Umm, yes they do, and no they do not need to mandate fuses in fixtures. Only place that I know that uses a fuse in the plug of fixtures is in England, and that is due to how their electrical system is designed.They really need to mandate integrated fuse protection into power cords and light fixtures. In some instances, circuit breakers, GFCIs, and AFCIs just don't cut it.
Those safety limits of 60w, are based on heat generatedWhy does it say "MAX. 660W" if it's only supposed to comply with the wattage limitations of the light fixture, usually 60W?
Not too drift the topic too much, but here's why that happens:The problem was that they were all burnt out at exactly the same time. There was two of them that suffered that fate.
This is very true !Not too drift the topic too much, but here's why that happens:
When one bulb in a christmas light string burns out, a shunt in the bulb closes, so current can still flow and the rest of the bulbs remain lit. When this happens, the current through the whole string increases slightly. When more than one or two bulbs are shunted, current through the string rises to the point that the rest of the bulbs can't handle it, and they all burn out nearly instantaneously.