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Order No. 

23171

 

 
 

 
 

1.5.101 

Addition: Plugs for the connection of the 
apparatus to the supply mains shall comply 
with the Korean requirement (KSC 8305 and 
8305).  

Must be considered before 
marketing in Korea. 

7 

Addition 
EMC 
The apparatus shall comply with the relevant 
CISPR standards. 

Manufacturer has self-declared 
according to the EMC directive.  
Must be considered before 
marketing in Korea. 

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Order No.  23171 

 
 

 
 

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. 

Considered. 

2.9.2 

After the first paragraph, insert the following: 
Under tropical conditions the duration of the 
humidity conditioning is 5 days (120h) at a 
temperature (t) of 40°C 

±

 2°C with a relative 

humidity of 90% to 95%. 

Refer to PSU test report. 

2.10.6.5  

Delete “48h”. 

Considered. 

3.2.8 

Replace “23°C 

±

 2°C by “27°C 

±

 2°C”. 

Considered. 

Attention is also drawn to the following: 

1 

For a.c. power distribution systems, only TN-S 
and TT systems are allowed in the Republic of 
Singapore. 

Class III equipment. 

2 

Where the phrase “this standard” appears, it 
should be read as “Singapore Standard SS 
337”. 

Considered. 

3 

The comma has been used troughout as a 
decimal marker in IEC60950, whereas in 
Singapore standards it is practice to use a  
full-point on the baseline as the decimal 
marker. 

Consid ered. 

The IEC standards refered to shall be replaced 
by Singapore Standards as follows: 

4 

International  
standard 

IEC 60065 

IEC 60227 

Corresponding 
Singapore Standard  

SS 143 : 2000 

SS 358 : - 

Considered. 

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Order No.  23171 

 

 

 

 

 

The following is a summary of the key national differences based on 
national regulatory requirements, such as the National Electrical Code 
(NEC) ANSI/ NFPA 70-1999, which are referenced in legislation and 
which form the basis for the rules and practices followed in the 
electrical and building installations. The bi-national standard referenced 
above should be consulted for further details on the national differences 
summarized below. 

1.1.1  

All equipment is to be designed to allow 
installations in accordance with the National 
Electrical Code (NEC), ANSI/NFPA 70, and, 
unless marked or otherwise identified, the 
standard for the Protection of Electronic 
Computer/Data-Processing Equipment, 
ANSI/NFPA 75.  

Class III equipment. 

1.5.5  

For lengths exceeding 3.05 m, external 
interconnecting flexible cord and cable 
assemblies are required to be a suitable cable 
type (e.g. DP, CL2) specified in  the NEC.  
For length 3.05m or less, external 
interconnecting flexible cord and cable 
assemblies which are not types specified in the 
NEC are required to have special construction 
features and identification markings. 

Class III equipment. 

1.7.1  

Equipment for use on supply systems with a 
neutral and more than one phase conductor 
(e.g. 120/240 V, 3-wire) require a special 
marking format for electrical ratings.  
A voltage rating that exceeds an attachment 
plug cap rating is only permitted if it does not 
exceed the extreme operating conditions in 
Table 2 of CAN/CSA C22.2 No. 235, and if it is 
part of a range that extends into the Table 2 
“Normal Operating Conditions”. Likewise, a 
voltage rating shall not be lower than the 
specified “Normal Operating Conditions”, 
unless it is part of a range that extends into the 
“Normal Operating Conditions”.  

Class III equipment. 

2.5  

Where a fuse is used to provide Class 2, 
Limited Power Source (or TNV) current 
limiting, it shall not be operator-accessible 
unless it is  not interchangeable.  

No such fuse provided. 

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Order No.  23171 

 

2.7.1  

Suitable NEC branch circuit protection is 
required for all standard supply outlets, 
receptacles and medium -base or smaller 
lampholders if the supply branch circuit 
protection is not suitable.  
Power distribution transformers distributing 
power at 100 V or more, and rated 10 kVA or 
more, require transformer overcurrent 
protection. 

Class III equipment. 

3.2  

Wiring methods (terminals, leads etc.) used for 
the connection of the equipment to the mains 
shall be in accordance with the NEC.  

Class III equipment. 

3.2.1  

Power supply cords are required to have 
attachment plugs rated not less than 125 
percent of the rated current of the equipment.  

Class III equipment. 

3.2.3  

Permanent connection of equipment to the 
mains supply by a power supply cord is not 
permitted.  

Not permanently connected 
equipment. 

3.2.5  

Power supply cords are required to be no 
longer than 4.5m in length. 
Flexible power supply cords are required to be 
compatible with Article 400 of the NEC.  

Class III equipment. 

3.2.8  

Permanently connected equipment is required 
to have a suitable wiring compartment and wire 
bending space.  

Class III equipment. 

3.3  

Wiring terminals and associated spacings for 
field wiring connections shall comply with CSA 
C22.2 No. 0.  

Class III equipment. 

3.3.3  

Wire binding screws are not permitted to attach 
conductors larger than 10 AWG (5.3mm

2

).  

Class III equipment. 

3.3.4  

Terminals for permanent wiring, including 
protective earthing terminals are required to be 
suitable for U.S./Canadian wire gauge sizes, 
rated 125 percent of the equipment rating, and 
specially marked when specified (1.7.7).  

Class III equipment. 

3.4.2  

Motor control devices are required for cord-
connected equipment with a motor if the motor 
(a) has a nominal voltage rating greater than 
120 V, (b) is rated more than 12 A, or (c) is 
rated more than 1/3hp (locked rotor current 
over 43 A).  

No such motors in the equipment. 

3.4.8  

Vertically-mounted disconnect switches and 
circuit breakers are required to have the “on” 
position indicated by the handle in the up 
position.  

There is no such switch in the 
equipment. 

3.4.10 

For computer room applications, equipment 
with battery systems capable of supplying 750 
VA for five minutes are required to have a 
battery disconnect means that may be 
connected to the computer room remote 
power-off circuit.  

No such battery in the equipment.