What is an acceptable wiring method for service-entrance conductors carrying a maximum of 1000 volts?

For service-entrance conductors carrying a maximum of 1000 volts, the acceptable wiring methods include both underground conduit and armored cable, among potentially others. In accordance with the NEC (National Electrical Code) and local Ohio regulations, there are various approved methods for installing service-entrance conductors depending on the environment, installation conditions, and specific design requirements.

Using underground conduit is a common and widely accepted approach, particularly for installations that require protection against physical damage and where the conductors need to be routed underground. This method provides a secure pathway for the conductors and can protect them from environmental factors.

Armored cable, also known as AC or BX cable, is another acceptable option for service-entrance applications. It is constructed with a metal sheath that offers significant protection to the conductors inside, making it suitable for specific installations where additional durability is needed.

Since both of these methods are compliant with the NEC for service-entrance applications, the correct answer recognizes the validity of multiple wiring methods. This flexibility allows contractors to choose the most applicable and efficient method for their particular project and aligns with the NEC’s objectives of safety, reliability, and adaptability in electrical installations.