The NEMA chart is divided into which two general classifications?

The NEMA (National Electrical Manufacturers Association) chart provides a system for categorizing electrical connectors, primarily focusing on their design and intended application. The classification into straight blade and twist lock reflects the physical characteristics and operational functionality of the connectors.

Straight blade connectors are the most commonly found plugs and receptacles that provide a straightforward insertion without requiring any rotational force to secure the connection. They are typically used in many general applications where the equipment does not require the locking mechanism that twist locks provide.

On the other hand, twist lock connectors feature a mechanism that allows the user to secure the connection by twisting the plug into the receptacle, ensuring that the connection remains secure even under stress or movement. This type is often favored in industrial settings where the likelihood of disconnections due to movement or vibration is higher.

Understanding these classifications is crucial for selecting the appropriate connector for a specific application to ensure safety and functionality in electrical installations.