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PIS-CS-009/Critical systems

Completing the Medical IT system

An isolating transformer alone does not make a Medical IT system complete.

Hospital ICUHealthcare3 min read
Medical IT supply with monitoring and alarmEngineered approach for PIS-CS-009. Integrate insulation and transformer monitoring with the supply. Provide local indication, alarm and coordinated circuit protection. Functionally test first-fault indication and protective coordination. Conceptual teaching detail, not an as-built drawing or construction instruction. © PIS Engineering Academy · All rights reserved.PIS ENGINEERING / CASE 009Medical IT supply with monitoring and alarmENGINEERED APPROACHISOLATING TRANSFORMERCIRCUITSMEDICAL LOADIMDALARMMONITOR → LOCAL INDICATIONIsolation, monitoring, alarm and protection form one architecture.1231Integrate insulation andtransformer monitoring withthe supply.2Provide local indication,alarm and coordinated circuitprotection.3Functionally test first-faultindication and protectivecoordination.READ THE DETAILEquipment, joints and current-path interfaces are shown in context.Conceptual teaching plate · no project dimensions or acceptance limits impliedPIS / REV 03© PIS Engineering Academy · All rights reserved

Engineering concept / vector field note

01

The field problem

Hospital ICU — Medical IT

An ICU had an IT medical supply concept but lacked the complete monitoring/protection package.

why the obvious answer can be misleading

The purpose of a Medical IT arrangement is continuity of supply under a first fault with controlled monitoring. Without insulation monitoring, alarm/indication and coordinated protection, the operational philosophy is incomplete.

02

Why it failed

The purpose of a Medical IT arrangement is continuity of supply under a first fault with controlled monitoring.

Without insulation monitoring, alarm/indication and coordinated protection, the operational philosophy is incomplete.

03

Follow the engineering

Switch between the field condition and the engineering concept. Trace the path and examine what changes.

Inspect the engineering detail

Medical IT supply with monitoring and alarmEngineered approach for PIS-CS-009. Integrate insulation and transformer monitoring with the supply. Provide local indication, alarm and coordinated circuit protection. Functionally test first-fault indication and protective coordination. Conceptual teaching detail, not an as-built drawing or construction instruction. © PIS Engineering Academy · All rights reserved.PIS ENGINEERING / CASE 009Medical IT supply with monitoring and alarmENGINEERED APPROACHISOLATING TRANSFORMERCIRCUITSMEDICAL LOADIMDALARMMONITOR → LOCAL INDICATIONIsolation, monitoring, alarm and protection form one architecture.1231Integrate insulation andtransformer monitoring withthe supply.2Provide local indication,alarm and coordinated circuitprotection.3Functionally test first-faultindication and protectivecoordination.READ THE DETAILEquipment, joints and current-path interfaces are shown in context.Conceptual teaching plate · no project dimensions or acceptance limits impliedPIS / REV 03© PIS Engineering Academy · All rights reserved

Case 009 · Engineered approach

100%
Medical IT supply with monitoring and alarmEngineered approach for PIS-CS-009. Integrate insulation and transformer monitoring with the supply. Provide local indication, alarm and coordinated circuit protection. Functionally test first-fault indication and protective coordination. Conceptual teaching detail, not an as-built drawing or construction instruction. © PIS Engineering Academy · All rights reserved.PIS ENGINEERING / CASE 009Medical IT supply with monitoring and alarmENGINEERED APPROACHISOLATING TRANSFORMERCIRCUITSMEDICAL LOADIMDALARMMONITOR → LOCAL INDICATIONIsolation, monitoring, alarm and protection form one architecture.1231Integrate insulation andtransformer monitoring withthe supply.2Provide local indication,alarm and coordinated circuitprotection.3Functionally test first-faultindication and protectivecoordination.READ THE DETAILEquipment, joints and current-path interfaces are shown in context.Conceptual teaching plate · no project dimensions or acceptance limits impliedPIS / REV 03© PIS Engineering Academy · All rights reserved

Scroll to inspect. Numbered details match the notes below the drawing. Conceptual geometry; use the case text for the engineering requirements.

What changes

Complete the Medical IT architecture with the required insulation monitoring, local indication/alarm, transformer monitoring and final-circuit protective coordination appropriate to the medical location.

Teaching schematic · not to scale© PIS Engineering Academy · All rights reserved
04

Correction & verification

Complete the Medical IT architecture with the required insulation monitoring, local indication/alarm, transformer monitoring and final-circuit protective coordination appropriate to the medical location.

Verification recorded in the case

  • Functional tests must prove alarm behaviour, first-fault monitoring and protective-device coordination.
  • Record as-built topology and connection points.
  • Repeat the measurement or functional test under a defined condition.
  • Confirm continuity and mechanical integrity of the corrected path.
  • Document instrument/setup, environmental condition and test method.
  • Close the NCR/case only when evidence supports the conclusion.
References & project context

References are reproduced from the PIS casebook. Select the governing edition and project acceptance criteria before using them for a design. The diagrams explain the concept, rather than define construction dimensions.

IEC 60364-7-710 and project healthcare requirements.

PIS reviewed field handbook · PIS-CS-009

View the original social card
05

The engineering lesson

Critical continuity requires monitoring as much as isolation.

Take the lesson into your next design review.

Keep exploring

Connected lessons.

All cases
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The building had earthing. The data center did not have a grounding architecture.

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Critical systems

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Critical equipment moved. Its reference earth had to move with it.

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36

Critical systems

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Two earth systems did not create isolation. They created uncontrolled references.

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