified wire and cable.
Including fire-retardant polyvinyl chloride insulated wire ZRBV wire and fire-retardant cross-linked polyethylene insulation polyvinyl chloride sheath insulated power cable ZRYJV.
3. Fire-Resistant Cables
At the specified temperature and time of flame burning, still, maintain the integrity of the line wire and cable. Usually refers to the GB/T12666.6 (equivalent to IEC60331) test qualified wire and cable.
Including fire-resistant polyvinyl chloride insulated wire NHBV line and fire-resistant cross-linked polyethylene insulation polyvinyl chloride sheath insulated power cable NHYJV.
4. Low-Smoke Zero Halogen Cable (LSZH Cables)
Halogen-free low-smoke flame retardant cable WDZ-BYJ/YJY: the material does not contain halogen, less smoke, and dust generated when burning, and can stop or delay the spread of flame wire and cable.
Usually can pass GB/T 17650.2 (equivalent to IEC60754-2), GB/T17651.2 (equivalent to IEC61034-2), and GB/T18380.3 (equivalent to IEC60332-3) three standard test qualified wire and cable called halogen-free low-smoke flame retardant wire and cable.
5. Mineral Insulated Cables
Mineral (such as magnesium oxide) is the insulation material of the cable. Usually composed of copper conductors, mineral insulation, and copper sheath does not contain organic materials.
And has non-combustible, smokeless, non-toxic, and fire-resistant properties.
The Selection and Laying Requirements of Wire and Cable In Residential Buildings
The selection of wire and cable in residential buildings, mainly concerning the “Residential Building Electrical Design Code” and “Civil Building Electrical Design Code” in the provisions.
1. Ordinary Load With Wire and Cable
1.2. And high-rise residential public areas of the ordinary load with cable, in the event of a fire is more likely to be delayed combustion, to reduce the risk to the building personnel, should use halogen-free low smoke flame retardant WDZ-BYJ / YJY cable and wire power supply.
1.3. Residential indoor lines are now concealed through the pipe, even in the event of a fire, the possibility of burning all the wires in a short period is small, the combustion of halide content and the impact of limited scope, so they can use BV wire concealed through the pipe.
2. Fire Load With Wire And Cable
2.2. The power supply trunk line of the fire fighting facilities at the first level should be mineral insulated cable BTTZ, which can be used as halogen-free low smoke and flame retardant WDZN-BYJ/YJY cable.
2.3. Emergency lighting using halogen-free low smoke flame retardant fire-resistant WDZN-BYJ/YJY cable.
2.4. Automatic fire alarm line adopts halogen-free, low smoke, flame retardant, and fire-resistant WDZN-BYJ/YJY cable. Concealed part can be used flame retardant fire-resistant ZNBV/YJV cable.
Distribution Line Laying Requirements
The choice of cable laying method should be selected according to the engineering conditions, environmental characteristics and cable type, quantity, and other factors, as well as to meet the principles of reliable operation, easy maintenance, and technical and economic rationality.
1. Requirements For Laying Fire-Fighting Distribution Lines
1.1. When laid in the open (including laying in the ceiling), metal conduit or closed metal channel box should be used for protection, metal conduit or closed metal channel box should take fire protection measures.
1.2. When using fire-retardant or fire-resistant cable and laid in the cable well, trench, may not wear metal conduit or use closed metal channel box protection.
1.3. When using mineral insulation class non-combustible cable, can be directly laid.
1.4. Concealed laying, should wear pipe and should be laid in a non-combustible structure and the thickness of the protective layer should not be less than 30mm.
1.5. Fire distribution lines should be laid separately from other distribution lines in different cable wells and trenches; when there are difficulties in laying in the same cable well and trench, they should be laid on both sides of the cable well and trench, and the fire distribution lines should be mineral insulated non-combustible cables.
2. Fire Prevention Measures For Cable Laying
2.1. wire and cable laying, cable bridges, and cable shafts should take effective fire blocking or separation measures.
2.2. Power wire and cable and non-power wire and cable should be laid separately, such as the need to lay in the same cable bridge, it is appropriate to take isolation measures.
2.3. laid in the same cable bridge cable, when its non-metallic material capacity is greater than 14L / m, it is appropriate to use isolation measures.
2.4. When the cable is laid openly, metal pipes or metal trunking should be used in special and first-class places, and metal pipes or metal trunking should be used in second-class places.
2.5. When the wire is concealed, it is appropriate to use metal pipe or fire-retardant rigid plastic pipe laying, and should be laid in a non-combustible body structure. Concealed laying of fire-fighting equipment lines, should also meet the requirements of its protective layer thickness should not be less than 30mm.
2.6. mineral insulated cables can be bracketed or laid along the wall.
In the building electrical design, first, we must fully understand the characteristics of wires and cables, and correctly distinguish the importance of the building, special features, and fire hazards. According to the different buildings, different parts, and different supporting equipment choose its corresponding wire and cable. The correct choice of wires and cables can not only meet the normal use of buildings and ensure the safety of personal property but also meet the building’s electrical energy saving and reasonable cost.
Service of ZMS Company
Over Productions Service
ZMS has a wide range of cable and conductor products for you to choose from. We will provide caring services and professional project solutions for everyone who needs them.
Quality Certification Services
ZMS cable products are manufactured according to GB, IEC, BS, NFC, ASTM, DIN, and other international standards. Our technical team can customize cable products that meet your requirements according to your need.
Profession Customer Service
ZMS provide free professional consulting services to provide you with one-stop project solution services and rapid product delivery solutions.
Delivery And Shipping Services
While we ZMS provide high-quality cables, we also provide good delivery solutions. While ensuring the safe delivery of products, we provide the best packaging and transportation solutions, greatly reducing customers’ transportation costs.
Packaging of ZMS
ZMS cables packaging are provided in the form of wooden reels, corrugated boxes and coils. The cable ends are sealed with BOPP self-adhesive tape and a non-hygroscopic sealing cap to protect the cable ends from moisture. We can print the required marks on the outside of the barrel with waterproof material according to customer requirements.