1、June 2013 Translation by DIN-Sprachendienst.English price group 16No part of this translation may be reproduced without prior permission ofDIN Deutsches Institut fr Normung e. V., Berlin. Beuth Verlag GmbH, 10772 Berlin, Germany,has the exclusive right of sale for German Standards (DIN-Normen).ICS 7
2、5.200!% 1 M 5.6.2 Voltage test Insulation, no failure at 1 000 Uac = 1 000V 5.6.3 Functional Test Functional correctly according manufacturers specification 5.6.4 Resistance of nozzle to earth The resistance shall be 50 mm from the dispenser wall. If the wall is IP67 within 200 mm horizontally and 5
3、0 mm vertically upwards and downwards to ground level from the nozzle outlet then the area on the other side of the IP67 barrier is not classified due to the nozzle. See Figure A.1 and Figure A.2. Dimensions in millimetres Key 1 nozzle 2 non hazardous area Z1 zone 1 category 2 equipment Z2 zone 2 ca
4、tegory 3 equipment Figure A.1 Nozzle outside and below a housing at distance 50 mm and 200 mm DIN EN 14678-1:2013-06 EN 14678-1:2013 (E) 24 Figure A.2 shows the situation where the nozzle extends above the top of the housing and the extent of the IP54 wall. Dimensions in millimetres Key 1 nozzle 2 n
5、on hazardous area Z1 zone 1 category 2 equipment Z2 zone 2 category 3 equipment Figure A.2 Nozzle outside and above a housing at distance 50 mm and 200 mm DIN EN 14678-1:2013-06 EN 14678-1:2013 (E) 25 Nozzle outside the housing but positioned 50 mm from a barrier. If the wall is IP67 within 200 mm h
6、orizontally and 50 mm vertically upwards and downwards to ground level from the nozzle outlet then the area on the other side of the IP67 barrier is not classified due to the nozzle. See Figure A.3. Dimensions in millimetres Key 1 nozzle 2 non hazardous area Z1 zone 1 category 2 equipment Z2 zone 2
7、category 3 equipment Figure A.3 Nozzle outside a housing at distance 50 mm DIN EN 14678-1:2013-06 EN 14678-1:2013 (E) 26 A.3 Nozzle boot area Nozzle outside the housing but positioned 200 mm from any side non hazardous zone. The nozzle boot is set on one of the fascias of the non hazardous enclosure
8、. See Figure A.4, Figure A.5 and Figure A.6. Dimensions in millimetres Key 1 nozzle boot Z 1 zone 1 category 2 equipment Z 2 zone 2 category 3 equipment Figure A.4 Nozzle boot area front view DIN EN 14678-1:2013-06 EN 14678-1:2013 (E) 27 Dimensions in millimetres Key 2 non hazardous area 3 continuou
9、s fabrication Z 1 zone 1 category 2 equipment Z 2 zone 2 category 3 equipment Figure A.5 Nozzle boot area side view Dimensions in millimetres Key 2 non hazardous area 3 continuous Z 1 zone 1 category 2 equipment Z 2 zone 2 category 3 equipment Figure A.6 Nozzle boot area top view DIN EN 14678-1:2013
10、-06 EN 14678-1:2013 (E) 28 Annex B (normative) Vapour barriers B.1 Classification B.1.1 General Within this annex, all references to IP54 shall be taken as references to IP54 Category 2 of EN 60529. In Figure B.1, Figure B.2, Figure B.3, Figure B.4, Figure B.5 and Figure B.6, the IP ratings shown ar
11、e those necessary for limiting the extent of hazardous areas. B.1.2 Vapour barrier - Type 1 A vapour barrier shall be classified as Type 1, if it consists of one wall with a protection level IP67 in accordance with EN 60529 (see Figure B.1 and Figure B.2). B.1.3 Vapour barrier - Type 2 A vapour barr
12、ier shall be classified as Type 2, if it consists of two walls, each with protection to IP54 in accordance with EN 60529 and with an air gap greater than 20 mm (see Figure B.3, Figure B.4, Figure B.5 and Figure B.6). B.1.4 Air gaps Air gaps shall be designed so that no vapour is trapped. Where the a
13、ir flow through the air gap is restricted by cables, screens or other objects, the effective width of the air gap shall be greater than 20 mm. Where there are obstructions to the air gap, the effective minimum cross ventilation section shall be at least (L x 20) mm. For defining the actual gap d (in
14、 mm) in case of obstructions, the following equation shall be used: FAsLLd= 20 where d is the defining gap in mm s is the mean total width of the obstruction (cables, studs, etc.) seen in the cross ventilation section L is the longest length of the vapour barrier over the cross ventilation section A
15、Fis the screen factor, which is the total surface of the screen covering one face of the space divided by total area of the holes in the same face of the screen B.1.5 Screens Where a screen is used the diameter of screen holes or width of screen apertures shall be at least 5 mm. See Figure B.3, Figure B.4, Figure B.5 and Figure B.6. DIN EN 14678-1:2013-06
