How to measure ground resistance at three sets of points using one of three common safety analyzers.
Prerequisites
| Personnel requirements |
|---|
| Required persons | Preliminary requirements | Procedure | Finalization |
|---|
| 1 | - | 60 minutes | 5 minutes |
| Tools and test equipment |
|---|
| Item | Quantity | Part number | Manufacturer |
|---|
| Bio-design MG5 Meter (Microguard) with Milliohm Adapter | 1 | 46-194427P16 | - |
| Dale 600 or 601 (120 VAC) Safety Analyzer | 1 of these Note: Only one of these safety analyzers listed is required for this procedure. | 46-285647P1 or 46-328406G1 | - |
| Dale 600E or 601E (220 VAC) Safety Analyzer | 46-285647P14 or 46-328406G2 | - |
| Fluke ESA612 Electrical Safety Analyzer (220V) | 5453348-2 | - |
| Brass Master Padlock with Brass Shackle | 2 | 46-194427P320 | - |
| Red Warning LOTO Tag | 2 | 46-194427P322 | - |
| Multi-Locking Device (if multiple service personnel are involved) | 1 | 46-194427P313 | - |
| Digital Voltmeter (DVM) | 1 | 46-194427P284 | - |
| Consumables |
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| Item | Quantity | Part number | Manufacturer |
|---|
| Ground Wires | As needed | - | - |
| Required conditions |
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| Any required electrical code inspection. |
| Installation of the facility disconnect device. |
| EMERGENCY OFF wiring. |
| PDU primary wiring. |
| PDU subsystem power cables. |
| The power cable and ground cable are connected. Refer to Cable Routing and Power/Ground Line Connection. |
| No hard wired signal cables connected to any subsystem cabinets. Fiber optic cables may be connected and not impact this check. |
| Ground cable of patient table is connected before ground resistance check for patient table. |
| Safety |
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Before working in any GE Healthcare MR suite or performing any GE Healthcare service procedure, you must:
- Have read and understood all hazard conditions and safety requirements in the latest revision of the GE Healthcare MR Service Safety Manual (5452735).
- Have successfully completed all relevant GE Healthcare Environmental Health and Safety (EHS) courses (or for non-GE employees, equivalent workplace training courses).
- Comply with all site-specific training and workplace safety requirements.
If you have any safety concerns at any time, do not begin work or immediately stop work and move to a safe location. Immediately contact your supervisor or site safety officer for instructions on how to proceed.
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About this task
Note: Ground resistance checks are required on every site.
Table 1. Required ground resistance checks| What to test | When to test |
|---|
| Global Operator Cabinet (GOC) | After power and ground cable connection to GOC |
| Patient Table | Done after Patient Table Installation |
