Why should a circular saw that does NOT have an upper blade guard NEVER be used? The trigger lock will not work properly. ) The safety features will be disabled. The exposed blade poses a danger.

## Step 1<br />A circular saw is a power tool that is used for cutting various materials. It is designed with safety features to protect the user from the sharp blade. One of these safety features is the upper blade guard.<br /><br />## Step 2<br />The upper blade guard is a protective cover that shields the sharp blade when the saw is not in use. This prevents accidental contact with the blade, which could lead to serious injuries.<br /><br />## Step 3<br />If a circular saw does not have an upper blade guard, the sharp blade is exposed. This poses a significant danger to the user and anyone in the vicinity.<br /><br />## Step 4<br />The trigger lock and the safety features are not directly related to the presence or absence of the upper blade guard. The trigger lock is a mechanism that allows the saw to continue running even after the trigger is released. The safety features are mechanisms that prevent the saw from operating in a dangerous manner.<br /><br />## Step 5<br />Therefore, the primary reason a circular saw without an upper blade guard should never be used is that the exposed blade poses a danger.