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Can you put a GFCI into a circuit with an existing GFCI and what will happen if the two GFCIs are in a series circuit?
Note: The latest types of Ground Fault Circuit Interruptor (GFCI) are also called Residual Current Devices (RCDs).
"Can you put a GFCI into a circuit with a GFCI?" is probably the same question as "What if two GFCI are in series in a circuit?" and the answer is that one GFCI will most likely trip earlier than the other to break the circuit. Which one will trip first depends on the actual difference in sensitivity between the two GFCIs. Leakage currents are measured in mA (1 mA = 1 thousandth of an Ampere) and GFCIs are designed to trip at a certain leakage current with a tolerance of say + or - 3%. So if the basic trip current was 20 milliamps one GFCI might trip at 19.4 mA and the other at 20.6 mA and they would both be within the design specification. The one that trips at 19.4 mA would be expected to trip first. <><><> This question requires answering by a VERY knowledgeable electrician, or an electrical engineer. I am neither, but until the right answer comes along, I will attempt to provide some information which hopefully will allow a better understanding of the issues involved. A GFCI [ground fault circuit interrupter] is much different from, although similar to, a circuit breaker. The DIFFERENCE is WHAT they are designed to detect and react to. The purpose of a fuse or circuit breaker is to detect excess or MASSIVE current flow [ie. a SHORT CIRCUIT, a direct short to ground], and then very quickly turn off the electrical current to the circuit, in order TO PREVENT a FIRE. This is the only thing the breaker is designed and intended to do. This limited capability will not prevent a person from being electrocuted when a fault occurs within an electrical device, if the current flow happens to be low. Voltage and current faults which can kill a person usually will not be detected by a circuit breaker. A ground fault circuit interrupter [GFCI], on the other hand, is designed to, and will, detect those low level currents which can kill a person, BUT which are not great enough to trip a breaker. When a GFCI detects potentially dangerous current it, like a breaker, trips in order to open the circuit. Now as to WHY, when you placed two GFCIs in series [one in the breaker panel feeding one in an electrical receptacle], the first GFCI tripped when the second GFCI is "tested." When you press the TEST BUTTON on a GFCI it puts a high resistance load on the circuit, which simulates a "small" ground fault, and I think both GFCIs "see" the same fault and react as designed and intended. Again, a true professional should "bless" my comments, but I think that there is no danger or hazard in placing two GFCIs in series. On the contrary, I think there is redundant capability in the pairing, with the first GFCI functioning with, and as a backup to, the second. I suggest you contact your local electrial inspection department regarding what the code(s) say about this issue, and also call the tech support people at the 800 number on the packaging for the GFCIs. Another source of information is a local electrical engineer, if you know someone who can help you make contact. Until a more informed answer comes along, I hope this helps you to understand the issues involved. <><><>
As always, if you are in doubt about what to do, the best advice anyone should give you is to call a licensed electrician to advise what work is needed.
Before you do any work yourself,
on electrical circuits, equipment or appliances,
always use a test meter to ensure the circuit is, in fact, de-energized.
IF YOU ARE NOT ALREADY SURE YOU CAN DO THIS JOB
SAFELY AND COMPETENTLY
REFER THIS WORK TO QUALIFIED PROFESSIONALS.
What else can I help you with?
Why do gfcis trip?
GFCIs can trip due to a ground fault, which occurs when electricity leaks from the circuit. This can happen if water or moisture gets into outlets, there is a wiring issue, or there is a fault in an appliance. Tripping is a safety feature that cuts off electricity to prevent electric shocks and fires.
Why would turning off a switch trip a GFCI on the same circuit?
Turning off a switch can trip a GFCI (Ground Fault Circuit Interrupter) on the same circuit if it disrupts the flow of current and creates an imbalance between the hot and neutral wires. GFCIs monitor the current flowing through these wires, and if they detect a difference, which can happen when the circuit is interrupted, they will trip to prevent electrical shock. Additionally, if the switch is faulty or wired incorrectly, it might cause a ground fault that triggers the GFCI to trip.
What are the three devices that should include a ground fault circuit interrupter?
Three devices that should include a ground fault circuit interrupter (GFCI) are bathroom outlets, kitchen outlets, and outdoor outlets. These locations are prone to moisture exposure, which increases the risk of electrical shock. Installing GFCIs in these areas helps protect users by cutting off electricity when a ground fault is detected. Additionally, GFCIs are often required by electrical codes for safety.
Do you need GFCI protection in kitchen?
Yes, it is recommended to have Ground Fault Circuit Interrupter (GFCI) protection in a kitchen. GFCIs help prevent electric shock by quickly shutting off power in the event of a ground fault or short circuit. They are typically required for outlets near sinks, countertops, and areas prone to moisture.
What safety devices that stop the flow of electric currents?
There are two types. A fuse is a piece of wire that is thinner than the circuit it is placed in series with. Any excessive current causes the fuse to melt and this cuts off the power. The fusing current is somewhat unpredictable. A circuit-breaker is a resettable device that can be set to interrupt the supply at a fixed amount of current.
Why do gfcis trip?
GFCIs can trip due to a ground fault, which occurs when electricity leaks from the circuit. This can happen if water or moisture gets into outlets, there is a wiring issue, or there is a fault in an appliance. Tripping is a safety feature that cuts off electricity to prevent electric shocks and fires.
Do GFI's go bad over time?
Yes, Ground Fault Circuit Interrupters (GFCIs) can go bad over time due to wear and tear, exposure to moisture, or electrical surges. It is recommended to test GFCIs regularly and replace them if they are not functioning properly.
Do gfcis protect receptacles upstream or dowstream?
Ground Fault Circuit Interrupters (GFCIs) protect downstream receptacles. This means that any electrical devices or outlets connected after the GFCI in the circuit are protected from ground faults. If a ground fault occurs, the GFCI will trip and cut off power to all downstream devices, helping to prevent electric shock. However, it does not provide protection to receptacles located upstream of the GFCI.
Why would turning off a switch trip a GFCI on the same circuit?
Turning off a switch can trip a GFCI (Ground Fault Circuit Interrupter) on the same circuit if it disrupts the flow of current and creates an imbalance between the hot and neutral wires. GFCIs monitor the current flowing through these wires, and if they detect a difference, which can happen when the circuit is interrupted, they will trip to prevent electrical shock. Additionally, if the switch is faulty or wired incorrectly, it might cause a ground fault that triggers the GFCI to trip.
What are the three devices that should include a ground fault circuit interrupter?
Three devices that should include a ground fault circuit interrupter (GFCI) are bathroom outlets, kitchen outlets, and outdoor outlets. These locations are prone to moisture exposure, which increases the risk of electrical shock. Installing GFCIs in these areas helps protect users by cutting off electricity when a ground fault is detected. Additionally, GFCIs are often required by electrical codes for safety.
What are the different types of Square D breaker types available for residential electrical systems?
The different types of Square D breaker types available for residential electrical systems include standard circuit breakers, ground fault circuit interrupters (GFCIs), arc fault circuit interrupters (AFCIs), dual function circuit breakers, and combination arc fault circuit interrupters (CAFCIs).
What are the different types of breakers used in a breaker box?
The different types of breakers used in a breaker box include circuit breakers, ground fault circuit interrupters (GFCIs), and arc fault circuit interrupters (AFCIs). Each type serves a specific purpose in protecting the electrical system and preventing hazards like electrical fires and shocks.
What devices are used to protect people from an electric current?
Electrical devices such as circuit breakers, fuses, and ground fault circuit interrupters (GFCIs) are commonly used to protect people from electric currents. Additionally, electrical insulation, such as rubber gloves and mats, can prevent electric shocks in specific situations.
Why is a GFCI not used everywhere?
GFCIs (Ground Fault Circuit Interrupters) are not used everywhere primarily due to cost considerations, code requirements, and the specific risk factors associated with different environments. While they provide crucial protection against electrical shocks in wet or damp areas, such as bathrooms and kitchens, their installation in every outlet would increase overall electrical system costs and complexity. Additionally, some standard outlets in dry areas may not require the same level of protection, making GFCIs unnecessary. Building codes vary by region, influencing where GFCIs are mandated.
Do you need GFCI protection in kitchen?
Yes, it is recommended to have Ground Fault Circuit Interrupter (GFCI) protection in a kitchen. GFCIs help prevent electric shock by quickly shutting off power in the event of a ground fault or short circuit. They are typically required for outlets near sinks, countertops, and areas prone to moisture.
How can I upgrade my circuit breaker to improve the safety and efficiency of my electrical system?
To upgrade your circuit breaker for improved safety and efficiency, consult a licensed electrician to assess your current system and recommend appropriate upgrades. This may involve installing a higher amperage breaker, adding ground fault circuit interrupters (GFCIs) or arc fault circuit interrupters (AFCIs), and ensuring proper wiring and insulation. Regular maintenance and inspections are also crucial to ensure the continued safety and efficiency of your electrical system.
What safety devices that stop the flow of electric currents?
There are two types. A fuse is a piece of wire that is thinner than the circuit it is placed in series with. Any excessive current causes the fuse to melt and this cuts off the power. The fusing current is somewhat unpredictable. A circuit-breaker is a resettable device that can be set to interrupt the supply at a fixed amount of current.
