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Jan
4
answered Lightbulbs burn out 3 seconds after turning on the light
Dec
19
comment Do I need to ground black gas pipe?
All grounded things in a building are REQUIRED to be connected together. The "earth" does not have a uniform voltage, so the area where your electric system is grounded may be a few volts different than the earth where your gas pipe goes. If they are not connected together, you could be shocked when touching the two grounded objects (since they are at different voltages). Connecting them together would force them to have the same voltage, removing the risk of shock.
Dec
7
awarded  Necromancer
Nov
30
comment Why does rust colored water come out of shower head?
I have experience with a shower where iron (non-galvanized IIRC) pipe was used to connect the shower valve to the bath tub spout. After each shower, water would sit there, causing rust to form.
Nov
23
comment Apartment Circuit breaker flips randomly
Examine the circuit breaker. If it has a "test" button on it, it is either a GFCI or AFCI breaker. These would be able to detect residual ground current (good for safety). But, they will sometimes trip when bad devices are connected.
Nov
21
comment Apartment Circuit breaker flips randomly
Is it an AFCI or GFCI breaker?
Nov
16
comment Can I connect ground to neutral in a 3 wire outlet?
@ArchonOSX, I agree, though it should be noted that normal circuit breakers do NOT detect the ground fault current (in the case that the neutral and chassis are shorted). An AFCI or GFCI circuit breaker is required to detect that sort of fault, but it would never be able to be detected (even with a GFCI/AFCI) in the presence of a bootleg ground.
Nov
13
comment Can I use a 50 Hz device in a 60 Hz power frequency?
McGee: The heating would be identical. All it cares about is power=V^2/R, which is independent of frequnecy. But, there could be a difference in the operation of the pump's motor.
Nov
13
answered Can I use a 50 Hz device in a 60 Hz power frequency?
Nov
13
revised How can I test if my powertool is getting enough electricity?
Note that motors can be damaged by under-voltage.
Nov
11
answered How can I test if my powertool is getting enough electricity?
Oct
24
answered 240 volt biphasic to 240 volt monophasic
Oct
14
revised Is it safe to encapsulate lead shot with epoxy?
added 63 characters in body
Oct
14
answered Is it safe to encapsulate lead shot with epoxy?
Sep
26
awarded  Yearling
Sep
14
comment Is there a length limit on grounding conductor to ground rod?
@Kris: First, understand that normally when we say frequency, we are talking about sine waves. But, lightning isn't a sine wave. It abruptly turns on, and then abruptly turns off. In order to figure out the frequency, we must mathematically represent the lightning strike as a sum of sine waves at various frequencies. The abruptness of the strike causes there to be frequency components above what you would expect (1 divided by the strike duration). The duration may be 30 us (equiv to 30kHz), but there are components at much higher frequencies (>100 kHz), limiting skin depth to <<1mm.
Sep
13
revised Is there a length limit on grounding conductor to ground rod?
Mention that #8 size cable and aluminum is sometimes permissible according to the 2014 NEC.
Sep
13
comment Is there a length limit on grounding conductor to ground rod?
@Dave, I agree that it isn't ever required to be larger than #6 copper, but it's OK for it to be larger. Also, #4 isn't that much more expensive (since the length should be short), will last longer and will provide a better ground. Looking at the code again, I see that there are some conditions where #8 is acceptable which I did not mention. Also, aluminum is permissible, but probably a bad idea due to corrosion issues.
Sep
4
awarded  electrical
Sep
3
comment What if I can not connect the ground wire of my new light fixture to an old electrical connection?
Another caveat that I ran into is that the fluorescent lamps (long tubes) that I have must be grounded because they use the enclosure as a RF shield. Leaving the case floating caused the light not to turn on reliably.