Operating instructions
SPA 1500
Installation instructions
96106-000-IN Installation instructions.doc
Page 8 of 9
10.2 Loudspeaker network when distribution of “GA”
• Loudspeaker network arranged as a closed loop.
• Or with fuses/breakers or electrical protection provided at each deck such that
failure/short circuit in any deck does not affect other decks or the central unit.
• The loudspeaker lines must be a separate network for A and B system with separate
routing. Field junction boxes must also be separate.
10.3 Approved loudspeakers and sound pressure levels
• Loudspeakers to be of 100V line, proven marine design according to IEC60945 and
suitable for the selected positions. Sound pressure level to be minimum as required by
IMO/Solas & class.
• Sound pressure level with ship under way in normal conditions and emergency
announcements (MSC/Circ.808):
o Interior and exterior spaces: 75dbA and at least 20dbA above ambient noise
levels.
o Exterior spaces: 80dbA and at least 15dbA above ambient noise levels.
o In sleeping positions: 75dbA.
10.4 Cable requirements
The 24 VDC power supply cable conductor area is ≥4 mm
2
.
The 110>230 VAC cable conductor area is ≥1.5 mm
2
.
All signal cables must be twisted pairs with outer screen.
All signal cables conductor area is ≥0.75 mm
2
.
Do not combine different systems in the same cable. This to prevent disturbance and noise due
to interference.
10.5 Mounting / Screen termination
SPA 1500 operation unit is mounted in a 19" standard rack or console, and fixed with front
bolts.
For flush mounting: cut-out dimensions are 130 x 445 mm (h x w)
Cable inlet from behind.
SCREEN CONNECTION.
In order to obtain maximum performance after installation, it is important to terminate the cables
and ground the screens in a good manner.
The cables are to be de- isolated by removing the outer insulation. Then the screen braid is cut
off app. 30mm longer than the outer isolation.
The conductor is de-isolated and fitted with end-crimps before they are screwed on to the
terminal.
The outer screen, which now is open, is clamped onto the cable fixing arcs inside the cabinet.
Cable ties of conductive type are recommended for best result.
Please see figure 1 for more details.
SPA 1501 pa control unit is flush mounted in standardized measurement ship consoles.
For other flush mounting: cut-out dimensions are 90 x 123 mm.
Cable inlet from behind.
To ease the cable termination the screw terminals are plug-in type.
Handbook page
23/94