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EnglishMany people wonder if it's a good idea to connect two surge protectors for extra protection or access to more electrical outlets. The simple answer is no, and for good reason.
Plugging in another surge protector is in series, which means current flows from one surge protector to the other. The only extra protection that plugging one surge protector into the other can provide is redundancy. That is, if the first surge protector fails, the second will still function.
You don't gain the ability to absorb more energy during a surge. Different surge protectors can trip at different voltage levels, so the one with the lowest trip point should trip first and absorb the excess power.
Evidence suggests that if you daisy-chain two devices together, the protective capabilities of a surge protector may be compromised, and many protection warranties will void if you engage in this practice. This includes any insurance the band may advertise.
Daisy-chained power strips with surge protectors can be dangerous
You've probably been warned not to "daisy-chain" power strips, and for good reason. While power strips are much safer than they used to be, the more devices you connect to a single power strip, the more likely you are to overload the strip closest to the wall outlet.
Power strips that support high loads or exceed their rated loads can overheat and cause a fire. In some countries (eg UK) the fuse may blow before the power strip is overloaded. In other countries, there are no fuses that provide this protection.
Many power strips offer surge protection, which most of the time people think of when they use the term. You can also buy individual receptacles that provide surge protection, but even these receptacles are designed for a specific load. In many cases, low-powered devices such as phone chargers, alarm clocks, or bedside lamps are unlikely to cause problems.
