Flamenco Technical Manual Revision 6.0 - Tunstall.de

8. Laying the cables
8.3 Electric power supply cables (Ip)
Electric power for the system is provided with +24 V DC, which is generated by
regulated, short-circuit proof power supply units.
The power supply cable Ip is installed as a ring circuit. Cable lengths should be
kept as short as possible to preclude larger voltage drops.
Maximum voltage differential from the power supply unit to the farthest room
being supplied via the ring circuit should not exceed 4 V.
Where larger voltage drops are observed, another cable should be laid from the
supply unit, or a cross linking within the +24 V ring circuit should be realised.
If neither solution will solve the problem, a second power supply unit should be
installed. Coupling of power supply units in parallel is not allowed.
The power supply ring circuit should be made using cables of 2.5 mm 2 cross
section. Depending on the type of circuit, single core leads (NYA 2.5 mm 2 for
+24V and 0V) or a common cable (NYM 2x2.5 mm 2 ) may be used.
Fig. 4: NYM 2x2,5 mm 2
NOTE ! When laying the cables, always select the shortest route to keep the
resultant voltage drop as low as possible.
Use of logic colour codes for the cables and/or specific laying techniques for
the extra-low voltage cables shall eliminate the chance for mix-up with highvoltage
cables. If you select to use cable material which is also used for high
voltage circuits you should mark and designate these cables clearly and permanently.
Comply with current rules and directives!
Flamenco - Technical Manual, 04/13 (Rev. 6.0), 00 8812 60
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