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This paper analyzes the possibility of using compensated passive loops to obtain a high mitigation effectiveness of the magnetic field generated by underground single-core cables. With that aim, several loops arrangements are simulated in a case study, including new ones called enchained loops, whose geometry reminds short-circuited conductors at both ends, but with the advantage of requiring smaller compensating capacitors. The results show a drastic spot reduction in several configurations, but with the drawback of high sensitivity to parameters. This aspect should be taken into account in the final design, so a design procedure is proposed that includes measures to alleviate this problem. Eventually, a comparison using shielding with high-conductivity material is provided.