Electrical wiring plan and symbols
Electrical symbols are used on home electrical wiring plans in order to show the location, control point(s), and type of electrical devices required at those locations. These symbols, which are drawn on top of the floor electrical plan, show lighting outlets, receptacle outlets, special purpose outlets, fan outlets and switches.
Dashed lines are drawn between the symbols to denote which switches control specific lights or receptacles.
There are quite a few symbols used to represent the devices used in home electrical wiring but some of them are very similar, so care should be used when working with them!
An “outlet” is any point in an electrical system where current is taken out of the system in order to supply power to the attached electrical equipment. An outlet can be one of two basic types: A “Receptacle” outlet or a “Lighting” outlet.
A receptacle outlet is one in which one or more receptacles are installed for the purpose of attaching “plug and cord-connected” type devices, and a lighting outlet is one intended for a direct-wired connection to a lamp holder, luminaire (lighting fixture) or ceiling fan.
How electricity travels throughout the home?
Electricity is supplied to your home through your electric utility’s overhead or buried power lines. Before entering your home, electricity passes through a watt-hour meter which measures the amount of electricity used.
It then continues into your house through the Service Entrance Panel (also called a “load center”), where circuit protection devices such as circuit-breakers or fuses are located.
Figure 1 – Duplex receptacles
Electricity is then distributed throughout your home using branch circuits to provide power to appliances and lights through receptacles, switches, and fixtures. Electricity enters your house via two powered (“hot”) conductors and one non-powered (“neutral”) conductor. A typical voltage of 240 Volts AC will exist between the two “hot” conductors, while about 120 Volts will be present between either “hot” conductor and the “neutral” or “grounded” conductor.
See Figure 2.
Under appropriate conditions, 120 volts can cause harm or fatality; 240 volts pose an even higher danger of injury or electrocution.
A variety of testing instruments exist to detect voltage in a circuit, and one should be employed to ensure that the power is off. The discussion of these testing instruments will come later in this manual.
Figure 2 – Residential Electrical System
Electrical Symbols and Architectural Blueprints
Electrical symbols are utilized in residential architectural plans, creating unique electrical plan to indicate the position, control point(s), and type of electrical device(s) required at certain sites. The symbols depicted on the floor layout indicate lighting outlets, receptacle outlets, specialized outlets, fan outlets, and switches.
Dashed lines indicate which switch(es) operate certain light(s) or receptacle(s). Numerous symbols represent equipment in home wiring; nonetheless, some are remarkably similar, necessitating caution during their use.
Specialized outlets also exist. These may be allocated for a particular type of apparatus, such as a furnace, wall oven, waste disposal, or any comparable device.
| Title: | Basic guidelines to electrical wiring around your home – Perdue University |
| Format: | |
| Size: | 2.9 MB |
| Pages: | 38 |
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Thanks great, but can we see a version that suits modern centrally wired installations?
So that electricians and designs can discover just how much easier it is?
NO links between light fitting and switches, just a connection to show “groups”
All “light Switches” linked on the same data bus cable (no rules as to where or how they connect.
This all means that the “control point” for each light can be changed at will, as the building use evolves.
Please contact me directly for examples and a conversation.
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Why is 12v DC not use as control voltage in substations? Especially mv Substations.
24V and 48V DC are standard voltage levels for protection relay supply and control relays.
Mostly 110 volt Dc supply used. 24 volt & 48 volt also used. Main purpose is to reduced the current level & reduced the cable size too in protection circuit.
Can some one explain how 3rd harmonics are mitigated in Delta wound tertiary winding?
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