| General > General Technical Chat |
| When having 230V what is the best choice, 220V or 240V? |
| << < (2/2) |
| BeBuLamar:
In my house here in the US, the 240 is slightly more than 240V and the 120 is slightly more than 120V. |
| themadhippy:
--- Quote ---220, 230, and 240 are for all intents and purposes THE SAME THING. It is called TOLERANCES. --- End quote --- Apart from when your running lamps designed for 220/230v land on a 240v supply,the lamp life is noticeable reduced. |
| tooki:
--- Quote from: srb1954 on November 19, 2023, 10:15:46 am --- --- Quote from: Swake on November 18, 2023, 11:10:37 am ---Hi, A lot of gear (especially HP devices) can be configured for 220V or 240V input. in this case what is the best choice for the 230V countries? --- End quote --- I suggest you measure your actual mains voltage over a period of time and use the measured value as a guide to set the equipment input voltage to. It is rare that the mains is exactly at its nominal 230V and can be either higher or lower depending on your location relative to the supply transformer and other loads in your neighbourhood. At my house the nominal 230V mains is consistently above 235V so I use the 240V setting, where available on the equipment, for reduced power dissipation and a little extra margin against over-voltage transients. --- End quote --- I was going to suggest the same thing. For example: at home, my mains tends to hover around 233V, but at work it’s often around 237V. So I’d choose 240V at work for sure, at home I’d decide depending on the device and whether it’s likely to misbehave with a bit too low voltage. |
| Brumby:
When Australia changed to a 230V standard, they did it overnight, in a very clever way. . . Old: 240V +6%, -10% New: 230V +10%, -6% Do the math ... and you will smile. I suggest you select your voltage accordingly |
| tridac:
A lot of older HP test gear used linear regulators in the psu. The 5370 counter rear panel heat sinks can cause a burn when running from the uk 240v, which in reality. is often 245v or more. Even considered fitting an 20 volt or so bucking transformer to lose some of the volts to the lab. Other HP kit usually has a 240v setting and later kit with smps will be universal 115/230 and may even be more efficient at a higher voltage. An ali heat sink resistor bolted to the chassis can be good way to lose line volts in some cases. In general though, the psu seems to be the last bit of the design process, cheap and cheerful, poorly specced and rated parts, little or no ventilation, with the obvious result. Undervolting slightly is usually the best bet... |
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