Oklahoma Electrical Practice Exam

What is a mandatory feature for a thermostatically controlled switching device serving as a disconnect for fixed electric space heating equipment?

1. It must have a bright color indicator

2. It must have a marked "off" position

3. It must be installed at a height of at least 5 feet

4. It must have an emergency shutoff option

The correct answer is: It must have a marked "off" position

A thermostatically controlled switching device that serves as a disconnect for fixed electric space heating equipment is required to have a marked "off" position. This feature is crucial for safety and functionality. It allows users to easily identify when the device is in the off state, promoting safe operation and maintenance. Clearly marking the "off" position helps to prevent accidental reactivation of the heating equipment when it needs to be serviced or when it is not in use. This is particularly important in situations where the heating system could potentially pose a hazard if turned on inadvertently. The regulation emphasizes the importance of user-friendly designs in electrical devices, ensuring that anyone interacting with the system can quickly and safely turn it off. While factors such as color indicators, installation height, and emergency shutoff options are significant considerations for various electrical devices, the marking of the "off" position is specifically mandated to ensure clarity and safety in the operation of heating equipment.