Electric ignition can be caused by which of the following means?

Electric ignition can occur through several means, and one of the primary methods is through conduction heating, which involves heat transfer through materials that conduct electricity. Additionally, sparks and arcs generated from electrical equipment or connections can also ignite flammable materials. Insulation degradation is another critical factor; as insulation wears down, it can lead to exposed wires that may create sparks, increasing the risk of ignition.

Conduction heating is especially important as it directly relates to how heat can build up in electrical systems, potentially leading to ignition if combined with flammable surroundings. Sparks and arcs are common in scenarios where electrical faults occur, creating high temperatures that can ignite nearby combustibles. Insulation degradation is a significant concern in older electrical systems, where wires may become exposed to the environment and conductive materials, creating a pathway for both electrical current and temperature rise.

In contrast, static electricity is usually a minor factor and less likely to cause electric ignition on its own compared to the mentioned methods. Direct contact with water generally pertains more to the risk of electrical shock or further complications in electrical systems, reducing the likelihood of ignition in typical scenarios. Circuit overload can create heat and lead to failure, but it is not as direct an ignition source compared to the previously mentioned methods.