Not so far off topic as it might seem:
The reason for not plugging in more than 3 strings in a daisy chain is that the
cheap plugs are not up to the task of carrying current for more than three
strings.
Connecting more than that will create a firs hazard but will NOT cause the bulb
burnout problem in question.
This is relevant to radio discussions for a good reason. We all operate radios
with fairly high current demands. Operation of one at a time may cause no
issues, but sometimes people also daisy chain power plugs in the shack. While
the circuit providing power to a given outlet may be fused at 15 amps, the
actual outlet itself, if not on perfect condition, may not be capable of
carrying 15 amps, especially if everything is daisy chained to only one of the
two outlet sockets. Thus the outlet can overheat even though there is not
enough total current flowing in the circuit to pop the breaker back at the
power panel. That is why all safety announcements and warnings specifically
tell you to not use multiple power splitting cubes and so on.
Gary
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