Advanced Wiring第 56 / 110 题
A location where ignitable concentrations of flammable gases or vapors exist under normal operating conditions is classified as:
a.Class II, Division 1
b.Class III
c.Class I, Division 2
d.Class I, Division 1
解析
Class I covers flammable gases/vapors; Division 1 means ignitable concentrations can exist under normal operation, so it is Class I, Division 1.
法律依据: 2023 NEC 500.5(B)(1)免费刷完整 110 道题库 — 无需注册。
同考点相关题目
- A location made hazardous by combustible dust is classified as which class?
- In a Class I, Division 1 location, a sealing fitting must be installed within what distance of an enclosure containing arcing devices?
- What is the minimum number of receptacles required at a general care (Category 2) patient bed location?
- What is the minimum number of receptacles required at a critical care (Category 1) patient bed location?
- The equipotential bonding grid around a permanently installed pool must use a solid copper conductor no smaller than:
- A required convenience receptacle for a dwelling pool must be located not less than what distance from the inside pool wall?