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2.017 Lab Rules and SafetyRm. 5-007September 9, 2009 (Version 2)Dr. Harrison H. [email protected] RULESWORK SAFELY IN THE LABPOWER TOOL USE IS RESTRICTEDDO NOT WORK WITH CHEMICALS ALONECLEAN UP BEFORE YOU LEAVEDO NOT REMOVE ANYTHING FROM THE LABDO NOT GIVE ACCESS CODES TO ANYONEDRESS APPROPRIATELY FOR LAB WORKSafety in the Lab and in the FieldElectrical SafetyElectrical Safety RemindersDealing with Emergencies2.017 Lab Rules and SafetyRm. 5-007September 9, 2009 (Version 2)Dr. Harrison H. Chin9/9/2009 5-007 2LAB RULES1. WORK SAFELY IN THE LAB2. POWER TOOL USE IS RESTRICTED 3. DO NOT WORK WITH CHEMICALS ALONE4. CLEAN UP BEFORE YOU LEAVE5. DO NOT REMOVE ANYTHING FROM THE LAB WITHOUT PERMISSION6. DO NOT GIVE ACCESS CODES TO ANYONE 7. DRESS APPROPRIATELY FOR LAB WORK9/9/2009 5-007 3WORK SAFELY IN THE LAB• The lab is available to students only when a supervisor (instructor, TA or the lab manager) is present. • During scheduled class times, only class members may use the lab, unless granted permission by the class instructor. • Safe and careful use of hand tools, electronic equipment, and computers is unrestricted except as specified by the instructors for safety or other reasons. • Learn and follow safety guidelines for each tool and piece of equipment. • Be vigilant with electricity. Electrical fires can occur with high currents and high resistance. Anything above around 40 Volts is a shock hazard.• Use your engineering knowledge, experience and common sense to avoid dangerous situations and maintain a safe working environment.9/9/2009 5-007 4POWER TOOL USE IS RESTRICTED• In all circumstances, no person is to use power tools alone! • Power tools must be kept under lock and key. Regular access to power tools is during scheduled class times, and when instructors are present. • Students must be trained to use each power tool before using it.• Students may not use power tools without an instructor or another trained student present. • Students who violate these rules will lose privileges for using power tools.9/9/2009 5-007 5DO NOT WORK WITH CHEMICALS ALONE• In all circumstances, no person uses chemicals alone. • Chemicals (including solvents and adhesives) are to be used onlyunder the supervision of an instructor, or with the assistance of another student who has used the same chemicals under instructorsupervision.9/9/2009 5-007 6CLEAN UP BEFORE YOU LEAVE• Many classes, clubs, and students use the lab. Therefore, all benches and workspaces must be kept clean and clear for others to use.• Lab benches and workspaces must be cleared at the end of class, or when leaving for more than 1 hour. All common tools must be returned whenever you leave the lab, even for short periods of time.• Label items on bench with name, contact info and time of return, or they may not be there when you get back!• Project specific parts and equipment can be placed in storage locations designated for each class or student.9/9/2009 5-007 7DO NOT REMOVE ANYTHING FROM THE LAB• Tools, Equipment, Parts, Supplies, Books, Software and other labproperty are not to leave the lab except for the purpose of class-specific fieldwork, or with specific instructor permission. • Items removed from the lab must be logged with the student’s name, email, phone number, destination, and return time. • The only things you may freely take from the lab are your personal belongings, lab notebook, and disks containing experiment data.9/9/2009 5-007 8DO NOT GIVE ACCESS CODES TO ANYONE • Do not give the lab door code or access card to anyone. • Do not give the lab computer login passwords to anyone.9/9/2009 5-007 9DRESS APPROPRIATELY FOR LAB WORK • Eye protection must be worn for all tool, chemical and soldering work. • Closed-toed shoes must be worn in the lab. and whenever anyone is working with solder, chemicals, tools, power tools, or heavy items. • Loose clothing is to be avoided in the lab, and must be secured if worn. • Long hair must be secured when in the lab.9/9/2009 5-007 10Safety in the Lab and in the Field • Awake, alert and prepared – Do not try to remedy the emergency yourself– Notify your instructor and dial 100 to get help• It never hurts to be too careful in the lab– Bring your concerns and/or questions to the attention of your instructor before you carry-out the procedure. – If your lab partner or any other student is not acting in a safe, responsible fashion notify your instructor immediately. – NEVER WORK ALONE in the lab. Someone should always be nearby, ready to help in the event of an emergency. • Familiarize yourself with the layout of the lab– Note the location of the doors, the windows, the phone, the first-aid kit and the layout of the aisles and workbenches. – Note also the locations of the nearest fire alarms and security phones and the routes to the nearest exits from the building9/9/2009 5-007 11Electrical Safetyhttp://web.mit.edu/environment/ehs/electrical_mechanical.html• THE QUANTITY OF CURRENT FLOWING THROUGH THE BODY – Current (amperes) is the killing factor in electrical shock, not the voltage. The voltage only determines how much current will flow through a given body resistance. In general, the body's resistance to electrical shock is minimal (150,000 to 600,000 Ohms.) Even contact with standard 110-volt circuits can be lethal under certain conditions. Refer to the chart below. • THE CURRENT PATH THROUGH THE BODY FROM ENTRY TO EXIT – Hand-to-hand, hand- or head-to-foot, and ear-to-ear current paths are the most dangerous because they may cause severe damage to the heart, lungs and brain. This is why it is important not to wear metal jewelry, not to lean against or use both hands on electrical equipment so as not to become part of the circuit. • THE LENGTH OF TIME THE BODY IS IN THE CIRCUIT – The longer the body is in the circuit, the greater the damage. You may be unable to let go of a 15 to 20 milliampere current. The body temperature may increase possibly damaging tissues, bones, and organs. • EFFECTS OF 60 HZ CURRENT PASSING THROUGH THE BODY (CURRENT IN MILLIAMPS)– 1 or less 5 May not be felt - Maximum harmless intensity– 1 to 8 Sensation of mild shock, can let go at will – 8 to 15 Painful shock, muscles contract, may still be able to let go – 15 to 20 Painful shock, can NOT let go – 20 to 75 Intense pain, breathing may be paralyzed 100 to 200Ventricular fibrillation; holds


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MIT 2 017J - Lab Rules and Safety

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