Which of the following must be included when updating wiring for a new oil burner installation?

When updating wiring for a new oil burner installation, including properly installed emergency switches is essential for ensuring safety and compliance with the regulations. Emergency switches allow for immediate disconnection of power to the oil burner in case of a malfunction or emergency situation, which is critical in preventing accidents or hazards associated with the operation of oil burners.

Safety codes often require that such emergency shut-off switches be installed in accessible locations to allow for quick access in emergencies. This not only helps in protecting individuals working around the equipment but also protects the property from potential hazards like fires or leaks that could result from equipment failures.

The other choices do not fulfill the safety and compliance requirements necessary for proper installation and operation of oil burners. Therefore, ensuring the presence of properly installed emergency switches is integral to safe oil burner operations and regulatory adherence.