CT Burden Resistors?

[wci68]

I'm looking for some quick confirmation here regarding whether Brultech's CTs have their own burden resistors.

My guess would be that Type-A CTs which provide a "voltage output" have their own burden resistors and that Type-B CTs which provide a "current output" do not have their own burden resistors. The GEM itself provides burden resistors for the latter case.

Is this correct?

Also, I seem to remember seeing a reference to datasheets for at least some CTs, but I haven't been able to actually find any. In particular I am curious to the turn ratios. For those with burden resistors, some details regarding the resistance value (or output range/ratio) would be of interest. Would anyone have such references?

[ben]

That's correct, basically the Micro-CTs are made to be as small as possible so they don't contain the internal burden resistor.

The GEM has burdens located on ports 2,3.

If you connect up a Micro-CT on 1,2 or 3,4 you can cause adverse affects to your GEM, such as overloading other channels.

[mwareman]

Ben,

Related question. If I need to disconnect a Micro-CT - without internal burden resistors can dangerously high voltages be present on the CT leads while disconnected - if the circuit breaker is not shut off?

I'd prefer to not have to shut off the breaker - but have been out of an abundance of caution.

Michael.

[ben]

Ben,

Related question. If I need to disconnect a Micro-CT - without internal burden resistors can dangerously high voltages be present on the CT leads while disconnected - if the circuit breaker is not shut off?

I'd prefer to not have to shut off the breaker - but have been out of an abundance of caution.

Michael.

Our Micro-CTs don't put out dangerous voltage. You may feel a slight tingle at most if you touch the ends.

[mwareman]

Thanks! Good to know.