1.What is the maximum allowable conduit or tubing fill when two or more conductors or cables are installed?
1.当安装两根或多根导线或电缆时，导管或管路的允许最大填充率是多少？
2.What material is used inside conduit to stop gas leakage?
2.导管内部使用什么材料来防止气体泄漏？
3.What type of circuit breaker fits into a single panel slot but supplies two individual circuits?
3.哪种类型的断路器仅占用配电箱的一个插槽，却能为两个独立的回路供电？
4.What fitting prevents flame or gas migration in hazardous conduit systems?
4.在危险场所的导管系统中，哪种配件用于防止火焰或气体的迁移？
5.What is the maximum gap permitted around an electrical box in drywall?
5.在石膏板墙面中，电气接线盒周围允许的最大间隙是多少？
6.Which of the following may serve as an approved grounding electrode?
6.以下哪项可作为经认可的接地电极？
7.How high should a fire alarm bell or horn be mounted above grade?
7.火灾报警铃或警报器应安装在高于地面（标高）多少的高度？
8.What conduit is required in Class I Division 1 hazardous areas?
8.在I类1区（Class I Division 1）危险场所中，要求使用哪种类型的导管？
9.What is the minimum burial depth for a cable or conductor installed beneath a 4-inch-thick concrete slab?
9.敷设在4英寸厚混凝土板下方的电缆或导线，其最小埋深应为多少？
10.How are solar collectors mounted on tile roofs?
10.太阳能集热器应如何安装在瓦屋顶上？
