What is the size indicated for the feeder conduits on Panelboard Schedule MSB2?

The indicated size for the feeder conduits on Panelboard Schedule MSB2 being seven 4" conduits is based on the panel's electrical load requirements and conduit fill capacity. In electrical design, the size of conduits is critical to ensure that they can adequately house the feeders while also complying with safety and code requirements, such as those stated in the National Electrical Code (NEC).

Selecting seven 4" conduits suggests a robust system capable of supporting multiple feeders or large conductors that may be required due to the electrical load connected to this panel. This choice would allow for adequate space for installation, maintenance, and thermal dissipation, which is important for preventing overheating of the conductors.

In contrast, the other options may not meet the necessary electrical and safety requirements for this particular application. For instance, four 3" conduits would provide a smaller cross-sectional area compared to the seven 4" conduits, potentially making them insufficient for the load. Similarly, five 2" conduits could also be inadequate, as 2" conduits have even less capacity. Two 6" conduits, while larger, may not be the most efficient or practical choice for the specific layout and design of the panelboard system in question