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The study analyses the standardisation in the single-line diagrams of the 19 electrical substations belonging to the CENTROSUR Regional Electricity Company. At the moment, the diversity of criteria and the absence of a single standard for the symbols used in these diagrams generates significant operational inefficiencies in the maintenance area, where technical staff face difficulties in interpreting the information during preventive and corrective maintenance activities, fault response and expansion projects. This situation leads to slow processes, misinterpretations and ambiguities that compromise the safety and efficiency of personnel. The investigation proposes the standardisation of symbols through the implementation of IEC 60617, which establishes guidelines and standardised graphic representations for critical elements such as switches, disconnectors, power transformers and other equipment that make up electrical substations. A quantitative, descriptive, correlational and cross-sectional methodology was used, through surveys applied to the substation department staff, including operational technicians and administrative personnel. Statistical analysis identified that the frequency of updating and reviewing single-line diagrams is the variable with the strongest impact on operational efficiency, showing a regression coefficient B = 0.718 with a significance value p = 0.006 (< 0.05), confirming its direct and statistically significant influence on improving electrical processes. The results demonstrate the instrument's solid internal consistency (Cronbach's ?= 0.838) and the model's high explanatory power (R² = 0.775), confirming that the standardisation of single-line diagrams plays a fundamental role in optimising operational efficiency, reducing technical errors and increasing the occupational safety of CENTROSUR staffReferences
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