BS EN 50556:2011 pdf download

BS EN 50556:2011 pdf download.Road traffic signal systems.
3.2.5.2
Traffic Non Safety Data
all the remainder of the data which will not cause an unacceptable danger to the road user if the data is changed
3.2.6
Design Authority
Design Responsible
individual or group (organisation) responsible for the safe design and manufacturing, including the instructions for sale use, installation and maintenance of the equipment or system
3.3 Electrotechnlcal
llv• part
see IEC 60050-826
3.3.2
enclosure (EN 50102)
part providing protection of equipment against certain external influences and, in any direction, protection against contact
NOTE This clefirirnon frown the esistmg lniwnalional ElsclroI.clwwcal Vocahetary (IEC 60050-826) needs the toing eicplanalions under the scope of tl etaidad:
a) Endosuree provide protection ot equipment a9ainst harmful effects of meciwilcal impacts and protection of persons and liveitock agairrel cocees to hazaritous pails
b) Barriers shapes of peenrngs ix any other means seiether attached to the endosure ix tanned by the enclosed equlmeflt. suitable to p’eveni ix limit the penetration of the specified lest probes are considered as pail of the enclosure, excw* afrien thisy can be rainored isithoiA the us. of a led
3.3.3
complet. protection
protection that achieves:
a) effective and durable prevention of contact with live parts by the attachment of obstacles at least conforming to type of protection lP2x as defined in EN 60529;
or
b) complete endosure of live parts by insulating material that can be removed only by destruction (protection by insulating envelopment)
3.3.4
partial protection
protection that prevents the possibibty of accidental contact by persons or by objects usually handled by them in one of the following ways:
a) by placing live parts at a distance that the possibility of accidental contact by persons or Objects usuay handled by them is excluded (protection against accidental contact by a safety clearance);
or
b) by attaching obstacles conforming at least to type of protection IPix as defined in EN 60529 (protection against accidental contact by the attachment of obstacles)
3.3.5
reinforced Insulation see EN 60529
3.3.6
nominal voltages
see IEC 60050-826
3.3.7
earthed systems see IEC 60050-826

4.3 Low voltage
4.3.1 Auxiliary state switch response voltage (V)
It is expected that all controllers WI have a point where low input supply voltage wil mean that the rnonitoting systems employed may be unable to operate and therefore would be unable to guarantee the detection or prevention of signal states which endanger traffic. The controller shall be prevented from reaching this limit and should switch to a safe state (see Note), in a controlled manner before this point Is reached.
In a controlled manner means that it shall shut down ii such a way as to prevent any likelihood of a hazardous signal state being displayed during the process of switching to the sale state,
NOTE Th safe slate noted aboite m1i either be d signals off or a flashing Sagiby of her red or yelba or a combination of red and yellow. which w r.cogiised in 11w cowiby m wt’.d the cxinIrir is to be used as a safe state, warning users to pnoo..d carefiiy I ve way to citiers
4.3.2 Power up activation voltage
The system shall become active when the supply voltage reaches a value within its operating voltage range. The restart procedure shall normally be automatic or in exceptional circumstances It may be by manual or remote control. No signalling state dangerous to traffic shall be possable and the sagnalling state shall conform to EN 12675.
4.4 Overvoltage
The system shall be classified as follows according to whether or not a protective device is incorporated which cuts off the supply voltage to prevent damage. Where incorporated, the protective device shall operate when the supply voltage is greater than the operating voltage range.
Class DO: no protective device is required:
4.5 Voltage dip
The system shall be classified according to the duration of clips in supply which affect the operation. In order to avoid undesirable reactions by the signal safeguarding facilities, the system shall operate as shown in Table 1 according to the duration of the voltage dip below V5.
Period t1 is a timepenod of a voltage clip in the supply which will not affect the normal operation of the system. Period t2 Is a timepenod of voltage dip In the supply when the system shall change to signals OFF followed by the start up sequence.