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Tweakers' Asylum Tweaks for systems, rooms and Do It Yourself (DIY) help. FAQ. |
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Tweakers' Asylum Tweaks for systems, rooms and Do It Yourself (DIY) help. FAQ. |
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In Reply to: Y2 values go up to 1 (one) uf?? posted by Tweaker456 on March 1, 2014 at 12:47:35:
For consumer use, with a UL (or CSA) rating, the leakage current can only be so much.
This sets a limit on how big the capacitors in various positions can be.
If you are not concerned about receiving a UL rating, or have other special reasons to use a bigger cap, then yes, they make Y type caps that are as large as 1 uF.
Would I advocate paralleling a lot of these 1 uF caps and hanging them across the N to G? No.
These types of concerns are why I came up with my Quick & Dirty Digital AC line filter design, with two back to back transformers, and honkin big cap in the middle of the two transformers: it allows the use of a very large cap WITHOUT the excessive leakage current that can be unsafe.
RE the voltage difference between a N and G line on the AC power system when there is a significant load present, as Tweekeng has noted, the non-zero resistance of the wiring will cause a voltage differential to develop, and this can become a problem under certain circumstances.
Just because your equipment seems to read 0 volts may be misleading, as certain digital voltmeters are very insensitive to low AC voltages when in the 200V range, certain cheap analog meters also "fall off" below a certain low voltage, and read essentially zero, even when there is a few volts present. A good o'scope, properly connected and ground referenced will show this potential difference, and it is often NOT sinusoidal(which also messes with the common meters in use).
Jon Risch
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Follow Ups
- RE: Y2 values go up to 1 (one) uf?? - Jon Risch 22:13:15 03/02/14 (4)
- Voltage and resistance from n to g - Tweaker456 13:44:51 03/03/14 (3)
- Insurance Co's and who is at fault. - Jon Risch 18:52:09 03/03/14 (2)
- RE: Insurance Co's and who is at fault. - Ryelands 01:25:30 03/05/14 (0)
- caps across ac - Tweaker456 11:56:55 03/04/14 (0)
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