Wikipedia:Reference desk/Archives/Miscellaneous/2022 January 15

= January 15 =

Skyscraper cost breakdown
i.e. x% is goods and y is services, or x% is workers, y% is buying stuff that'll become part of or attached to the building, z% is land, w% is energy and so on or x% is foremen compensation, y% is crane rental.. something like that.

Does anyone know what the ranges are and what are the most important causes of the variation? Some are obvious like high local labor costs might reduce materials cost (by percentage) but some aren't (i.e. does height or steel vs concrete significantly affect how much went to renting and how much to buying?) Sagittarian Milky Way (talk) 03:19, 15 January 2022 (UTC)
 * It will vary by location, and design. A lot. DOR (HK) (talk) 01:33, 16 January 2022 (UTC)
 * Indeed. In New York they even demolished a box about 200x200x700 just to avoid land prices while Jeddah Tower land seemed to be in the middle of nowhere. Sagittarian Milky Way (talk) 02:34, 16 January 2022 (UTC)

Japanese wattage
What's the highest wattage normally allowed for appliances that plug into 100 V household outlets in Japan? --Lazar Taxon (talk) 19:22, 15 January 2022 (UTC)


 * The most common standard in Japan is JIS C 8303, which is equivalent to NEMA 1-15. The latter is supposed to support 15 A safely at 120 V, or 1800 W. That should be a safe wattage if the wattage is given assuming a 100 V inlet for the appliance. If the appliance rating is based on the US' 120 V, a nominal power P at 120 V will correspond to an actual power of (100 V/120 V)2P at 100 V, so then a nominal 2600 W determined for the US voltage should still be fine with the voltage in Japan. Here is a 2400W patio heater offered for sale. --Lambiam 21:42, 15 January 2022 (UTC)
 * But 2400 W is more than the 1800 W you say the outlet supports? -- SGBailey (talk) 07:20, 19 January 2022 (UTC)
 * The ad offers three options for the plug: UK, EU and US, the latter at a higher cost, presumably because it is rated for a higher wattage than the JIS C 8303 plug. The question is, however, not about plugs but about outlets and asks for an upper bound. While I don't know the answer to that question, my plug-based calculations and the ad each suggest a lower bound for that upper bound: the upper bound should be "somewhere North of" 2400 W. --Lambiam 09:44, 19 January 2022 (UTC)