Means of Operator Protection, or MOOP, is a crucial safety parameter when it comes to medical power supplies. This safety standard aims to protect anyone who will be operating the final equipment that the medical power supply will be present in. This includes doctors, nurses, and other clinicians.
MOOP was introduced as part of the 2006 update for the IEC 60601-1 standard which outlines the ‘general requirements for basic safety and essential performance’ of medical electrical equipment. This IEC 60601-1 standard is crucial for medical power supplies as it provides minimum standards required to ensure proper safety in a healthcare environment.
When it comes to power supplies, they must meet the following classifications in order to meet basic insulation standards (1xMOOP) or reinforced insulation standards (2xMOOP).
- To meet 1xMOOP, the power supply must have isolation of 1500VAC, creepage of 2.5mm, and clearance of 2mm.
- To meet 2xMOOP, the power supply must have isolation of 3000VAC, creepage of 5mm, and clearance of 4mm.
Isolation is the separation of incoming high voltage (mains) to the low voltage output. Having proper isolation helps prevent voltages from passing between components and it can help prevent electrical shock.
Creepage and clearance offer space between conductive parts that are present in a power supply. Proper creepage and clearance in a medical power supply will prevent deterioration and dielectric breakdown, respectively, within the supply. The chart below outlines the minimum air clearances providing MOOP from the mains part.
Table 1: Minimum Air Clearances Providing MOOP from the Mains Part
|
Working Voltage – Up to and Including |
Nominal Mains Voltage ≤150V (Mains transient Voltage 1500V) | 150V < Nominal Mains Voltage ≤ 300V (Mains Transient Voltage 2500V) |
300V < Nominal Mains Voltage ≤600V (Mains Transient Voltage 4000V) |
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|
Voltage Peak or DC |
Voltage r.m.s. (sinusoidal) | Pollution Degrees 1 and 2 | Pollution Degree 3 | Pollution degrees 1, 2, and 3 |
Pollution degrees 1, 2, and 3 |
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|
V |
V | One MOOP | Two MOOP | One MOOP | Two MOOP | One MOOP | Two MOOP | One MOOP |
Two MOOP |
|
210 |
150 | 1.0 | 2.0 | 1.3 | 2.6 | 2.0 | 4.0 | 3.2 |
6.4 |
|
450 |
300 | 1 MOOP 3.2, 2 MOOP 6.4 | 3.2 |
6.4 |
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|
840 |
600 |
1 MOOP 3.2, 2 MOOP 6.4 |
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|
1400 |
1000 |
1 MOOP 4.2, 2 MOOP 6.4 |
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|
2800 |
2000 |
1 or 2 MOOP 8.4 |
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|
7000 |
5000 |
1 or 2 MOOP 17.5 |
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|
9800 |
7000 |
1 or 2 MOOP 25 |
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|
14000 |
10000 |
1 or 2 MOOP 37 |
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|
28000 |
20000 |
1 or 2 MOOP 80 |
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* Air clearances for working voltages above 20kVr.m.s. or 28 KVDC can be prescribed by particular standards if necessary.
Note: Air clearances are a function of peak voltage in the circuit. The r.m.s. voltage column is provided for the special case where the voltage has a sinusoidal waveform.
Wall Industries has a wide range of medical products compliant to IEC 60601-1 and MOOP. We can also design custom supplies that will meet your unique requirements along with these safety standards. Get in touch with us to discuss your medical power supply requirements.
To learn more about MOOP & IEC 60601-1, check out our article: IEC 60601-1 the ultimate safety & performance guide
