Paragraph 46 I1

England, Wales and Scotland

(1)

Equipment used in connection with the signals (including the content of all instructions stored in, or executable by, that equipment) may only be placed if, at the time it is first placed, it complies with the requirements of BS EN 12675:2001^f1 and BS EN 50556:2011^f2.

(2)

Sub-paragraphs (3) to (7) make provision about how the Standards are to apply.

(3)

In relation to the requirements of BS EN 12675:2001, if the state specified in column 2 of an item in table 1 occurs, the class of response that applies is that set out in column 3.

(4)

In relation to the requirements of BS EN 50556:2011, the class of response for an aspect of performance at an item in table 2 in column 3 (within a subject area in column 2) is that in column 4.

(5)

The signal states which endanger traffic for the purposes of 5.2.3 of BS EN 50556:2011 are those specified in column 2 of table 1 at item 1, 2, 4 or 16.

(6)

Upon a state described in sub-paragraph (5) occurring, all signal heads and push button units must switch off in accordance with the classes of response specified in column 4 of table 2 at items 6 and 7.

Table 1:

Requirements of BS EN 12675:2001

(1) Item	(2) State	(3) Class
1	Green-green conflict	AA1
2	Green-yellow conflict	AB1
3	Yellow-yellow conflict	AC0
4	Green-red/yellow conflict	AD1
5	Green-green/yellow conflict	AE0
6	Absence of any conflicting red signal	AF0
7	Absence for conflicting red on specified signal heads	AG0
8	Absence of the last conflicting red signal	AH0
9	Absent red/absent red	AJ0
10	National signal regulations (infringement)	BA0
11	Absence of a red signal on a specified signal group	CA1
12	Absence of the last red signal	CB1
13	Absence of a number of red signals	CC1
14	Absence of specified red signals	CD0
15	Absent signal groups, yellow or green signals	CE0
16	Compliance checking	DA1
17	Stored values of timings	FA1
18	Time base frequency	FB0
19	Minimum values of time settings	FC0
20	Maximum values of time settings	FD0
21	Duration of timings	FE0
22	National signal sequences (infringement)	GA0
23	Specified signal group green to signal group green movements	GB0
24	Specified signal start-up sequence signal group movements	GC0
25	Failure of external inputs	HA1

Table 2:

Requirements of BS EN 50556:2011

(1) Item	(2) Subject area	(3) Aspect of performance	(4) Class
1	Electrical supply	Overvoltage	D0
2	Safety	Leakage current	T2
3		Enclosure	V2
4		Terminations	H0
5		Requirements of signalling intensity for safety	AF5
6		Requirements for signal states (i)	AG5
7		Requirements for signal states (ii)	X1
8		Location of monitoring elements for signals	N0
9	Test of impedance	Fault loop impedance test	AA1
10	Maintenance	Maintenance testing procedures	Y1
11	Environmental	Dry heat	AB3
12		Cold	AE2
13		Damp heat, cyclic	AK2
14		Solar radiation	AH0
15		Random vibration (operational)	AL2
16		Random vibration (transportation)	AM2

Paragraph 46 I1

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