What does this symbol mean?

What does this symbol mean?

This topic has 6 replies, 4 voices, and was last updated 26 May 2023 at 07:54 by Robert Atkinson 2.

Viewing 7 posts - 1 through 7 (of 7 total)

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24 May 2023 at 19:46 #21002
Bob
Participant
@bob17059
Symbol on casing of isolation transformer
Advert

24 May 2023 at 19:46 #646387
Bob
Participant
@bob17059
What does this symbol indicate?
24 May 2023 at 20:17 #646392
KWIL
Participant
@kwil
I am sure it shows what it says. Two identical windings, 1:1 ratio, Completely isolated for safety. In other words an isolation transformer.
24 May 2023 at 20:59 #646397
Bob
Participant
@bob17059
I agree that the two overlapping circles with the the two downward pointing 'legs' represent an isolation transformer but what does the enclosing semicircle signify?
24 May 2023 at 22:48 #646404
Bill Davies 2
Participant
@billdavies2
See: Isolating transformer symbols (IEC standards).

Seems to be a slightly corrupted version of Pr01-029.

Bill
25 May 2023 at 07:15 #646419
Bob
Participant
@bob17059
Many thanks Bill. I have never come across these symbols before and they are not very intuitive. I guess the semicircle is meant to represent a hard hat that would be worn on a construction site.

Bob
26 May 2023 at 07:54 #646501
Robert Atkinson 2
Participant
@robertatkinson2
Typical IEC. Weird symbols the meaning of which is hidden in a expensive document. The linked document shows p proposed symbols, I wonder what they settled on. And no I'm not going to pay BSI £356 for EN 60417 to find out. Oh and that price is only for Part 2, Part 1 is an additional £356!

Robert.
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