What Is an Insulated Tool?
Insulated tools are sets of tools for use on energized parts.
They are characterized by the fact that the tools are covered with an insulating material, which insulates all parts except those that come in contact with mating parts, such as screwdrivers and ratchets. A special resin that does not conduct electricity is used as the insulator to protect the operator from electric shock.
The surface of the tool features a red coating that is easily noticeable and has a double coating structure. The manufacturer’s instructions state that use should be prohibited if the red part peels off.
Uses of Insulated Tools
Insulated tools are used when servicing parts that are energized, such as hybrid vehicles, fuel cells, and electric vehicles that carry high-voltage electricity.
In addition, insulated tools may only be serviced by qualified electricians. The IEC 60900 standard for insulated tools requires the use of insulated gloves for double safety when using insulated tools.
How to Select Insulated Tools
Insulated tools must be chosen in accordance with IEC60900, an international standard for the electrical and electronic fields. It is not necessarily applicable to all equipment as long as it is insulated, since breakdown occurs when a voltage above a certain level is applied, even to insulated materials, and electricity flows through them.
The standard stipulates that no breakdown or ignition will occur even when energized at 5000 V for 3 minutes, and there is an upper limit to the voltage that can be supported.
It is necessary to check whether the withstand voltage listed in the specifications section of the instruction manual or catalog is higher than the voltage flowing through the equipment to be used. If cracks are found at insulated points, dielectric breakdown will occur at lower voltages, so if damage to the insulator is observed, refrain from using the product.
In addition to energization, the standard also includes provisions for non-flammability and impact during freezing. Conformance to the standard proves that the tool has a certain degree of resistance to combustion and strength.
In addition to the performance of the tool itself, the standard prohibits the use of insulated tools from different manufacturers or tools that are not insulated, so it is important to choose the right one.