S4000C
11
Figure 9: Relay Protection for DC and AC Loads
European Union (EU) Approved Applications:
The ALARM relay contact ratings are 8A, 30 V
RMS/42.4 V peak or 8A @ 30 VDC resistive max.
North American Approved Applications:
The ALARM relay contact ratings are 8A @ 250 VAC
and 8A @ 30 VDC resistive max.
3.5.6 European
Union
(EU) Approved Applications
Interconnecting cables must have an overall screen or screen and armor. Cables BS5308 Part
2, Type 2, or equivalent are suitable. Note that the terms ‘screen’ and ‘shield’ are equivalent for
the purpose of this manual. The cable armor must be terminated in a suitable cable gland, at
the detector, to ensure a positive electrical connection.
3.5.7 Cable
Termination
in the Non-Hazardous Area
•
The cable
armor
must be connected to
safety earth
in the safe area.
•
The cable
screen
(drain wire) must be connected to an
instrument earth
in the safe area.
•
The power supply
OV return
must be connected to an
instrument earth
in the safe area.
•
The interconnecting cables should be segregated from power and other noisy cables.
Avoid proximity to cables associated with radio transmitters, welders, switch mode power
supplies, inverters, battery chargers, ignition systems, generators, switch gear, arc lights
and other high frequency or high power switching process equipment. In general, maintain
separation of at least 1 meter between instrument and other cables. Greater separations
are required where long parallel cable runs are unavoidable. Avoid running instrument
cable trenches close to
lightning conductor earthing pits.
•
Complete all cable insulation testing before connecting the cable at either end.
WARNING:
Under
NO
circumstances should equipment be connected or disconnected when
under power. This is contrary to hazardous area regulations and may lead to
serious damage to the equipment. Equipment damaged in this manner is not
covered under warranty.