Yes, the National Electrical Code (NEC) now requires grounded conductors (neutral wires) in switch boxes. This change was introduced in the 2014 edition of the NEC and is intended to improve safety and to make it easier to identify and connect the neutral wire.Previously, the NEC did not require grounded conductors in switch boxes, which meant that electricians had to run a separate wire from the panel to the switch box to provide a neutral connection. This could be time-consuming and could lead to errors in wiring.The new requirement for grounded conductors in switch boxes eliminates the need for a separate neutral wire, making it easier and faster to wire switches. It also helps to ensure that the neutral wire is properly connected, which can help to prevent electrical fires and other hazards.Here is the specific code section that addresses this requirement

NEC 404.2(B)

Grounded Conductors. Grounded conductors shall be installed in switch boxes for switches controlling lighting loads.This requirement applies to all new electrical installations, as well as to any renovations or alterations that involve the replacement of switches. Flag for review