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1.what is the contact resistace of CB ?

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1.what is the contact resistace of CB ? 2.radioactivity should be mesured with---------?..

20 micro ohm. it may be less than 20 micro ohm.

 Is This Answer Correct ? 16 Yes 4 No

1.what is the contact resistace of CB ? 2.radioactivity should be mesured with---------?..

Contact resistence of breaker is depending upon how many contacts are comes between the contact resistence meter leads. Count the contacts and calculate the value accordingly 6 to 10 micro ohm for one contact.

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1.what is the contact resistace of CB ? 2.radioactivity should be mesured with---------?..

at the time of contact resistance B/W fixed and moving
contact it is accept up to 100micro ohm for new breaker for
fairly old one is 200 microohm

 Is This Answer Correct ? 1 Yes 3 No

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