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Power Line Quality

I have some questions regarding how to test/determine the minimum power line quality required for a design that has two inductive loads.

BACKGROUND: ===========

- 115V 20A rated

- Device will introduce two inductive load starts at 3-10min apart. Thus, when the second inductive load starts there is already ~7-8A steady state on the line.

- Each device can have a peak inrush of up to 80A (motor starting)

QUESTIONS: ==========

- How can I verify the worst case power line conditions required for this product? What I mean is...I believe NEC will state there can't be more than a 3% voltage drop. Is that only for steady state?

- What about the peaks a line can provide? I suspect many lines at typical distances/impedances will start to current limit and voltage will sag with

80A of inrush current.

Thanks!

Reply to
Richard Bair
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This type of question has come up on the IEEE sponsored EMC group: The answers you get will apply nationally, and internationally.

=3D =3D =3D the IEEE Product Safety Engineering Society emc-pstc discussion list. To post a message to the list, send your e-mail to

All emc-pstc postings are archived and searchable on the web at

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Graphics (in well-used formats), large files, etc. can be posted to that URL.

Website:

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Can you post there? or have someone forward your email question for you?

Reply to
Robert Macy

I have sent an email to that address. I don't know what the rules are for it to be properly moderated but I will also search the web archive you mention above. Thank you.

Reply to
Richard Bair

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Close to my pool pump, at 16A.

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Probably steady state average.

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I sampled the power line when the pump was running. It looks more like saw tooth than sine wave.

Reply to
linnix

race condition between duration of inrush current and circuit breaker, check circuit breaker characteristics, thy can to 10X for a short lenght of time.

Reply to
holyhigh

There are breakers designed for motor starting loads. Look for HMI type. Stands for "high magnetic".

Reply to
tm

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