Look for an open neutral (white wire) on the return leg to the electrical panel.
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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.
The receptacles will be wired in parallel with each other.
Receptacles are not wired in series. Receptacles are actually wired in parallel, what this means is that all phase wires (black) in a receptacle's box should terminate to the brass screws on each device, and all neutral (white) wires in the box should terminate on the silver screws on each device.
Improperly wired receptacle is the normal cause.
NO! You are drastically in excess of electrical code requirement. A 15 amp circuit should not exceed eight total receptacles and/or lighting devices.
This action was done in the past but not so much now. It was a case of the manufacturer installing a grounding pin in their cords while homes were still using two blade receptacles. Prior to new homes having to install a grounding receptacle, homes were wired with only two slot receptacles. These two slot receptacles just had a "hot" and neutral connection for 120 volt output supply and no accommodation for the grounding of the receptacle. The new three pin extension cords would not fit into the two blade receptacles because of the grounding pin so the home owner cut off or pulled the pin out of the plug in end of the cord. Now everything is back to normal with conversions being made from two blade to three blade receptacles. In new home installations for the past fifty years it has been mandatory to use the three blade grounding receptacles.
code states that if a water source such as a sink is within 6 feet of a receptacle, that recetacle (s), must be protected by a GFCI receptacle. I believe the actual distance is 5 feet. Please forgive me if I'm wrong. But the NEC also requires that ANY counter top receptacles in a kitchen and receptacles ANYWHERE in a bathroom must be GFCI protected. More directly to your question, ordinary receptacles can be protected from a GFCI receptacle if properly wired. They are designed to do that. It is a way to save money. You may also consider a GFCI breaker if you have many receptacles to protect. I was told once that there is a limit of 3 "piggy backed" receptacles per GFCI but I have never seen that in the NEC.
Wall receptacles are wired in parallel. black to black, white to white, ground to ground.
Possibility #1 Plugging in a high consumption appliance. Possibility #2 Loose connection. Look for glazing, or discoloration on the prongs of the device. Old receptacles can lose tension in the female spring loaded contacts. Check to see if the receptacle is Back wired through a hole in the back, or if the wires are terminated on the side screws. Back wired receptacles use the same spring-loaded contacts on the wire connection. Any loose connection can cause excessive resistance resulting in higher amperage and heat.
In most instances, YES especially if it is a BUILT-IN microwave Most microwaves are 1500-1800 watts; this is the entire capacity of one branch circuit If it is plugged into a receptacle that shares a circuit with other receptacles, then the other shared receptacles can not be used while using the microwave. In busy kitchens (commercial) and sometimes at home, this would prove inconvenient
Most receptacles are wired in parallel to separate circuits in household wiring. trace the circuit back until you find a 'live' plug. From that point to the next outlet, there could be a loose, bad or unhooked wire. before you go removing receptacles, be sure to pull the breaker (shut the breaker off). All wire connections should be tight.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-energizedIF YOU ARE NOT REALLY SURE YOU CAN DO THIS JOBSAFELY AND COMPETENTLYREFER THIS WORK TO QUALIFIED PROFESSIONALS.
A series circuit will be wired from the power source at the positive input of the first device, the second device will receive power from the output of the first device and then go back to ground. A parallel circuit is wired so that both devices receive power from the power source directly to the positive input and both are wired directly to ground.
They are wired in parallel, series and series - parallel.