Red Seal Construction Electrician Practice Exam

Direct Burial Cable (DBC) is specifically designed for underground installation, making it the appropriate choice for underground wiring. This type of cable features robust insulation and sheathing that can withstand moisture, soil acidity, and other environmental factors typically found underground. The construction of DBC ensures that it provides a reliable and safe means of delivering electrical power without the need for additional conduit protection, which is often required for other types of wiring.

Regular insulated cable, while it can be used in some installations, does not have the necessary protection to be buried directly in the ground without additional conduit. Coaxial cable is intended for signals and communications, not for power delivery in an underground environment. Flexible extension cords are designed for temporary use and are not rated for permanent underground installations, making them unsuitable as well.

Therefore, the use of Direct Burial Cable ensures both safety and compliance with electrical codes when running wiring underground.