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Apr
22
awarded  Nice Answer
Apr
21
comment Minerals when draining water heater
When I drain my hot water tank (infrequently), I shut off the heater before I take a shower or run some laundry. That way I don't waste the hot water or risk burning myself.
Apr
21
comment Steel tube deflection over span
You're right, I neglected to look up the OD of steel pipe. But I think even ~1" is still too much deflection. It has a good chance of cracking / ruining the tabletop surface. And I think it's kind of a moot point because like I said it will be impossible to achieve that end condition.
Apr
20
comment Steel tube deflection over span
Using that calculator I get 1.5" with your steel pipe, which I would say is almost certainly unacceptable for a desk. Also a "fixed end" condition is going to be basically impossible to achieve. The "free end" (a.k.a. pinned end) is a much better assumption and yields a deflection of 6".
Apr
20
revised Steel tube deflection over span
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Apr
20
answered Steel tube deflection over span
Apr
19
answered What is the appropriate wire gauge for 30A DC?
Apr
16
answered Are water boilers dangerous when showering?
Apr
16
comment Mobile Home Feeder Cable for Cabin
@Tester101: interesting. if the main panel and sub panel both have grounding rods what's the point of the ground wire between them?
Apr
16
comment Mobile Home Feeder Cable for Cabin
I am not an electrician but you should only need 3 wires, right? Since the main disconnect and sub panel will be in separate buildings you will want to have grounding rods at each location and only need hot 1, hot 2, and neutral wires.
Apr
5
comment Is framing with screws legal?
@Tester101: R301.1.2 says: "The requirements of this code are based on platform and balloon-frame construction for light-frame buildings. [...] Other framing systems must have equivalent detailing to ensure force transfer, continuity and compatible deformations." The specific design criteria are given in the rest of R301 that an engineer may use to design the structure.
Apr
5
answered Is framing with screws legal?
Apr
5
comment Is framing with screws legal?
@Tester101: well to be more general, if the building is anything other than platform or ballon light framing, section R602 doesn't apply and the structure needs to be designed by an engineer. Maybe the owner is just using 2x4s as cladding and to hang drywall from? It's not clear to me.
Apr
5
comment Is framing with screws legal?
@BenWelborn: OK well if this is a commercial structure than residential building codes do not apply, you would want to look at the IBC. But the fact remains that you have not really established whether this is a "wood framed structure" or just a building that has some wood in the exterior wall.
Apr
5
comment Is framing with screws legal?
I would not be so quick to leap to this conclusion. If the exterior walls are not load bearing and there are 8x8 posts used for the structure it's not clear to me that section R602 is even applicable. This is clearly not a "regular" wood-framed house... maybe it's heavy timber construction, maybe something else. Also it is certainly possible for a screw to be designed to have the same shear strength as a nail. Did the builder just pull something off the shelf at Home Depot or was it spec'd by the engineer? We don't know.
Apr
5
comment How to change a switched outlet to a half-hot outlet?
Legality aside, this would be a good opportunity to wrap a band of black tape around the white wire at the nut you've labeled "A".
Apr
4
revised Why do my LED lights stay on, even when the switch is off?
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Apr
3
comment Electric baseboards draw electricity, but produce no heat
Well something here doesn't add up, so I would start from the top and re-evaluate all of your conclusions. FYI the power bill is not really granular enough to draw any conclusions from. Are you sure you have isolated which breaker(s) control the heaters? (The panel labels may not be correct.) Are you sure there is no other controls/thermostats that may be interfering with your testing? Are you sure you are doing the meter calculations correctly? (If you have an analog meter, reading them can be tricky.) Is there another source of heat in the house that may be responsible for the power usage?
Apr
3
comment Electric baseboards draw electricity, but produce no heat
6kw is a huge amount of heat to "go missing". Are you sure you are interpreting the meter correctly? Are you sure you are checking the relevant baseboards?
Mar
28
comment How can I calculate covered area under a single-slope roof?
This is true but you have really taken the "long way around". cos(A) = b / c is basically the definition of cos and give the answer immediately.