Abstract
Electromagnetic Interference (EMI) is one of causes for medical malfunction and fire in hospital which lead to patient mortality and asset loss. Electromagnetic Interference effect can be minimized with good management of cable. This includes the use of good cable specification, good cable arrangement, good cable bonding and use of cable tray. This paper presents simulation results of various cable arrangement in hospital. Several types of high voltage (HV) cables, low voltage (LV) cables, and data or signal cable (D/S) cables have been selected. In combination with the use of ladder and tray, we simulated the output of D/S cables at various distances between D/S cables and LV or HV cables. Simulation results show that magnetic field generated from LV and HV cables without armour is coupled to D/S cable, which causes disturbed signal output at D/S cable. In order to maintain the quality of D/S cable output, it is required to have at least 10 cm distance between two core D/S cable and LV Cable, and 20 cm between two core D/S cable and HV cable, respectively. It is also found, that HV and LV cables with armour do not produce significant EMI to D/S cable. Based on simulation results, it is strongly recommended that armoured HV, LV and D/S cables on the tray shall be used for minimizing EMI effect in hospital. If no space constraint, non-armour cable can be used with considering the minimum distance between D/S cable and LV cable around 10 cm, as well as D/S cable and HV cable around 20 cm.
Published Version
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