Rules and Guidelines
Want to participate in the discussions? Please read our Community Rules and Guidelines. Need some help? Visit Support and Answers.

  • State Not Answered
  • Locked Locked
  • Replies 2 replies
  • Subscribers 9 subscribers
  • Views 259 views
  • Users 0 members are here
Options
You may also be interested in
This discussion is locked.
You cannot post a reply to this discussion. If you have a question start a new discussion

Protective Conductor Current for Apple iMac desktop computers

FE_Tom
Hi,


My first post here...hoping someone might have experience with the earth leakage current of Apple iMac desktops?  Can anyone tell me what leakage current they produce?  Apple themselves don't seem to have the data to hand...  I have anecdotal evidence that 15-20 of them don't trip a 30mA RCD so, assuming the RCD in question is operating as it should, it can't be more than about 1.5mA but needs to be a fair bit less than that to satisfy the regs if they've got them all on one RCD...


Thanks!

Tom


Parents
  • 0
    Also be aware that the waveform of the current to earth will have  50Hz component that will be less than the 3mA, as noted probably quite a bit less, but will also have high frequency spikes at the switching frequency, so ~ 100s of kHz, that have a peak amplitude far higher, but are of such short duration as to be safely ignored. But cause confusion if you use a scope and a current probe to make the measurement.

    A flick of the meter on the capacitance range between L and E pins of the plug will give you a first guess as to the filter structure. At 230V and 50Hz, given that 10nF is about 300 k j ohms, you can allow for a touch under a milliamp per 10nanofarads.
Reply
  • 0
    Also be aware that the waveform of the current to earth will have  50Hz component that will be less than the 3mA, as noted probably quite a bit less, but will also have high frequency spikes at the switching frequency, so ~ 100s of kHz, that have a peak amplitude far higher, but are of such short duration as to be safely ignored. But cause confusion if you use a scope and a current probe to make the measurement.

    A flick of the meter on the capacitance range between L and E pins of the plug will give you a first guess as to the filter structure. At 230V and 50Hz, given that 10nF is about 300 k j ohms, you can allow for a touch under a milliamp per 10nanofarads.
Children
No Data

Join us to get the best from IET EngX.

Joining EngX lets you personalise your experience so you stay up to date on the topics that interest you, plus you’ll be able to make connections who are looking to collaborate, exchange ideas and more.

Join us Not now

Community Rules & Guidelines