What type of receptacles must be used for showcases?

The use of grounding type receptacles for showcases is critical for safety and functionality. Grounding type receptacles are designed to protect users from electrical shock by providing a safe path for fault current to the ground. This is especially important in areas like showcases, where electrical devices (such as lights or point-of-sale equipment) may be used and could pose a risk if a fault were to occur.

Showcases often contain displays that may involve various electrical devices, and the grounding feature ensures that any fault current is safely diverted, minimizing the risk of electrical shock. Additionally, grounding helps to stabilize voltage levels and reduce the potential for electrical interference, which is beneficial for electronic devices and displays.

In contrast, non-grounding type receptacles lack this essential safety feature, making them inappropriate for use in situations where extra protection is needed, such as in showcases. Heavy-duty type receptacles are designed for high-load applications and are not specifically necessary for showcases. Standard type receptacles may not provide the grounding necessary for safety in this context. Therefore, the grounding type receptacle is the correct choice, ensuring compliance with safety standards and promoting safe usage in environments where electrical devices are in operation.