A many weeks ago I demanded a power strip in my home office monitor 2400 heater. The outlet in question is located behind a form press so it would need a low profile draw. I jumped on Amazon to buy a swell suppressor strip. That’s when I noticed strips with rotating entrapments. I ’ve always had some apprehensions about entrapments like that, though I could noway relatively put my cutlet on why. Looking at the reviews on this particular draw, I plant some scary issues Monitor 2400 Heater.
Prints of melted entrapments, melted outlets, and cries of “ fire hazard”. So I did what any crazy hacker would do – bought two power strips. One with a fixed right angle draw to use in my office, and one with a rotating draw to tear down.Swell suppressors, power strips, outlet strips, they’ve numerous names. Coach’s Laboratories (UL) calls them “ Relocatable power gates”. They all have several outlets, utmost have a circuit swell of some kind outside, and some have circuits for swell repression.
These are some of the most common bias to find in the ultramodern home. Numerous of our houses were designed and erected ahead compass sound, string boxes, computers, modems, cell phone dishes, tablet dishes, and all our other ultramodern conveniences. There were n’t as numerous electrical loads, so the houses did n’t have numerous outlets. Power strips break this problem.
The Death of Monitor 2400 Heater
After a couple of days, I had my strips in hand. I anticipated the draw to rotate formerly – perhaps 270 degrees. That would indicate there were cables connecting the rotating head to rest of the draw. Not so – this draw would spin round and round all day long Monitor 2400 Heater.
The draw rotates 360 degrees, yet still allows the hot, neutral, and ground cables to stay connected. It does this with the help of slip rings. Slip rings are bias that transmit one or further electrical signals across a rotating joint. Large slip rings can carry 100 or further separate circuits. Utmost auto alternators use slip rings to supply DC excitation current to the rotor.
Mechanically they’re close relatives to commutators, used to transmit power to DC motors. The difference is that a single slip ring is a single connection, where a commutator is a switching device — in a motor it commutates current to one of several coils. Packaged slip rings used to be precious, hard-to- find particulars. Thanks to globalization, you can pick them up at Amazon. A twelve- circuit slip ring will run you$9.99 packed to your door Monitor 2400 Heater.
The thing with slip rings is that they’re mechanical bias. They wear, they can shatter, and the connections made across them can comeintermittent.However, it’s a good idea to put your power force circuit after the ring, and include enough capacitance to soak up any intermittent connections, If you ’re powering a circuit through a slip ring. I ’ve seen aged FPGA chips latchup and toast up enough to desolder themselves off a PCB due to power transients caused by a bad slip ring.
Assaying the Case mThe Death of Monitor 2400 Heater
I knew I would be tearing down this connector, but Belkin gave me plenitude of information before I got out my screwdriver. Published on the draw itself was PATENTED USA Monitor 2400 Heater. The innovator of this particular rotating draw design is Jonie Chou, and Belkin has certified the patent. Belkin also has their own patents on analogous bias, utmost constructed by John Wadsworth. In fact, there are 17 references to Jonie Chou’s patent from Belkin assigned patents. It’s safe to say that Belkin is heavily invested in rotating entrapments and outlets.
I kept the‘921 patent close by as I tore down the rotating draw itself. The 4 screws were easy to remove. The draw did n’t come piecemeal however. It was fused or ultrasonically welded. I had to pry it piecemeal using a mileage cutter blade as a wedge. The construction of the draw nearly follows Figure 1 in the patent. Springs hold the two rings in place number 5 for neutral and 6 for ground. Hot is a shaft on the draw end which rotates in a sleeve on the cord end.
The neutral side has a bitsy contact patch on the slip ring – I measured it at2.24 mm x1.24 mm. The rings themselves are0.7 mm thick. Comparing the construction to the failure photos from the Amazon reviews paints a enough clear picture. The neutral slip ring forms a resistive connection. This creates heat, softening plastic, and ultimately causes bending as the connections fail. The ground captain should back up the neutral, but only if the connection fully fails. At that point, the plastic is formerly softened. I ’d be curious to see how numerous people have problems using these bias with Ground Fault Circuit Interrupter (GFCI) outlets.
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Burned due to bending Neutral fell fully out of this failed draw Note the impeccably melted figure of the neutral connection Another melted draw Ohms is the Law Monitor 2400 Heater
How does this be? Let’s run the figures with a office beacon. To keep the effects simple, we ’ll use a 60 W incandescent light bulb. Ohms law tells us that 60 W is0.5 A at 120 V. The bulb’s resistance is around 240 Ω. Typically the voltage drop over the wiring is fairly small. But say the resistance at the slip ring is 10 Ω. Now we’ve a total resistance of 250 Ω. Current drops to0.48 A, and power to57.6W.
V and2.3 W of power are now being dropped across that 10-Ω cargo. That does n’t sound like much, but where does the heat go? The slip rings heat up. Some of the heat is carried down by the cables, but not all of it. The rest is ditched into the plastic, which starts to soften. The softening plastic allows everything to start moving. The slip rings and connections slide piecemeal. The draw blades end up at odd angles. Eventually, the connection starts to break The Death of Monitor 2400 Heater.
A many microns of space opens up between the connections, which is easy for 120 V to bow over. Bending thresholds, Monitor 2400 Heater jilting further heat into the system, and furnishing an ignition source. From then one of two effects be – the soft scorched plastic moves enough to break the connection, or effects catch fire.
The strange thing then’s that Belkin knows about the problem. Back in 2009, Belkin recalled swell defenders with rotating entrapments. The problematic bias had all been manufactured in 2003. Whatever the manufacturing issues were, they were fixed to Belkin’s satisfaction, and the company is still making rotating entrapments. My device, in particular, had a manufacturing date of June 2017.
The problems persist however. Filmland of melted entrapments are each over the Amazon review runners – and not just the recall bias. These are new bias, bought this time. The consumer product safety board has five reports of failed Belkin swell suppressors onrecord.In September a Houston news show delved issues with a failed swell suppressor, but did n’t get veritably far with Belkin — still, this case seems to be one of a failed swell suppressor PCB, not the draw itself.
Through all of this, it’s important to note that the Belkin device and its draw are Underwriters Laboratories (UL) listed, so the bias have been tested and plant to be safe by at least one lab Monitor 2400 Heater. While Hackaday does n’t have failure statistics for this particular model, it might be worth UL taking a alternate look at the design The Death of Monitor 2400 Heater.
This kind of thing can be with any connection. The difference between the Belkin draw and traditional entrapments is that the rotating slip rings give numerous further points of failure. AC mains entrapments take a lot of abuse. They get yanked out by their cords. They ’re banged by cabinetwork Monitor 2400 Heater. They’ve to handle erosion, dust, and muck erecting up on their blades. They take heating and cooling cycles as high current loads switch on and off. All this happens over times, indeed decades in some cases. So why add multiple points of failure to a system which is going to be abused The Death of Monitor 2400 Heater?
Belkin has formerly been through a recall due to this rotating design. Judging by the prints on Amazon, they might do well to consider revamping the rotating draw fully – ahead someone loses their shop, their home, or worse. That said, they ’re not the only company producing rotating entrapments. Searching Amazon for “ 360 draw” reveals several other agents of the patent. Companies similar as 360 Electrical are erecting outlet strips where every outlet rotates. Are any of them safe The Death of Monitor 2400 Heater?
As for me, I installed the fixed draw Belkin swell suppressor in my office. As for the alternate strip, the rotating draw will soon be cut off and replaced with a draw from the tackle store and the swell suppressor will live out its days powering the computer in my shop The Death of Monitor 2400 Heater.