A device intended for the EU consists of a digital controller and resistive
heating elements in an enclosure, single phase device.
The digital controller draws 1A (give or take for sake of discussion) and
controls a contactor that opens and closes the power on the heater and
displays system info on an LED display. The only ports are the AC mains and
a water inlet similar to a refrigerator water line. The heater draws 42A
when connected. This device is intended to be in the back room of retail
establishments and meets the safety requirements of 600335-2-85.
The question, which EMC standard applies?
55014 excludes from its scope “regulating controls and equipment with
regulating controls incorporating semiconductor
devices with a rated input current of more than 25 A per phase”. Would
this constitute a regulating control?
61000-3-2 and 61000-3-3 are for devices under 16A, which the controller most
definitely is such a device, but the complete product is not.
My best judgment is the following:
EN61000-6-1, Immunity tests called out therein:
61000-4-2, ESD
61000-4-3, Radiated RF fields
61000-4-4, electrical fast transients
61000-4-5, surge
61000-4-6, conducted RF signals
61000-4-11, voltage dips and interrupts (which doesn’t apply for devices
over 16A, see above regarding 61000-3-2)
EN61000-6-3, Emissions tests called out therein:
61000-3-11, Limitation of voltage changes, voltage fluctuations and flicker in
public low-voltage supply systems - Equipment with rated current ≤ 75 A and
subject to conditional connection
61000-3-12, Limits for harmonic currents produced by equipment connected to
public low-voltage systems with input current > 16 A and ≤ 75 A per phase
CISPR 16-2-3, radiated emissions (30MHz-1GHz)
CISPR 16-2-1, conducted emissions (150kHz-30MHz)
That seems rationale to me, but I was still asked the question:
Would it be appropriate to test the device with the heater disconnected and
treat it as a product only drawing 1A?
Thoughts/opinions welcomed. Please correct me if I am befuddled, serves me
right for answering the phone at 5PM on a Friday.
Thanks,
Doug Kramer
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