The following should be considered:

1. Provide sensing devices (temperature, coolant-flow) that are interlocked with the power source.

2. Fabricate protective enclosures from materials not adversely affected by external electromagnetic fields. Researchers should consider building a nonferrous barrier designed to prevent accidental attraction of iron objects and prevent damage to the cryostat. This is especially important for superconducting magnet systems.

3. Provide equipment supports and bracing adequate to withstand the forces generated during fault conditions.

4. Appropriately ground electrical supply circuits and magnetic cores and provide adequate fault protection.

5. Provide means for safely dissipating stored energy when excitation is interrupted or a fault occurs.

6. Provide appropriate warning signs to prevent persons with pacemakers or similar devices from entering areas with fields of greater than 0.001 Tesla.

7. Personnel exposure to magnetic fields of greater than 0.1 Tesla should be restricted.

8. When a magnet circuit includes switching devices that may not be able to interrupt the magnet current and safely dissipate the stored energy, provide a dump resistor connected directly across the magnet terminals that is sized to limit the voltage to a safe level during the discharge and safely dissipate the stored energy.

10.10.2.3 OPERATION AND MAINTENANCE

Verify that any inductor is de-energized before disconnecting the leads or checking continuity or resistance.