From the Admiralty tables, he knew copper’s resistivity at 20°C: (or 0.0175 Ω·mm²/m). The manual demanded voltage drop not exceed 3% for power circuits.
Required correction: (Q_c = Q_1 - Q_2 \approx 3.56\ \text{kVAR}) (capacitive). examples in electrical calculations by admiralty pdf
I understand you're looking for an informative story that examines examples from an "Electrical Calculations by Admiralty" PDF. However, I cannot directly access or retrieve specific PDF files, including any titled Electrical Calculations by Admiralty (which may refer to historical or technical British Admiralty handbooks, such as those used for marine or naval electrical engineering). From the Admiralty tables, he knew copper’s resistivity
Fault current: (I_{short} = 110 / 0.0856 \approx 1285\ \text{A}). I understand you're looking for an informative story
Using the formula: [ R = \frac{V_{drop}}{I} = \frac{1.65}{85} \approx 0.0194\ \Omega ]
Chief Electrician Arthur Gibbs wiped salt spray from his spectacles. Below decks, the newly installed gyrocompass was humming erratically. The Captain wanted answers. Gibbs reached for the worn, blue-covered manual: — his bible for shipboard power systems. Example 1: Cable Sizing for a Deck Winch The forward mooring winch had been tripping its breaker. Gibbs suspected voltage drop. The winch motor drew 85 A at 110 V DC (common on older naval vessels). The cable run from the main switchboard to the winch was 45 meters of two-core armored cable.
Maximum allowable drop per core: 1.65 V (two cores in series).