请注意:此版本的所有临时修订版将在您购买时提供。软线卷SUL 3551示波器1。1这些要求包括一般用途的线盘，以及拟安装在电器、便携式灯具或类似设备上或其中的线盘（本文称为特殊用途线盘）。这些电线盘是根据国家电气规范NFPA 70.1.2使用的。这些要求还包括工厂、家庭车间、车库、商业设施和建筑工地使用的电线盘，这些地方可能需要额外的保护，防止水、灰尘或其他污染物进入。 1.3这些要求还包括上述使用的电线盘，但不包括在《国家电气规范》NFPA 70.1.4中规定的商业车库中的危险位置。这些要求涵盖的电线盘是配备或打算与一定长度的软线一起使用的电线盘。卷筒为用户提供了一种根据需要解开绳索的方法。卷筒配有一个卷绕机构，通过该机构，绳索可以在卷筒上重新卷绕。绳索伸展或收缩至所需长度的机构可能由电机驱动，也可能不由电机驱动。 在某些情况下，提供了一个闩锁，以在绳卷使用时限制弹簧张紧机构的动作。1.5应允许电线盘在负载连接处使用接地故障断路器（GFCI）插座。接地故障断路器应根据2010年2月26日生效的《接地故障断路器标准》（UL 943.1.5）中的适用要求进行调查

Please note: All interim revisions for this edition available at time of your purchase will be included.Cord ReelsUL 3551 Scope1.1 These requirements cover cord reels for general use, as well as cord reels - herein referred to as special-use cord reels - intended to be mounted on or in electrical utilization equipment such as appliances, portable lamps, or similar equipment. These cord reels are intended for use in accordance with the National Electrical Code, NFPA 70.1.2 These requirements also cover reels for use in factories, household workshops, garages, commercial facilities and construction sites where an additional degree of protection against the risk of the entrance of water, dust or other contaminates might be needed.1.3 These requirements also cover cord reels for use above but not in hazardous locations in commercial garages as defined in the National Electrical Code, NFPA 70.1.4 A cord reel, as covered by these requirements, is a reel equipped with, or intended for use with, a length of flexible cord. The reel provides a means for the cord to be unwound by the user as desired. The reel is provided with a take-up mechanism, by which the cord is rewound on the reel. The mechanism by which the cord is extended or retracted to the desired length might or might not be driven by a motor. A latch is provided in some cases to restrain the action of a spring take-up mechanism while the cord reel is in use.1.5 A cord reel shall be permitted to employ Ground-Fault Circuit-Interrupter(s) (GFCI) outlet(s) at the load connection. The Ground-Fault Circuit Interrupters shall be investigated under the applicable requirements in the Standard for Ground-Fault Circuit Interrupters, UL 943.1.5 added effective February 26, 2010