CE/European Control circuits
CE/European Control circuits
(OP)
Looking at IEC 60204 9.1.1 states that where control circuits are supplied from an ac source control transformers shall be used.
Typically on a 380-415V+N supply I will pull my 220-240Vac single phase by using a one of the phases + N.
Looks like I cannot do this.
Can anyone with experience with CE standards and CE wiring practices for industrial equipment comment.
Particular equipment is a small conveyor oven rated for 18A @415VAC which will be located in a supermarket bakery.
Thanks in advance for any help
Typically on a 380-415V+N supply I will pull my 220-240Vac single phase by using a one of the phases + N.
Looks like I cannot do this.
Can anyone with experience with CE standards and CE wiring practices for industrial equipment comment.
Particular equipment is a small conveyor oven rated for 18A @415VAC which will be located in a supermarket bakery.
Thanks in advance for any help





RE: CE/European Control circuits
The instrument transformer is a perfect place to shave off noise spikes. It provides some serious impedance to protect the system during faults. It isolates your controls from the mains. It allows you to establish a new neutral. They can be had for pocket change. A lot of them come with integral fuse blocks to provide SC/OVLD protection.
Keith Cress
Flamin Systems, Inc.- http://www.flaminsystems.com
RE: CE/European Control circuits
With the increased concern regarding arc-flash, control voltages are trending down, not up. There's a real push in some industry segments to run MCCs and all machine tool controls from 24 V dc.
I'd put the transformer in.
RE: CE/European Control circuits
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If we learn from our mistakes I'm getting a great education!
RE: CE/European Control circuits
Benta.
RE: CE/European Control circuits
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If we learn from our mistakes I'm getting a great education!
RE: CE/European Control circuits
What I need to know is this prohibited by codes/standards in European community (and UK specifically).
Control voltage will most likely be 230v whether I use a transformer or not. That is standard for my company/equipment.
RE: CE/European Control circuits
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If we learn from our mistakes I'm getting a great education!
RE: CE/European Control circuits
Keith Cress
Flamin Systems, Inc.- http://www.flaminsystems.com
RE: CE/European Control circuits
Water industry tends to be 110V for simple stuff and 24V DC for stuff with plc controls.
HVAC tends to be 24V AC if we choose or 240V if we have a mean client in the mood to choose
Mechanical handling (food factories, newspapers and distribution centres) tend to be 24V DC
Obviously other peoples experiences may vary