P.S. I believe the North American equivalent is Phase and Neutral, (or Phase and Phase for 230V outlets) but I might be wrong there.
The Chinese have no ehtics, copy anything to make money, including trademarked safety symbols, CE, UL, VDE, TUV.
Nothing printed or claimed on a Chinese product has any credence including safety/PFC/EMI regulation or compliance testing.
Jon
About the only thing stamped on a chinese product you can trust to be genuine is "made in china"
P.S. I believe the North American equivalent is Phase and Neutral, (or Phase and Phase for 230V outlets) but I might be wrong there.
Hot and Neutral typically. "Phase" might be used in industrial settings where you typically have 3 phase power but you don't often see that in a residential application.
About the only thing stamped on a chinese product you can trust to be genuine is "made in china"
In North America 240V circuits are fused and switched on both sides because both sides are live 120V to neutral with a split phase system.This fusing concept is curious. The fuses don't always blow both at the same time, right? If one of the fuses is blown, the second wire will still remain live. What's the point of fusing both then?
It's pretty much futile the way things stand currently. You could play whack a mole reporting products until your life expires through natural causes without making a dent.
If fuses are used, they protect the WIRING from a fault to ground.
The Chinese have no ehtics, copy anything to make money, including trademarked safety symbols, CE, UL, VDE, TUV.
Nothing printed or claimed on a Chinese product has any credence including safety/PFC/EMI regulation or compliance testing.
Jon
In North America 240V circuits are fused and switched on both sides because both sides are live 120V to neutral with a split phase system.This fusing concept is curious. The fuses don't always blow both at the same time, right? If one of the fuses is blown, the second wire will still remain live. What's the point of fusing both then?
Last time I went through UL reporting an unsafe product, it ended up the safety standard had no spec for hot running parts, a resistor at 85°C was acceptable. After a few years, it looked quite bad burned phenolic and there is no fuse in the product, so I put in the complaint - but the specific safety standard ignored these requirements common in other safety standards. It was an old UL product-specific standard.
To argue with UL, you'd have to pay for a copy of the standard and since they had already certified the product - meaning the error was on their part- it gets the cover up.
Many Western companies are importing cheap stuff from china, putting a brand name and minimal or fake safety approvals, reselling it for profit.
err a simple ohmmeter check will do I guess but it wont help the undersized wires though.
err a simple ohmmeter check will do I guess but it wont help the undersized wires though.this is why I usually bring my milliohmmeter to the pickup point to check the cables before paying for them.
A resistor running at 85C doesn't strike me as a big problem, it's common for them to be spec'd to higher operating temperature than that. Yes it will eventually cook cheap phenolic PCB, but it's not going to start a fire.
Hi,
As a rule i always use resistors at 1/2 their rated power or even less. They can get really, really hot if run at higher power.
You can definitely cook eggs on the 10 watt power resistors if the resistors are powered more than about 1/2 their rated power.
If you run one up using a power supply, you can find out fast, just watch your fingers you won't want to touch one.
... For power cords, the chinese Walmart DVD player with <20AWG cheapola power cord Intertek certified, looked terrible. I'm not sure how the IEC standard allows a "6A" rated 20AWG 0.5mm2 cord to be connected to a 15A branch circuit....