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Old 30th June 2012, 10:30 PM   #21
kevinkr is offline kevinkr  United States
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I'd suggest looking for the UL mark on the transformers - since the firm is UL registered it is likely to be on the transformer.

Have a look at the EU list of UL marks possibly one of these marks will be on your transformers: http://www.ul.com/global/eng/pages/c...s/mark/#europe

Also note that the pdfs show that these R-core lines don't follow the black=hot, white=neutral convention. In any event it is not critical. The best advice I can give would be to orient the connections to give the least leakage to chassis with the safety ground lifted and measuring the leakage current between the transformer and safety ground.
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Old 30th June 2012, 10:37 PM   #22
Salas is online now Salas  Greece
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They don't carry a UL nowhere, I look at one 50VA model as we post. Primary wires have 22AWG 105C 300V and yellow screen wire 20AWG 105C 600V. American Wire Gauge can be another clue?
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Old 30th June 2012, 10:45 PM   #23
kevinkr is offline kevinkr  United States
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Quote:
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They don't carry a UL nowhere, I look at one 50VA model as we post. Primary wires have 22AWG 105C 300V and yellow screen wire 20AWG 105C 600V. American Wire Gauge can be another clue?
It could be.. The manufacturer is reputable so I wouldn't think there are any big issues with these transformers. I figured they might carry the UL recognized designation, only transformers that I've seen that carry an actual approval are fully assembled isolation transformers. IIRC transformers don't get individual approvals under UL or CSA.
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Old 30th June 2012, 10:58 PM   #24
brianco is offline brianco  Ireland
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From what I can see the label does give the required info. [Click on the pic and drag it to your screen and zoom in on label.]

Transformateur R-CORE à fixation sur châssis 500VA - 2 x 24V - Transformateurs R-CORE pour châssis

They seem to be having a good discount at present on these Tx.
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Old 30th June 2012, 11:13 PM   #25
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Quote:
Originally Posted by brianco View Post
They seem to be having a good discount at present on these Tx.
Ha, try CP Clare mercury wetted relays for $3.75
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Old 30th June 2012, 11:16 PM   #26
Salas is online now Salas  Greece
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It has printed Primaire: 230V Blanc/Noir
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Old 30th June 2012, 11:32 PM   #27
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Bottom left wire is the Black, bottom right is the White primary connection.
Now which is which ?
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File Type: jpg rrrrr2.jpg (54.0 KB, 239 views)
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Old 1st July 2012, 01:26 AM   #28
qusp is offline qusp  Australia
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hmm haha the thing is symmetrical there is beginning and end on this or not? but going by my reading, if thats the right way up the right wire would indeed be the beginning wouldnt it?. it would be quite an achievement to make an RCORE that didnt pass isolation standards, the windings are completely separate.

the grain is symmetrical too yes?

if you flip it over its axis, it looks exactly the same in the other direction
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Old 1st July 2012, 01:29 AM   #29
qusp is offline qusp  Australia
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Originally Posted by brianco View Post
From what I can see the label does give the required info. [Click on the pic and drag it to your screen and zoom in on label.]

Transformateur R-CORE à fixation sur châssis 500VA - 2 x 24V - Transformateurs R-CORE pour châssis

They seem to be having a good discount at present on these Tx.
indeed they are, some even half price and the price wasnt that bad to start with
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Old 1st July 2012, 09:46 AM   #30
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beginning and end
Basically, it's a dual primary in series (just can't use them in parallel for 115Vac)
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