NFPA70 Study Guide 2024 with Complete Solutions!

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? - ANSWER-burns, electrical shock and small shrapnel. What is PPE? - ANSWER-Personal Protective Equipment If you are qualified to work on low-voltage equipment, what is the cut-off point where you are not allowed to perform electrical tasks at higher voltages? - ANSWER-50 - 600V What is the most important part of creating an electrically safe work condition - ANSWER-Test for Voltage Once an electrically safe work condition is created, shock and arc flash protection are no longer necessary. (T/F) - ANSWER-True The Arc Flash Protection Boundary is the distance from an arc source where an unprotected worker will receive first-degree burns. (T/F). - ANSWER-False When dressing in layers for arc flash protection, non-FR material can be counted toward your total level of protection. (T/F). - ANSWER-False When dressing in layers for arc flash protection, non-FR material can be counted toward your total level of protection. (T/F). - ANSWER-False Crossing the _________ ___________ ___________ is the equivalent of performing live work. - ANSWER-Prohibited Approach Boundary For ener