The vibration from the floor when turning on certain lights or starting up the dishwasher could be caused by a phenomenon called "electromagnetic interference" (EMI). EMI occurs when electromagnetic fields generated by electrical devices interact with each other, causing unintended consequences like vibrations or noises.
Here's how this could happen in the scenarios you mentioned:
Lights: Some types of lights, such as fluorescent bulbs or LED lights, operate by rapidly switching electrical currents on and off. This switching action can create electromagnetic fields that may interact with other nearby electrical components or wiring. If the electrical wiring in the walls or the lighting fixture itself is not properly shielded or isolated, it can pick up these electromagnetic fields and cause vibrations in nearby objects like the floor.
Dishwasher: Dishwashers contain motors, pumps, and other electrical components that can generate electromagnetic fields as they start up and operate. These fields can interact with other nearby metal objects, such as the dishwasher's frame, the surrounding cabinets, or even the electrical wiring in the walls. As a result, vibrations may be transmitted through the structure and felt on the floor.
To reduce or eliminate these vibrations, consider the following steps:
Check Electrical Wiring: Ensure that all electrical wiring in the house is properly installed and shielded to minimize the risk of electromagnetic interference.
Quality Appliances: Purchase appliances from reputable brands known for producing quality products that comply with electromagnetic compatibility (EMC) standards. These appliances are designed to minimize EMI.
Use Ferrite Beads: If the problem persists, you can try attaching ferrite beads to the power cords of the lights or appliances. Ferrite beads can help suppress electromagnetic interference.
Isolate Components: Consider placing rubber pads or other vibration-damping materials under the feet of the dishwasher or lights to reduce vibrations transmitted to the floor.
Consult an Electrician: If the issue is severe or persistent, consult a qualified electrician who can inspect the electrical system and provide further advice or solutions.
It's essential to address any potential electromagnetic interference issues to ensure the proper functioning of electrical devices and to prevent potential damage to appliances or electrical systems.