precautions while using power supply

Precautions while using Power Supply

Precautions for Safe Use for that Product Do not touch the Product while power is being supplie.
31. Pre servicing procedure
Turn off the server and all the peripherals connected to it.
Unplug all cables from the power outlets to avoid exposure to high energy levels that may cause burns when parts are short circuited by metal objects such as tools or jewelry.
During disassembly, label each cable as you remove it, noting its position and routing.
This will make the replacement of the cables much easier, and will ensure that the cables are rerouted properly to protect the cables.
Keep all screws with the units removed. The screws used in the server may be of different thread sizes and lengths; using the wrong screw in a component could damage the unit.
If server is installed in a rack, remove server and place it on a flat surface.
Disconnect telecommunication cables to avoid exposure to shock hazard from ringing voltages.
Follow the ESD precautions when handling a server component.
32. Post installation instructions
Observe the following items after removing/replacing a server component
Be sure all components are installed according to the described step by step instructions.
Check to make sure you have not left loose tools or parts inside the server.
Reinstall the PCI riser, peripherals, and system cables that you have removed.
Reinstall the server into the chassis.
Connect all external cables to the system.
Press the power button on the front panel to turn on the server.
33. Server warnings and cautions
Before installing a server, be sure that you understand the following warnings and cautions.
34. Always Turn the Power OFF
Any time youre working on an electrical circuit in your home, turn the power off at the circuit breaker to ensure no voltage is flowing through the wires. If for some reason you cannot turn off power to the circuit, you may want to have a licensed electrician do the job if you are nervous about working on live electricity.
35. Ensure Your Tools are Functional
When it comes to working on your homes electricity, a multi tester is going to be your best friend and your go to tool for ensuring safe working conditions. But, before you place your trust in this instrument, you need to make sure it is working properly. Do this by using it to test a circuit that you already know is working, like a receptacle in another room. Since digital multi testers use batteries, performing this test will let you know that the battery is good and the tester is working.
You should also only use insulated screwdrivers when working on electrical circuits. These screwdrivers have insulated handles and shafts that help prevent accidental shorts.
36. Wear the Right Clothing and Gear
Any time youre working on your homes electricity you should be wearing safety glasses if you dont already wear traditional glasses. Debris from drywall or sparks from an accidental short can easily get in your eye if you arent protected. As an extension of this, you should also wear ear protection when youre using power equipment like a reciprocating saw or a power drill.
The clothing you wear can also impact the safety conditions of your work site. For example, wearing rubber soled boots and electricians gloves will help protect you from accidentally grounding yourself, which could result in your death if the shock is strong enough. As an added layer of protection, you should always keep a cell phone or a cordless phone near you when you are working on the electricity so you can call for help should you need it.
37. Notifications are Important
When youre working on your homes electricity, tell everyone in the residence that there may be power outages and to not to worry. You should also place a piece of electrical tape over any breaker s you turn off and tape a note to the electrical panel door as another notice that you are working on the electric. This will help prevent anyone from accidentally turning the circuit on while you are working on it.
38. Never Touch the Service Wires
Inside the electrical panel, there are two types of wires the thick service wires coming in the top or bottom of the panel and the individual circuit wires that get connected to the breakers, neutral bar and grounding bar. Even when you turn the panels main breaker, the service cables remain hot, so you should never work on these cables.
39. Dangerous voltage
Its actually the current that is important rather than the voltage, but due to the resistance of the body you cant get a dangerous current without there being sufficiently high voltage. You can work this out yourself using ohms law, but the important thing as far as this is concerned is to remember the safety principles. Generally you are relatively safe dealing with voltages of less than 50V, but anything above that can be dangerous.You are generally safe from electrocution on most electronic circuits that run off domestic batteries, including 12v car batteries. There may however be batteries in your home that can pose a real danger, such as the output from a UPS uninterruptible power supply for a computer, or if you have a home energy system such as solar panels.Even if you equipment is designed to run at less than the dangerous voltage for electrocution it may still pose a risk of burns, fire or even explosion so keep reading.
40. AC vs DC
You may have heard some people say that AC is more dangerous than DC power, or vice versa. Rather than get into too much debate over one vs. the other both AC and DC at high voltages can be lethal. AC is considered to be more likely to cause cardiac arrest by interrupting with the electrical signals controlling the heart, but DC can cause burns and both can still kill so debating the differences is pretty academic. Just remember electricity can kill if it has sufficient voltage and current whether its AC or DC.