Relevance. The transformer steps down the mains 230V to 24V and isolates the output from the mains. On paper, yes, you can. If using a transformer to change the voltage in Germany, I would use an American extension cord after the transformer and then you could plug in several 110V items. Pressing a lot of current through a thin cable causes a big number of electrons to bump into the metal atoms of your extension cord. Two-prong plugs aren't grounded, while three-prong plugs are. With the 24V output you are safe from electrocution if the lights or wiring become damaged or water is spilled on them (but not the transformer), unlike the types that plug direct into the mains. If purchasing the extension cord in Germany, I would use a German one before the transformer. If you must use a power strip, make very sure it doesn't have surge protection built in. Answer Save. I currently have an extension cord which has 2 other plugs in it but very little used. Most extension cords have plugs with either two or three prongs. LED Transformer 30V LED Controller Class 2 Power Supply, IP44 Waterproof Low Voltage Transformer US Plug For Christmas Light, String Light Indoor Outdoor Use (1) 4.1 out of 5 stars 442 $12.98 $ 12 . Can You Plug a Surge Protector Into an Extension Cord? Anonymous. I would plug the transformer into the extension cord (since it can't reach the wall outlet) which would in turn plug into wall outlet. Never use a surge protector on the 110 volt side of a 220-to-110 volt step-down transformer if the power plug can be plugged in two different ways. The biggest thing is making sure the extension cord can handle the same amount of load as the surge protector (or more). Plenum or Riser-rated LVT is commonly run in t-bar ceilings for class 2 circuits. As to the extension cord. The cord is 64" long with the connectors spaced 18" apart. It will be fine to plug them into a 4-way extension lead. … The third prong, which fits into the round hole beneath the two vertical slots on a typical 120-volt outlet, leads to the ground wire in an electrical circuit and significantly reduces the risk of electric shock or fire. Plug-in transformers have internal fuses, which makes this installation a class 2 circuit. By you stating that you are “qualified and certified”, and then continuing on to say that you can plug one extension cord into another, you may want to consider important things like product listing/labeling requirements, and the National Electrical Code section 110.3(B), which requires people to follow listing/labeling requirements. The … There is no downside in this arrangement, but a two wire/prong extension would do the same thing. share | improve this answer | follow | answered Jul 3 '16 at 4:40 Simply place the cord on your tree or mantel, attach the transformer (included), connect ornaments and plug the transformer into wall outlet. It could kill you. 1 Answer. The transformer in that kit is designed for outdoor use, the cord plug should be protected with an "in-use" type receptacle cover. When you plug in an extension cord, power supply essentially has to increase the power in order to reach the space heater. 10 years ago. The cord resembles an extension cord with four connectors along the cord that will power up to four ornaments. 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