際際滷

際際滷Share a Scribd company logo

WIRES AND CABLES -building services t.y.b.arch.

Asawari Pandharpatte
Asawari Pandharpatte

by ar.A.S.PAndharpatte

1 of 14
Download to read offline
D.Y. PATIL COLLEGE OF ENGINEERING S.Y.B.ARCH BUILDING SERVICES-II Presented by-Prof. A. S. Pandharpatte DYPCOAT
WIRES AND CABLES Electrical wiring uses insulated conductors. Wires and cables are rated, by the circuit voltage, temperature and environmental conditions in which they are used. International Electro technical Commission is attempting to standardize wiring amongst member countries. Colour codes are used to distinguish wires- line, neutral and ground.
WIRES AND CABLES An electrical cable is made up of two or more wires, running side by side and bonded , twisted, braided together to form a single assembly , the ends of which can be connected to two devices, enabling the transfer of electrical signals from one device to another. Long distance communication takes place over undersea cables . Power cables are used for bulk transmission of alternating and direct current power, using high voltage cable.
WIRES AND CABLES Wire is a single electrical conductor, whereas a cable is a group of wires wrapped in sheathing . Whether indoors or outdoors, proper wire and cable installation is important to ensure smooth electricity supply . Each wire and cable should be installed carefully from the fuse box to the outlets , fixtures and appliances. The National Electrical Code (NEC) and Local Building Code regulate the manner of installation and the types of wires and cables for various electrical applications.
Size of wire according to BIS In India, wire sizes are typically specified according to the standards set by the Bureau of Indian Standards (BIS). The wire size is primarily determined by its cross-sectional area, which is specified in square millimeters (mm族). The commonly used size of wire according to BIS standards include: 1.0 mm族: This size is often used for lighting circuits and smaller loads. 1.5 mm族: Commonly used for general-purpose electrical wiring in homes and small installations. The current rating is around 10 amps 2.5 mm族: Suitable for higher current-carrying capacity applications, such as power outlets and larger loads. The current rating is around 16 amps 4.0 mm族 and above: Used for heavy-duty applications, industrial installations, and circuits with high current requirements. Current ratings are based on typical household wiring standards and may vary based on specific electrical codes and regulations in different regions.
Wire Lettering: The letters THHN, THWN,THW and XHHN, represent the main insulation types of individual wires. T Thermoplastic Insulation. H Heat Resistance HH High heat resistance (up to 194 degrees) W- Suitable for wet locations N- Nylon coating, resistant to oil / gas X Synthetic polymer that is flame resistant.
TYPES OF WIRES: 1) TRIPLEX WIRES: They are usually used in single phase service drop conductors, between the power pole and weather heads. They are made up of two, insulated aluminum wires, wrapped with a third bare wire which is used as common neutral. 2) MAIN FEEDER WIRES: They are the wires that connect, the service weather head to the house. They are made with stranded or solid THHN wire and the cable installed is 25 % more than the load required. TRIPLEX service drop cable
The current rating of a feeder is called the ampacity and the National Electric Code (NEC) requires that a 25% margin (to accommodate overloads) be applied when sizing conductors. The 25% margin is applied as follows: When a feeder supplies a combination of continuous and non- continuous nonmotor load, its ampacity shall not be less than 125% of the continuous load plus 100% of the non-continuous load. When a feeder supplies several motors, its ampacity shall not be less than 125% of the largest motor load plus 100% of the remaining motor load. When a feeder supplies a mixture of motor and non-motor load the two foregoing criteria should be applied to each component and their results summed.
WIRES AND CABLES -building services t.y.b.arch.
WIRES AND CABLES 3) PANEL FFED WIRES: They are black insulated THHN wire. These are used to power, the main junction box and circuit breaker panels. 4) NON METALLIC SHEATHED WIRES: Used in homes and have 2-3 conductors, each with plastic insulation and a bare ground wire. The individual wires are covered with another layer of non metallic sheathing.
WIRES AND CABLES 5) SINGLE STRAND WIRES: Also uses THHN wire, though there are other variants. Each wire is separate and multiple wires can be drawn together through a pipe easily. These wires are the most popular choice for layouts that use pipes to contain wires. TYPES OF ELCTRICAL CABLES: 1) NON METALLIC SHEATHED CABLE: They are known as NM cables. They feature a flexible plastic jacket with 2 or 4 wires and a bare wire for grounding.
WIRES AND CABLES 2) UNDERGROUND FEEDER CABLE: They are similar to NM cables but instead of each wire being individually wrapped in thermoplastic , wires are grouped together and embedded with the flexible material. They are water resistant. 3) METALLIC SHEATHED CABLE: Known as armoured or BX cables, they are used to supply mains electricity or for large appliances. They feature 3 plain stranded copper wires that are insulated with cross linked polythene, PVC bedding, and a black PVC sheathing. BX cables and steel wire sheathing are used for outdoor applications.
WIRES AND CABLES 4) UNSHIELDED TWISTED PAIR: (UTP cables) This type consists of two wires that are twisted together. The individual wires are not insulated which makes this cable perfect for signal transmission and video applications. They are used in telephones , security cameras and data network. 5) RIBBON CABLE: Used in computers and peripherals. Wires run parallel to each other on a flat plane. They can handle low voltage applications. 6) DIRECT BURIED CABLES: (DBCS ) Specially designed coaxial or bundled fiber optic cables, which do not require sheathing, insulation or piping, before being buried underground. They have layers of banded metal sheathing. Used for transmission or communication requirements.
WIRES AND CABLES TWIN LEAD CABLES: These are flat two wired cables that are used for transmission between an antenna , receiver like TV and radio. TWIN AXIAL CABLES: This is a variant of coaxial cables, which feature two inner conductors instead of one and is used for short range high speed signals. PAIRED CABLE: With two insulated conductors, this cable is normally used in DC or low frequency AC applications. TWISTED PAIR: The cable is similar to paired cables , but the inner insulated wires are twisted or intertwined.

More Related Content

WIRES AND CABLES -building services t.y.b.arch.

  • 1. D.Y. PATIL COLLEGE OF ENGINEERING S.Y.B.ARCH BUILDING SERVICES-II Presented by-Prof. A. S. Pandharpatte DYPCOAT
  • 2. WIRES AND CABLES Electrical wiring uses insulated conductors. Wires and cables are rated, by the circuit voltage, temperature and environmental conditions in which they are used. International Electro technical Commission is attempting to standardize wiring amongst member countries. Colour codes are used to distinguish wires- line, neutral and ground.
  • 3. WIRES AND CABLES An electrical cable is made up of two or more wires, running side by side and bonded , twisted, braided together to form a single assembly , the ends of which can be connected to two devices, enabling the transfer of electrical signals from one device to another. Long distance communication takes place over undersea cables . Power cables are used for bulk transmission of alternating and direct current power, using high voltage cable.
  • 4. WIRES AND CABLES Wire is a single electrical conductor, whereas a cable is a group of wires wrapped in sheathing . Whether indoors or outdoors, proper wire and cable installation is important to ensure smooth electricity supply . Each wire and cable should be installed carefully from the fuse box to the outlets , fixtures and appliances. The National Electrical Code (NEC) and Local Building Code regulate the manner of installation and the types of wires and cables for various electrical applications.
  • 5. Size of wire according to BIS In India, wire sizes are typically specified according to the standards set by the Bureau of Indian Standards (BIS). The wire size is primarily determined by its cross-sectional area, which is specified in square millimeters (mm族). The commonly used size of wire according to BIS standards include: 1.0 mm族: This size is often used for lighting circuits and smaller loads. 1.5 mm族: Commonly used for general-purpose electrical wiring in homes and small installations. The current rating is around 10 amps 2.5 mm族: Suitable for higher current-carrying capacity applications, such as power outlets and larger loads. The current rating is around 16 amps 4.0 mm族 and above: Used for heavy-duty applications, industrial installations, and circuits with high current requirements. Current ratings are based on typical household wiring standards and may vary based on specific electrical codes and regulations in different regions.
  • 6. Wire Lettering: The letters THHN, THWN,THW and XHHN, represent the main insulation types of individual wires. T Thermoplastic Insulation. H Heat Resistance HH High heat resistance (up to 194 degrees) W- Suitable for wet locations N- Nylon coating, resistant to oil / gas X Synthetic polymer that is flame resistant.
  • 7. TYPES OF WIRES: 1) TRIPLEX WIRES: They are usually used in single phase service drop conductors, between the power pole and weather heads. They are made up of two, insulated aluminum wires, wrapped with a third bare wire which is used as common neutral. 2) MAIN FEEDER WIRES: They are the wires that connect, the service weather head to the house. They are made with stranded or solid THHN wire and the cable installed is 25 % more than the load required. TRIPLEX service drop cable
  • 8. The current rating of a feeder is called the ampacity and the National Electric Code (NEC) requires that a 25% margin (to accommodate overloads) be applied when sizing conductors. The 25% margin is applied as follows: When a feeder supplies a combination of continuous and non- continuous nonmotor load, its ampacity shall not be less than 125% of the continuous load plus 100% of the non-continuous load. When a feeder supplies several motors, its ampacity shall not be less than 125% of the largest motor load plus 100% of the remaining motor load. When a feeder supplies a mixture of motor and non-motor load the two foregoing criteria should be applied to each component and their results summed.
  • 10. WIRES AND CABLES 3) PANEL FFED WIRES: They are black insulated THHN wire. These are used to power, the main junction box and circuit breaker panels. 4) NON METALLIC SHEATHED WIRES: Used in homes and have 2-3 conductors, each with plastic insulation and a bare ground wire. The individual wires are covered with another layer of non metallic sheathing.
  • 11. WIRES AND CABLES 5) SINGLE STRAND WIRES: Also uses THHN wire, though there are other variants. Each wire is separate and multiple wires can be drawn together through a pipe easily. These wires are the most popular choice for layouts that use pipes to contain wires. TYPES OF ELCTRICAL CABLES: 1) NON METALLIC SHEATHED CABLE: They are known as NM cables. They feature a flexible plastic jacket with 2 or 4 wires and a bare wire for grounding.
  • 12. WIRES AND CABLES 2) UNDERGROUND FEEDER CABLE: They are similar to NM cables but instead of each wire being individually wrapped in thermoplastic , wires are grouped together and embedded with the flexible material. They are water resistant. 3) METALLIC SHEATHED CABLE: Known as armoured or BX cables, they are used to supply mains electricity or for large appliances. They feature 3 plain stranded copper wires that are insulated with cross linked polythene, PVC bedding, and a black PVC sheathing. BX cables and steel wire sheathing are used for outdoor applications.
  • 13. WIRES AND CABLES 4) UNSHIELDED TWISTED PAIR: (UTP cables) This type consists of two wires that are twisted together. The individual wires are not insulated which makes this cable perfect for signal transmission and video applications. They are used in telephones , security cameras and data network. 5) RIBBON CABLE: Used in computers and peripherals. Wires run parallel to each other on a flat plane. They can handle low voltage applications. 6) DIRECT BURIED CABLES: (DBCS ) Specially designed coaxial or bundled fiber optic cables, which do not require sheathing, insulation or piping, before being buried underground. They have layers of banded metal sheathing. Used for transmission or communication requirements.
  • 14. WIRES AND CABLES TWIN LEAD CABLES: These are flat two wired cables that are used for transmission between an antenna , receiver like TV and radio. TWIN AXIAL CABLES: This is a variant of coaxial cables, which feature two inner conductors instead of one and is used for short range high speed signals. PAIRED CABLE: With two insulated conductors, this cable is normally used in DC or low frequency AC applications. TWISTED PAIR: The cable is similar to paired cables , but the inner insulated wires are twisted or intertwined.