Power Supply Cables (Ip) - Tunstall FlamencoIP Technical Manual

8. Laying the cables
8.4

Power supply cables (Ip)

Electric power for the nurse call system is provided with +24 V DC, which is gener-
ated 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 sup-
ply 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. Cou-
pling of power supply units in parallel is not allowed.
The power supply ring circuit should be made using cables of 2.5 mm² cross section.
Depending on the type of circuit, single core leads (NYA 2.5 mm² for +24V and 0V)
or a common cable (NYM 2x2.5 mm²) may be used.
+24 V
0 V
Fig. 9: NYM 2x2,5 mm
NOTE! When laying the cables, always select the shortest route to keep the result-
ant voltage drop as low as possible.
Use of logic colour codes for the cables and/or specific laying techniques for the ex-
tra-low voltage cables shall eliminate the chance for mix-up with cables of the low-
voltage system. If you select to use cable material which is also used for low-voltage
systems you should mark and designate these cables clearly and permanently.
Comply with current rules and directives!
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Flamenco
IP
- Technical Manual - 00 8813 52, 03/18 (Rev. 1.0)