Trystan Casey
In electrical wiring, the terms line and load refer to wires that deliver and carry power. Line refers to the wires that deliver power from the source to a device, while load refers to the wires that carry power onwards to other devices further along the circuit. When wiring low-voltage circuits, line refers to the parts of the circuit that are at full household voltage, while load describes the electrical demand or power draw that a device or appliance places on a circuit. In electrical blueprints, lines are used to indicate the route of wiring throughout a house, while symbols represent outlets, switches, and fixtures.
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What You'll Learn
Line and load wiring
The "line wire" is the wire that delivers power from the source to a device. It is the incoming electricity, always active, and carrying an electrical current. These wires are considered the "supply lines" of electrical power. Line wires are typically connected to the bottom terminal of a switch and are generally found lower than load wires. They are often black, but can also vary, and may be identified by a silver-coloured screw.
The "load wire", on the other hand, carries electricity from a terminal point to the point of use. It is the outgoing electricity, moving power to the next device on the circuit. Load wires are usually connected to the top terminal of a switch and are often found near the top of outlets and switches. They are typically red, black, or white, but the colour is not a reliable indicator.
It is important to note that the terms "line" and "load" are relative to the location of the device in the circuit. For example, in a series of outlets wired in sequence, the load wire feeds electricity from the first outlet to the remaining boxes, and the line wire for one outlet becomes the load wire for the next outlet downstream.
When working with line and load wiring, safety is paramount. Incorrect wiring can lead to short circuits, electrical shocks, or fires. If you are unsure about the wiring in your home, it is recommended to contact a professional electrician for assistance. They can provide guidance, ensure safe handling, and help prevent potential hazards.
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Electrical blueprint symbols
Some common electrical blueprint symbols include:
- Curving dashed lines: These indicate the rough route of wiring throughout a house. They are not meant to show the exact location of the wires but rather to give an idea of how the homeowner will interact with the switches and fixtures.
- Circle with two parallel lines extending from it: This represents a typical outlet or receptacle with two sockets.
- Circle with two angled lines extending from it: This represents a ceiling fan, with the lines symbolising the blades.
- Dollar sign or an "S": This is the symbol for a basic, single-pole switch.
- 3-Way Switch: This means there are two switches in the home that control the same item, typically a light or group of lights.
- 4-Way Switch: Similar to the 3-way switch, but with three switches controlling a light or group of lights.
- Double Pole Switch: Used to switch outlets and appliances on 240-volt circuits.
In electrical wiring, the terms "line" and "load" refer to the wires that deliver and carry power. The "line" is the wire that brings power from the source to a device, while the "load" carries the power onwards to other devices further along the circuit. Line and load have special meanings when wiring ground-fault circuit interrupter (GFCI) outlets, which have two pairs of screw terminals marked as LINE and LOAD.
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Line 1 and Line 2
In electrical systems, the terms "Line 1" and "Line 2" are used to refer to the power source and the device, respectively. The line is the wire that delivers power from the source to a device, while the load is the wire that carries power onwards to other devices further along the circuit. These terms are relative to the location of the device in the circuit, and the load wire for one device becomes the line wire for the next device downstream.
Line and load have special meanings when wiring ground-fault circuit-interrupter (GFCI) outlets. GFCI outlets have two pairs of screw terminals for connecting wires: one pair is marked "LINE", and the other is marked "LOAD". Connecting to both the line and load terminals provides GFCI protection for that outlet and other standard outlets located downstream on the same circuit.
In electrical blueprints, symbols are used to represent different components of the electrical system. For example, a circle connected to the wall by two parallel lines represents an outlet with two sockets. Ceiling fans are often represented by a circle with two angled lines extending from it, symbolising the blades of the fan.
In the context of electrical engineering, two vertical lines between the primary and secondary circuits can indicate a laminated iron core. This is seen in some very sensitive electronic loads, such as medical equipment, but most modern electronic loads do not require this.
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Overhead power lines
The electrical power transmission system of overhead lines enables electricity to be distributed nationwide, providing a seamless and speedy power supply to homes, workplaces, and other amenities. Overhead power lines are of two types: transmission lines and distribution lines. Transmission lines carry high-voltage 'primary' power between generators and substations, where transformers are used to 'step down' the voltage to a lower, safer level before public distribution. Distribution lines then carry this 'secondary' electricity supply to individual homes, businesses, and other premises for everyday use.
Conductors are components attached to power lines to facilitate the passage of electricity from one location to another and enhance safety. The four main types of conductors used in modern power lines are All Aluminium Conductors (AACs), All Aluminium Alloy Conductors (AAACs), Alloy Reinforced Aluminium Conductors (ACARs), and Steel Reinforced Aluminium Conductors (ACSRs). Insulators restrict power flow at defined points in an electrical network, reinforcing the structure and keeping conductors separated.
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Electrical wiring diagrams
Schematic Diagrams:
Schematic diagrams are the most common type, focusing on functionality and the flow of electrical circuits. They use standardized symbols to represent components and connections. These diagrams are like a roadmap, showing how the electrical system operates and how components interact. The lines between components on a schematic diagram represent two main types of wiring: factory wiring (solid line) and field wiring (dashed line). Factory wiring is done by the manufacturer, while field wiring is done by the technician. Color codes, such as BLK for black wiring and BLU for blue wiring, are also used to identify wires.
Ladder Diagrams:
Ladder diagrams, also known as ladder logic diagrams, are used to represent the flow of current in a circuit. They consist of two vertical power lines, typically labeled L1 and L2, with horizontal lines or "rungs" between them. Each rung represents a separate circuit within the electrical system. Symbols on these horizontal lines represent components within the circuit. Ladder diagrams are particularly useful for understanding complex electrical systems with multiple circuits.
MEP Plans:
MEP (Mechanical, Electric, Plumbing) plans are comprehensive diagrams that detail heating and air-conditioning systems, plumbing, electrical outlets and wiring, lighting, and other mechanical systems. Architects and builders use MEP plans to determine the placement of electrical elements, outlets, switches, and lighting fixtures. While builders don't need to understand every detail, they should be aware of how these systems operate and where wires and pipes will be located.
Symbolism and Variations:
Understanding Line 1 and Line 2:
In electrical systems, "Line 1" and "Line 2" are used to distinguish between different power sources or circuits. For example, in a 115/230 volt single-phase motor, Line 1 and Line 2 provide power, and the wiring diagram specifies which wires connect to each line. In another context, "line" and "load" refer to the wires that deliver power from the source to a device (line) and those that carry power to other devices along the circuit (load).
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Frequently asked questions
'Line' and 'load' refer to wires that deliver and carry power. 'Line' refers to the wires that deliver power from the source to a device, and 'load' refers to the wires that carry power onwards to other devices further along the circuit.
In electrical systems, line 1 and line 2 refer to the two power lines that provide power. For example, a 115/230 volt single-phase motor will have two lines providing power.
Two lines on a circuit diagram represent the two main types of wiring on a circuit: factory wiring and field wiring. Factory wiring is done by the manufacturer, while field wiring is done by the technician.
Two lines on a floor plan indicate the rough route of wiring throughout the house. These lines are not precise and an electrician will determine the exact placement of the wires.
Two lines between the primary and secondary in a circuit mean a laminated iron core.
