What must be consulted to determine the maximum number of conductors allowed in a single conduit?

To determine the maximum number of conductors allowed in a single conduit, consulting the NEC fill tables is essential. The National Electrical Code (NEC) provides specific guidelines and tables that detail the permissible number of conductors you can place in various sizes of conduits while considering factors like conductor size, insulation type, and conduit type.

These fill tables are designed to ensure that conductors can be properly installed without overheating or suffering from voltage drop due to excessive crowding. The tables take into account the cross-sectional area of the conductors and the conduit, allowing for safe and compliant installations.

While the other options may relate to different aspects of electrical work, they do not specifically address the maximum number of conductors in a conduit. Circuit capacity charts focus more on the electrical load that conductors can carry, the safety standards manual covers general safety practices, and local electrical codes may have their own provisions but still rely on the standardized NEC tables for conduit fill calculations.