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Topic: CurrentCost CT clamp specs? (Read 2 times) previous topic - next topic

Vahan

Mar 14, 2011, 04:39 pm Last Edit: Mar 14, 2011, 08:45 pm by Vahan Reason: 1
Hi,

Does anyone know what are winding / ratio specs for this clamp? Does it have an internal burden resistor?



I've measured as much as 9VAC coming from it connected to a kitchen heater, so definitely gonna need a voltage divider, but I'd like to know the max first...

Update: I found the manufacturer, but the winding/ratio isn't listed :(
CT234-30M-LA

MarkT

Its rated for 75 ohm load resistor.    But you can vary this to change the sensitivity (the winding is 510 ohms from the spec).  Clearly if a few amps puts it at 7V is doesn't contain a burden resistor - its rated for 80 amps or so.
[ I won't respond to messages, use the forum please ]

Vahan

Thanks for the reply,

I've just measured resistance on the clamp terminals, reads 375 Ohms...

I'm unfamiliar with the transformer winding resistance calculation, so I was wondering why it's not 510 Ohms, any clue?


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