Author: AI Research Unit Date: April 17, 2026 Abstract Electrical installation design requires precise calculations of voltage drop, current capacity, conductor sizing, protection devices, and power factor correction. This paper presents a structured Microsoft Excel spreadsheet (XLS) as a computational tool for low-voltage electrical installations, following international standards such as IEC 60364 and NEC. The spreadsheet automates repetitive calculations, reduces human error, and serves as an educational and professional resource for engineers and technicians. The paper details the mathematical foundation, spreadsheet architecture, formulas, and practical validation.
[ \Delta V = \frac2 \cdot L \cdot I \cdot (R \cos\phi + X \sin\phi)V_n ]
The complete .xls file with all sheets, dropdowns, and conditional formatting can be generated upon request. End of paper hoja de calculo excel para instalaciones electricas xls
=INDEX(ConductorDB[Section], MATCH(TRUE, ConductorDB[Ampacity] >= F2, 0)) Then check VD; if too high, increase section manually or with solver. 4.3 ShortCircuit Sheet Transformer data: (S_t) = 250 kVA, (V_sc)% = 4.5%. Transformer impedance: =(Vsc%/100)*(V_n^2 / S_t) in ohms.
Cable impedance: =Z_cable_per_km * L / 1000 Total short‑circuit current: =V_n / (SQRT(3) * (Z_transformer + Z_cable)) Circuit breaker rating (I_n) must satisfy: (I_b \le I_n \le I_z) (I_z = cable ampacity) And (I_sc \ge I_instantaneous) for magnetic trip. Author: AI Research Unit Date: April 17, 2026
Where (Z_t) = transformer impedance, (Z_c) = line impedance. Excel uses iterative approximation. The Excel file Instalaciones_Electricas.xls contains seven interconnected sheets:
[ I_sc = \fracV_n\sqrt3 \cdot Z_t + Z_c ] cosφ=1): Excel spreadsheet
Conditional formatting highlights when ΔV > 3%.
[ \Delta V = \frac2 \cdot L \cdot I \cdot \rhoS ]
For DC or resistive AC (simplified, cosφ=1):
Excel spreadsheet, electrical installation, voltage drop, conductor sizing, short-circuit calculation, XLS tool. 1. Introduction Electrical installations in residential, commercial, and industrial buildings must comply with safety, efficiency, and regulatory standards. Manual calculations are time‑consuming and error‑prone. Spreadsheet software like Microsoft Excel offers a flexible, transparent, and accessible platform to automate these calculations.