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Electrical Inspection & Testing Forum
Rfc Lenghth As Per Resistance Value
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<blockquote data-quote="Technician" data-source="post: 307444" data-attributes="member: 15198"><p>Have had a run through these;</p><p></p><p>190 Metres of cable, using the calculation on page 94 of the OSG</p><p></p><p>(R1 + R2) will be 0.94 ohm.</p><p></p><p>Bes got the reads right; r2 divided by r1 gives about 1.6.</p><p></p><p>SL is quite right; RFC is too long. If you multiply that R1 + R2 value</p><p></p><p>by 1.2 you get 1.128 which would be the corrected value at 70 Cel.</p><p></p><p>Now check out the allowable Zs as a live read in the OSG and see</p><p></p><p>how bad it is. And I have not even assumed what Ze is.</p><p></p><p>I am making the assumption, of course, that a B32 circuit breaker</p><p></p><p>might be in use.</p></blockquote><p></p>
[QUOTE="Technician, post: 307444, member: 15198"] Have had a run through these; 190 Metres of cable, using the calculation on page 94 of the OSG (R1 + R2) will be 0.94 ohm. Bes got the reads right; r2 divided by r1 gives about 1.6. SL is quite right; RFC is too long. If you multiply that R1 + R2 value by 1.2 you get 1.128 which would be the corrected value at 70 Cel. Now check out the allowable Zs as a live read in the OSG and see how bad it is. And I have not even assumed what Ze is. I am making the assumption, of course, that a B32 circuit breaker might be in use. [/QUOTE]
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