Question on IEC 60601 clause 15.5.1.1 (transformer overheating)

Roland chung

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#1
Hi all,

Clause 15.5.1.1 (transformer overheating) in A1:2012 states that protective devices should be included as part of the short circuit test and overload test provided that:

- the component is one with High-Integrity characteristics, and
- 2 MOOP are provided between the output contacts of the transformer up to the component with High-Integrity characteristics.

For the first dash, it is not easy to determine a component is High-Integrity or not. From the rationale of clause 4.9, there are some steps and additional considerations. There are several different types of protective devices, such as fuses, PTCs, breakers and ICs. It seems that if we identify fuses as High-Integrity Component, most people would say OK. But when it comes to the PTCs, it would be totally other case I think.

For the second dash, it would require at least 2 mm of air clearance (2 MOOP) from Table 15 even for 12 VAC output (rated mains voltage 230V, pollution 2). Under the same conditions, Table 12 requires 1.6 mm (2 MOPP). But my instinct is that both 2 mm and 1.6 mm are too large. According to IEC 60664, 1.0 mm for air clearance is enough (transient value 1500V for secondary circuit). The clearance 1.0 mm derived from IEC 60664 is exactly the same as the creepage derived from Table 16 (2 MOOP).

Could you please share your point of view? Thanks!

Regards,
Roland
 
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