DSH 428 Insulation between an F-type applied part and enclosure
http://decisions.iecee.org/icons/ecblank.gif DSH 428
Insulation between an F-type applied part and enclosure
20.2 B-d and B-e
60601-1(ed.2);am1;am2
Standard(s)- (year and edition):
IEC 60601-1:1988 Ed.2 Am1+Am2
Sub clause(s): 20.2 B-d and B-e
Sheet n°: DSH-428
Subject: Insulation between an F-type applied part and enclosure
Key words: F-type, applied part, enclosure
Confirmed by CTL at its 39th meeting, in Cologne
Question:
1) Different interpretations may occur about whether to use B-d or B-e to state the correct
insulation level between an F-TYPE APPLIED PART and the ENCLOSURE.
2) B-e refers to “voltages stressing the insulation”.
What is a hazardous voltage stressing an insulation?
Decision:
B-d is always applicable for a F-TYPE APPLIED PART. U equals maximum RATED SUPPLY
VOLTAGE; or, 250V for INTERNALLY POWERED EQUIPMENT. BASIC INSULATION
required.
In addition B-e is also applicable if there is a voltage in the F-TYPE APPLIED PART. U equals
the voltage stressing the insulation in NORMAL USE including earthing of any PATIENT
CONNECTION.
页:
[1]
