An important safety precaution to use when working with PVC conduit is to_____________.

Providing proper ventilation to carry off fumes from the joint cement is crucial when working with PVC conduit because many joint cements and adhesives emit harmful volatile organic compounds (VOCs) during application and drying. Inadequate ventilation can lead to the accumulation of these fumes, potentially resulting in respiratory issues or other health hazards. Ensuring good airflow helps dissipate these fumes, minimizing exposure and maintaining a safe working environment.

Other options, while they may relate to the handling and size of PVC conduit, do not directly address safety concerns related to fumes and chemical exposure. It's essential to prioritize measures that protect health while working with materials like PVC and their associated adhesives.