12. Appendix

12. Appendix

12.1 Calculation of External Wiring Resistance

Assuming that the cross section and length of tinned annealed copper wire are S(mm2), and L(m), the resistance R(Ω) of the wire is

R ≒ 0.01854×L / S

For example, for a cable whose cross section is 0.18 mm2 and length is 200 m, the resistance is R ≒ 0.01854×200 / 0.18 = 20.6 Ω

Because the current terminal of EH-PT4 doubles in both ways, the resistance also doubles 20.6 Ω × 2 = 41.2 Ω.

Because this resistance is the value when the ambient temperature around the wire is 20 °C, if the ambient temperature is over 20 °C, the resistance rises. The rise per 1 °C is about 0.4%.

In case the ambient temperature is 40 °C, the resistance is

R= 41.2 × (1 + 0.004× (40 - 20))

≒44.5 Ω

Concerning the details of resistance, investigate individually for each wire. It may be slightly different from the calculated value.

Reference

In the case of Hitachi twisted shielded cable (CO-DS-IREVV-SX,(10 pairs to 52)), the maximum conductor resistance in the cross section of 0.18mm2 under the temperature 20 °C is 121.5 ohm/km (according to Hitachi’s Guide Book).

12-1

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Hitachi EH-150 manual Appendix, Calculation of External Wiring Resistance, Reference
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EH-150 specifications

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