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- Page 1 of 9 - 

 

 

Report No.   241619 

 

 

 
 

1.1.2 

GB 4943.1-2011 applies to equipment for 
use at altitudes not exceeding 5000m 
above sea level, primarily in regions with 
moderate or tropical climates. 
Amend the third dashed paragraph of 1.1.2 
as: 

——equipment intended to be used in 

vehicles, on board ships or aircraft, at 
altitudes greater than 5000m; 

Must be considered when 
market to China. 

 

1.4.5 

After the third paragraph, add a paragraph: 
If the equipment is intended for direct 
connection to an AC mains supply, the 
tolerances on RATED VOLTAGE shall be 
taken as +10%,-10% unless a wider 
tolerance is declared by the manufacturer. 
The first dash paragraph"-the RATED 
VOLTAGE is 230V single -phase or 400V 
three-phase, in which case the tolerance 
shall be taken as +10% and -10%" of IEC 
60950-1:2005 is deleted in GB 4943.1-
2011 

Class III equipment. 

N/A 

1.4.12.1 

Tma in clause 1.4.12.1 amended as: Tma: 
is the maximum ambient temperature 
permitted by the manufacturer's 
specification,or 35 °C, whichever is greater. 
 
Add note 1: For equipment not to be 
operated at tropical climatic conditions, 
Tma: is the maximum ambient temperature 
permitted by the manufacturer's 
specification,or 25 °C, whichever is greater. 
Add note 2: For equipment is to be 
operated at 2000m-5000m above sea 
leave, its temperature test conditions and 
temperature limits are under consideration. 

Considered. P 

1.5.2 

Add a note behind the first break off section 
in Clause 1.5.2: A component used shall 
comply with related requirements 
corresponding altitude of 5000m.  

Class III equipment. 

N/A 

1.7 

Add one paragraph before the last 
paragraph: The required marking and 
instruction should be given in normative 
Chinese unless otherwise specified. 

Must be considered when 
market to China. 

 

 

 

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Report No.   241619 

 

 

1.7.1 

Based on the AC mains supply of China,the 
RATED VOLTAGE should be 220V (single 
phase) or 380V (three-phases) for single 
rated voltage, for RATED VOLTAGE 
RANGE, it should cover 220V or 380V 
(three-phases), for multiple RATED 
VOLTAGES, one of them should be 220V 
or 380V (three-phases) and set on 220V or 
380V (three-phases) when manufactured. 
And the RATED FREQUENCY or RATED 
FREQUENCY RANGE should be 50Hz or 
include 50Hz. 

Class III equipment. 

N/A 

 

 

- Page 3 of 9 - 

 

 

Report No.   241619 

 

 

1.7.2.1 Add 

requirements 

of warning for equipment 

intended to be used at altitudes not 
exceeding 2000m or at non-tropical climate 
regions:  
For equipment intended to be used at 
altitude not exceeding 2000m, a warning 
label containing the following or a similar 
appropriate wording, or a symbol as in 
annex DD shall fixed to the equipment at 
readily visible place. 
"Only used at altitude not exceeding 
2000m."        

≤2000m

 

For equipment intended to be used in not-
tropical climate regions, a warning label 
containing the following or a similar 
appropriate wording, or a symbol as in 
annex DD shall fixed to the equipment at 
readily visible place. 
"Only used in not-tropical climate regions." 

 

If only the symbol used, the explanation of 
the symbol shall be contained in the 
instruction manual. 
The above statements shall be given in a 
language acceptable to the regions where 
the apparatus isintended to be used. 
 
If only the symbol used, the explanation of 
the symbol shall be contained in the 
instruction manual. 
The above statements shall be given in a 
language acceptable to the regions where 
the apparatus isintended to be used. 

Must be considered when 
market to China. 

 

2.7.1 

Amended the first paragraph as:  
Protection in PRIMARY CIRCUITS against 
overcurrent short-circuits and earth faults 
shall beprovidedas an integral part of the 
equipment except special provisions. And 
the protective device shall meet the 
requirement of Clause 5.3. 
 Delete note of Clause 2.7.1. 

Class III equipment. 

N/A 

 

 

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Report No.   241619 

 

 

2.9.2  

First section of Clause 2.9.2 amended as 
two sections:  
Where required by 2.9.1, 2.10.8.3, 2.10.10 
or 2.10.11, humidity conditioning is 
conducted for 120 h in a cabinet or room 
containing air with ambient temperature 
40±2℃ and a relative humidity of 
(93±3)%.During this conditioning the 
component or subassembly is not 
energized. 
For equipment not to be operated at 
tropical climatic conditions, Where required 
by 2.9.1, 2.10.8.3, 2.10.10 or 2.10.11, 
humidity conditioning is conducted for48 h 
in a cabinet or room containing air with a 
relative humidity of (93±3)%. 
Thetemperature of the air, at all places 
where samples can be located, is 
maintained within 2 °Cof any convenient 
value between 20 °C and 30 °C such that 
condensation does not occur. 
Due to pretreatment of equipment operated 
at highaltitude area is humidity conditioning 
withstand hot shock, specific requirements 
are to be considered.  
Add note:  For equipment to be operated at 
2000 m - 5000m above sea level, 
assessment and requirement of humidity 
conditioning for Insulation material 
properties are considered. 

Class III 

equipment

.

 N/A