9 Magnet Room Electrical and Grounding Requirements
9.1 Electrical Line and Filter Requirements
1. RF Shielded Room vendor and electrical contractor must design and install all electrical
lines through the RF shielding
2. The RF Shielded Room vendor must supply electrical line filters for all lines through the RF
shielding (excluding electrical lines through the GE supplied Penetration panels) to ensure
compliance with the RF Shielded Room attenuation requirements
3. Electrical line filters must be located outside the 200 gauss (20 mT) line
9.2 Lighting Requirements
1. All lighting fixtures and associated components must meet all RF Shielded Room and RF
Grounding requirements (e.g., track lighting is not recommended due to possible RF noise)
2. All removable lighting fixtures and associated components must be non-magnetic
3. All lighting must use direct current (the DC must have less than 5% ripple)
4. 300 lux must be provided at the front of the magnet for patient access and above the
magnet for servicing
5. Fluorescent lighting must not be used in the Magnet Room
6. Lighting must be adjusted using a discrete switch or a variable DC lighting controller
7. SCR dimmers or rheostats must not be used
8. DC LED lighting may be used if the DC power converter is located outside the Magnet
Room RF Shield
9. Battery chargers (e.g., used for emergency lighting) must be located outside the Magnet
Room
10. Short filament length bulbs are recommended
11. Linear lamps are not recommended due to the high burnout rate
9.3 Grounding Requirements
1. If customer prepares the RF Common Ground Stud (customer supplied option), it is
connected with Penetration Wall of ISC. (refer to
)
2. All RF Power Filters over 30V (incomming) must be located within 40 in. (1016 mm) of the
RF Common Ground Stud
3. All power lines into the RF shielded room require an RF filter
4. All electrical devices (e.g., outlets, light fixtures, etc.) must have a ground wire from device
power source and be grounded to the RF Shield at the RF Common Ground Stud
5. Resistance between any two grounded devices must not exceed 0.1 ohm to ensure equal
potential ground system within the Magnet Room.
SIGNA Voyager Pre-Installation
Direction 5680008–1EN, Revision 2
Chapter 3 Magnet Room
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