Wiktor Wise
Electrical symbols are used to communicate the location of electrical devices to electricians. While each engineering office has its own set of symbols, some are more common than others. For example, a circle with two parallel lines connecting it to a wall represents a typical outlet or receptacle with two sockets. This symbol can be annotated with abbreviations and numbers to provide additional information, such as GFCI, which stands for a ground-fault circuit interrupter, or 220, which indicates a 220-volt outlet. Symbols are often accompanied by a legend sheet that explains their meaning.
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What You'll Learn
A circle with two parallel lines represents a typical outlet or receptacle
The symbol consists of a circle that is offset from the wall and connected to it by two parallel lines, representing a typical outlet or receptacle with two sockets. Abbreviations and numbers next to this symbol can provide additional information. For example, "GFCI" indicates a ground-fault circuit interrupter, which is an outlet with a built-in circuit breaker that prevents electric shocks and is typically used near water sources, such as in bathrooms and kitchens.
The number "220" next to the symbol indicates a 220-volt outlet, commonly used for appliances requiring higher voltage, such as ovens and dryers. A square around the symbol indicates a floor receptacle, and a ceiling fan is often represented by a circle with two angled lines extending from it, symbolizing the blades.
It's important to note that while these symbols are commonly used, each engineering office may have its own set of electrical symbols. Therefore, it's always a good idea to refer to the legend sheet in your set of plans to understand the specific symbols used in a particular set of drawings.
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GFCI indicates a ground-fault circuit interrupter outlet
A circle off the wall and connected to it by two parallel lines represents a typical outlet or receptacle with two sockets. GFCI stands for ground-fault circuit interrupter and is a safety device that helps protect against electrical accidents at electrical outlets. GFCI is denoted by the symbol 'GFCI' on electrical blueprints.
GFCI outlets are used in kitchens, bathrooms, and anywhere electrical devices can come into contact with water. They are designed to prevent electric shocks and electrocution. GFCI protection is essential because tap water and wet objects can easily conduct electricity, increasing the risk of electrical shock.
GFCIs work by sensing the difference in the amount of electricity flowing into and out of a circuit, even in small amounts of current. If a ground fault is detected, the GFCI will quickly trip or shut off the circuit to prevent electrical accidents. This reaction occurs in less than one-tenth of a second, helping to keep people safe from potential shocks and electrocution.
GFCIs are available in different types, including receptacle-type GFCIs, which are similar to common wall outlets, and portable-type GFCIs, which are designed for easy transport and can be plugged into existing non-GFCI outlets. It is recommended to test GFCIs monthly to ensure they are functioning correctly.
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A square around a duplex or quad indicates a floor receptacle
The electrical symbol for a receptacle, or 'outlet', varies depending on the type of receptacle and the engineering office that designed the symbol. A circle connected to a wall by two parallel lines typically represents a standard receptacle with two sockets. This symbol may also include abbreviations such as 'GFCI' to indicate a ground-fault circuit interrupter, or a number like '220' to indicate a 220-volt outlet.
However, a square around a duplex or quad receptacle indicates a floor receptacle. A duplex outlet has two sockets, while a quad has four. This square symbol is distinct from the standard outlet symbol, which features a circle.
It's important to note that while the terms 'outlet' and 'receptacle' are often used interchangeably, they have distinct meanings in electrical code. An 'outlet' refers to any point where something can be connected, including lights and switches, which have their own unique symbols.
These symbols are used on drawings and blueprints to communicate the location of specific devices to electricians. They are typically listed in a legend for easy reference.
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A dollar sign or an 'S' is the symbol for a switch
When reading electrical plans, it's important to note that every engineering office uses its own set of symbols. However, some symbols are more common than others and are used across many offices. One such common symbol is that of a switch, which is often represented by a dollar sign ($) or a simple 'S'. This symbol usually indicates a single-pole switch, the most basic type of switch, although there are many other types used in contemporary homes.
The symbol for a switch is just one of many electrical symbols that builders must know. For instance, a circle connected to a wall by two parallel lines represents a typical outlet or receptacle with two sockets. If this symbol is accompanied by the abbreviation GFCI, it indicates a ground-fault circuit interrupter, a type of outlet with a built-in circuit breaker that prevents electric shocks and is often used near water sources, such as in bathrooms and kitchens.
A square around a duplex or quad outlet indicates a floor receptacle. Additionally, the number 220 next to an outlet symbol denotes a 220-volt outlet, commonly used for high-voltage appliances like ovens and dryers. Ceiling fans are often represented by a circle with two angled lines extending from it, resembling blades.
While these symbols are commonly used, it's always a good practice to refer to the legend sheet provided with a set of plans to ensure accurate interpretation of the specific symbols used in that set. This is especially important when encountering more specialized or less commonly used electrical symbols.
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OH is the symbol for a single-gang duplex receptacle
The symbol used to represent a receptacle in electrical drawings varies. While some drawings use the abbreviation 'Recep' or the full word 'receptacle', others use ''OH' as the symbol for a single-gang duplex receptacle. This symbol is used by electricians on drawings or studs to communicate the location of this type of device. It is not typically used on panel schedules, as this would not be understood by the average homeowner.
A receptacle is technically distinct from an 'outlet' or 'plug', although these terms are often used interchangeably. An outlet can refer to any point that something can be connected, including lights and switches, which have their own symbols.
A typical outlet or receptacle with two sockets can be represented by a circle off of the wall, connected to it by two parallel lines. Additional information may be provided through abbreviations and numbers next to the symbol. For example, ''GFCI' indicates a ground-fault circuit interruper, and '220' indicates a 220-volt outlet.
It is important to note that every engineering office may use its own set of electrical symbols, but certain symbols are commonly used across many offices.
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Frequently asked questions
A circle off the wall and connected to it by two parallel lines represents a typical outlet (or receptacle) with two sockets. This symbol is commonly used across many engineering offices.
GFCI stands for ground-fault circuit interrupter. It is an outlet with a built-in fast-acting circuit breaker that prevents electric shocks. These are typically used with outlets near water, such as in bathrooms and kitchens.
Yes, there are different types of receptacles, including single-gang duplex receptacles and quad receptacles, which have four sockets.
