Trimble high Zs

Jim Eden 1 month ago

Hi all, I’m new to cable calculation software and I’m having some trouble with Trimble. I’m sure it must be a settings issue, but when calculating for a circuit I’m getting much higher than expected values for Zs and in particular, Z2.

If I incorporate the CPC within a multicore cable I get results similar to that calculated by hand, but when I have a separate CPC the values end up way off and I have high Zs errors.

Please help!

0 AMK 1 month ago

Hi, I don’t use Trimble but could it be due to the software applying PD IEC/TR 50480:2011 to the calculations?
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0 gkenyon 1 month ago

Jim Eden said:
I’m getting much higher than expected values for Zs and in particular, Z2.

Are these armoured cables? If so, your "by hand" calculations should also lead to a higher value (in the way that AMK said) as discussed in the IET Electrical Installation Design Guide.
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