6 安规距离规章说明 REV 05

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文件編號：QLS-MD-I-011 Note：

1. 凡是屬於絕緣強度 B(Basic insulation)或R(Reinforce insulation)時，其空間距離必須確實保持安規規定距離，不可改用其它方法來縮短安全距離。

2. 凡是屬於絕緣強度 Op(Operation)時，其空間距離可小於安規規定距離並改用Short Test 或 Hi-Pot Test來驗証。

3. 若要增加PCB上沿面距離，可在Trace之間加上 ?1mm 挖槽(gap)。 4. 以上安規距離均為施於10NT推力後，應保持的安全距離。

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文件編號：QLS-MD-I-011

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5. Low-Voltage Video Products without Cathode-Ray-Tube Display [UL 1492, CSA C22.2 No1-M1981]

5.1 規則:

5.1.1 UL/CSA並無特殊規定或列表，來區分Clearance和Creepage

5.1.2 若申請CSA時，是同時申請CSA C22.2 No 1-M1981和C22.2 No 234，在計算安全

5.2 安規距離之判定:

5.2.1 UL 之要求:

5.2.2 CSA之要求:

ｄ： 表示安規距離 Ｕ： 表示Vpeak

公式: d=10[ 0. 6 7 8 x l o g ( U / 1 3 0)]

在保險絲之前的Line, Neutral及FG端子之空間距離≧3.2mm。

距離時，必須將上一節及本節規定的安全距離一併列入考慮，並選擇最大值為其安全距離。

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Definitions

1.2.8 Circuit characteristics

1.2.8.1 PRIMARY CIRCUIT: An internal circuit which is directly connected to the external

supply mains or other equivalent source (such as a motor-generator set) which supplies the electric power. It includes the primary windings of transformers, motors, other loading devices and the means of connection to the supply mains.

1.2.8.2 SECONDARY CIRCUIT: A circuit which has no direct connection to primary power

and derives its power from a transformer, converter or equivalent isolation device situated within the equipment.

1.2.8.3 HAZARDOUS VOLTAGE: A voltage exceeding 42.4 V peak, or 60 V d.c., existing in a

circuit which does not meet the requirements for either: - a LIMITED CURRENT CIRCUIT; or

- a TNV CIRCUIT that is in compliance with the requirements of 6.2.1 and 6.2.2.

1.2.8.3 effective March 15, 2000

1.2.8.4 EXTRA-LOW VOLTAGE (ELV) CIRCUIT: A SECONDARY CIRCUIT with

voltages between conductors, and between any conductor and earth, not exceeding 42.4 V peak, or 60 V d.c., under normal operating conditions, which is separated from

HAZARDOUS VOLTAGE by at least BASIC INSULATION, and which meets neither all of the requirements for an SELV CIRCUIT nor all of the requirements for a LIMITED CURRENT CIRCUIT.

1.2.8.5 SAFETY EXTRA-LOW VOLTAGE (SELV) CIRCUIT: A SECONDARY CIRCUIT

which is so designed and protected that under normal and single fault conditions, the

voltage between any two accessible parts and, for CLASS I EQUIPMENT, between any

accessible part and the equipment protective earthing terminal does not exceed a safe value.

NOTES 1

Under normal conditions this limit is either 42.4 V peak, or 60 V d.c. Under fault conditions higher

limits are specified in this standard for transient deviation. 2

This definition of an SELV CIRCUIT differs from the term SELV as used in IEC 364.

1.2.9

Insulation

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1.2.9.1 OPERATIONAL INSULATION: Insulation needed for the correct operation of the

equipment.

NOTE - OPERATIONAL INSULATION by definition does not protect against electric shock. It may, however, serve to minimize exposure to ignition and fire.

1.2.9.2 BASIC INSULATION: Insulation to provide basic protection against electric shock.

1.2.9.3 SUPPLEMENTARY INSULATION: Independent insulation applied in addition to

BASIC INSULATION in order to reduce the risk of electric shock in the event of a failure of the BASIC INSULATION.

1.2.9.4 DOUBLE INSULATION: Insulation comprising both BASIC INSULATION and

SUPPLEMENTARY INSULATION.

1.2.9.5 REINFORCED INSULATION: A single insulation system which provides a degree of

protection against electric shock equivalent to DOUBLE INSULATION under the conditions specified in this standard.

NOTE - The term \ It may comprise several layers which cannot be tested as SUPPLEMENTARY or BASIC INSULATION.

1.2.9.6 WORKING VOLTAGE: The highest voltage to which the insulation under consideration

is, or can be, subjected when the equipment is operating at its RATED VOLTAGE under conditions of normal use.

NOTE - See 2.2.7. 3

Creepage distances and clearances

1.2.9.3 CREEPAGE DISTANCE: The shortest path between two conductive parts, or between a

conductive part and the BOUNDING SURFACE of the equipment, measured along the surface of the insulation.

1.2.10.2 CLEARANCE: The shortest distance between two conductive parts, or between a

conductive part and the BOUNDING SURFACE of the equipment, measured through air.

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