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National Differences
Clause
Requirement
−
Test
Result – Remark
Verdict
Singaporean National Differences
APPENDIX Singaporean National Differences
(SS 337:2001)
(IEC Publication 60950:1999)
(IEC Publication 60950:1999)
P
EXPLANATION FOR ABBREVIATIONS
P=Pass, F=Fail, N=Not applicable. Placed in the column to the right.
General
P=Pass, F=Fail, N=Not applicable. Placed in the column to the right.
General
IT Power Systems are not allowed in the
Republic of Singapore and all clauses related to
IT Power Systems are not applicable.
Considered.
P
2.9.2
After the first paragraph,
insert
the following:
Under tropical conditions, the duration of the
humidity conditioning is 5 days (120 h) at a
temperature (t) of 40°C ± 2°C with relative
humidity of 90% to 95%
Explanation:
Conditions described in IEC
Publications 60068-2-3:1969 – ‘Test Ca: Damp
Heat, Steady State’ (temperature: 40°C ± 2°C,
relative humidity: 90% to 95%) apply to insulation
to be used under tropical conditions. The
additional requirement on humidity conditioning is
drawn from Clause 10.2 of IEC 60065:1998
See IEC 60950 report.
P
2.10.6.5
Delete
’(48 h)’
Explanation:
To be consistent with 2.9.2.
Deleted.
N
3.2.8
Replace
’23°C± 2°C’ by ’27°C ± 2°C’
Explanation:
The recommended temperature for
tropical countries is drawn from ISO 554: 1976 –
’Standard atmospheres for conditioning and/or
testing – Specifications’.
Replaced.
N
Editorial amendment:
1.2.8.6
After NOTE 2,
insert
the following:
NOTE 3 – This definition for SELV CIRCUIT
differs from the term ’SELV system’ as given in
SS CP 5.
Attention is also drawn to the following :
For a.c. power distribution systems, only TN-S
Attention is also drawn to the following :
For a.c. power distribution systems, only TN-S
and TT systems are allowed in the Republic of
Singapore.
Where the phrase ‘this standard’ appears, it
Where the phrase ‘this standard’ appears, it
should be read as ‘Singapore Standard SS 337’.
The comma has been used throughout as a
The comma has been used throughout as a
decimal marker in IEC 60950, whereas in
Singapore standards it is a practice to use a full-
point on the baseline as the decimal marker.
The IEC standard referred to shall be replaced by
The IEC standard referred to shall be replaced by
Singapore Standards as follows:
Considered.
N
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