What is the formula for proof load testing a forklift truck overhead guard?

Proof load tests for forklift truck overhead guards are typically conducted in accordance with the American Society of Mechanical Engineers (ASME) B56.1 safety standard. The formula for calculating the proof load is:

```

P = 1.5 x W x L

```

Where:

* P = Proof load in pounds (lbs)

* W = Weight of the overhead guard in pounds (lbs)

* L = Length of the fork support in inches (in)

For example, if an overhead guard weighs 200 lbs and has a fork support length of 48 inches, the proof load would be:

```

P = 1.5 x 200 lbs x 48 in = 14,400 lbs

```

The overhead guard must withstand the proof load without permanent deformation or damage.