What is arc flash - Study guides, Class notes & Summaries

What is an Arc Flash? - ANSWER A short circuit that jumps through the air from one exposed conductor to another. What makes an Ar Flash dangerous? - ANSWER Temperatures of up to 35k' F, shrapnel, molten metal, chocks, shockwave (2k lbs/foot^2), soud (140 dB), burn injuries. Hazard/Risk Category 1 contains PPE requirements. What are they? - ANSWER hardhat, safety glasses, hearing protection, heavy duty leather gloves, leather work shoes. What proper electrical PPE protect you from? - AN...

CWB Level 2 Welding Inspection Exam Questions With 100% Correct Answers Latest Update 2024 (Graded A+) Creating a safe working environment is strictly the responsibility of the employer? - Correct Answer-False, it the the joint responsibility of the employer and employee. WHMIS stands for: a) Workers Health Monitoring System b) Workplace Hazardous Materials Information System c) Workers for a Healthy Manufacturing Industry Society - Correct Answer-b) Workplace Hazardous Materials Informat...

NETA 2 Top Exam Questions and answers, rated A+ Under what considerations can tag out without lock out be permitted? - -***&If an energy isolating device is not capable of being locked For PV systems, a(n) _____ is a device that changes direct-current input to an alternating-current output. - -Inverter Identify the contact pictured above. (NC and NO separated by a node) - -Form C When applying personal protective grounds, which end is attached first? - -***&The equipment end An ...

IAAI CFI & NFPA 921 Final Exam Questions and Answers Latest Updated 2024/2025 | Graded A+. Rule of Nines" Medical concept, where major body areas are represented by increments of 9% *For example the head equals 9% 109F In hyperthermia, what core body temperature is generally fatal within minutes unless treated? 4.0 to 10 w.c. The typical water column range for gas service lines 4th Amendment The amendment concerning search and seizure *Remember "knocking" 5th Amendment The amendment ...

IAAI CFI Exam Questions With Verified Answers Latest Update 2024/2025 | Scored A+. A liquid with a flash point ABOVE 100F - correct answers Combustible Liquid If the current flowing out from an electrical panel is 12.5 amps, and it then flows through an electrical load of 1500 watts, what is the amperage of the remaining current flow of the return circuit? - correct answers 12.5 If a hair dryer draws 8.3amps (in a home with 120-volt service), what is the wattage? *Power (P) = current (I) ...

The best way to avoid problems with fumes, ozone, and smoke from welding processes is to - Answer-provide adeqete ventilation the danger involved in welding a sealed container is due to gas - Answer-expansion the proper type of fire extinguisher to use on an electrical fire is - Answer-type c osha defines a confined space as a space that - Answer-has limited or restricted means of entry or exit An MSDS provides information - Answer-regarding possible hazards resulting from the use of...

NFPA 70E Questions and Answers Already Passed 2. For exposed 480 VAC energized conductors and using NFPA 70E Table 130.2(C) or the Shock Protection Boundaries and PPE Fermilab Summary table for NFPA 70E, the Restricted Approach Boundary for shock protection is a. 1 Inch b. 7 Inches c. 1 Foot d. 3 Feet 6 Inches c 3. For energized circuits, escorted unqualified persons are allowed within which Shock Protection Approach Boundaries? a. Restricted Approach Boundary b. Limite...

True or False: A mandatory rule can have exceptions. - Answer-False True or False: Permissive rules are allowed but not required to be performed - Answer-true What does NEC stand for? - Answer-National Electrical Code What do chapters 1-4 of the NEC cover - Answer-General electric installations What do chapters 5-7 of the NEC cover - Answer-Special equipment and loctations What does chapter 8 of the NEC cover - Answer-Communication systems What does chapter 9 of the NEC cover -...

NFPA 70E QUESTIONS AND ANSWERS RATED A+ Accessible (as applied to equipment) Admitting close approach; not guarded by locked doors, elevation, or other effective means. Accessible (as applied to wiring methods) Capable of being removed or exposed without damaging the building structure or finish or not permanently closed in by the structure or finish of the building. Accessible, Readily (Readily Accessible) Capable of being reached quickly for operation, renewal, or inspections w...

What is an Arc Flash? - ANSWER A short circuit that jumps through the air from one exposed conductor to another. What makes an Ar Flash dangerous? - ANSWER Temperatures of up to 35k' F, shrapnel, molten metal, chocks, shockwave (2k lbs/foot^2), soud (140 dB), burn injuries. Hazard/Risk Category 1 contains PPE requirements. What are they? - ANSWER hardhat, safety glasses, hearing protection, heavy duty leather gloves, leather work shoes. What proper electrical PPE protect you from? - AN...