Safety Class

This class is a prerequisite for Building or any hardware work.

Hazards to You

Here are some things to be careful of.

Electric shock

Unplug the power cord, or at the very least turn off the power switch on the back of the PSU before working inside a case.

Many computer parts feature capacitors as a component. Capacitors can hold a charge for a long time, even when the device has been unplugged for months or years. Smaller capacitors as found on mainboards or expansion cards are unlikely to hurt you. Never disassemble a power supply unit or CRT monitor as the capacitors inside can carry a dangerous level of charge.

Cuts

There are hundreds of things in a computer case you can cut yourself on. Flexible nitrile work gloves are strongly recommended.

Respiratory hazard

Many, or even most, of the systems we open up will be full of dust. Be prepared for the occasional moldy spilled drink, mouse carcass, or discarded clothing ( koanhead has found each of these inside computers at least once.) The process of cleaning these old machines is bound to release all this nastiness. A dust mask and eye protection are recommended for these situations.

Little flying bits

Working on computers takes a gentle touch so this won't happen often. There are very few things inside a computer case that need to be forced. Don't be in a hurry. Occasionally parts will go flying and some eye protection is not a bad idea.

People

People make mistakes. Put a bunch of people in a small space with a lot going on, and they make more mistakes. Luckily, it works the opposite way as well. Keep an eye out for your neighbors, help when they need help, interrupt if they are about to do something hazardous, and above all be kind. We're all learning.

Hazards to machinery

Here are some bad things you can do to the machinery if you aren't careful. Frankly we don't care that much if you destroy a machine in Build, as long as you don't injure yourself or others. But the more machines survive Build, the more quickly grantees and volunteers get their computers.

Electrostatic discharge

Your body tends to build up a static charge. If you don't take care to short your charge to ground, then you can discharge into certain sensitive equipment. CPUs, RAM and HDDs are all particularly vulnerable. Keep these components in anti-static bags until time for use. Use your grounding strap, and learn how to ground yourself. Make a habit of periodically grounding out.

Skin oils

No matter how clean you are, your skin exudes oils that can damage certain sensitive components. The pins on a CPU and the edge connectors on RAM and expansion cards are examples. Take care in handling these things, hold them by their edges and don't touch the conductive parts.

Moisture

Don't get components wet. If they get wet, allow them to dry thoroughly before passing electricity through them.

Remember, the magic smoke makes the gubbins work. Don't let it escape!

Protection

Where's the stuff?

Safety equipment lives on the shelf on the east wall, in the southeast corner. There are gloves, eye protection and dust masks available (or were the last time I looked.) Please consider bringing your own gloves, you'll be able to get better ones than we can provide. Ditto for eye protection.

Right now we have only one grounding strap and no tacky pads. We're working on it.

Demonstration of best practices

I recommend that Safety Class instructors use a broken computer to demonstrate best practices with safety equipment and procedures. Point out:

• sharp edges
• catch points
• vulnerable areas
• good grounding areas; how to ground a case
• what parts to avoid touching
• how to hold sensitive parts