Model S4000T
12
Figure 23 Relay Protection for DC and AC Loads
North American Approved Applications - The ALARM relay contact ratings are 8A @
250 VAC and 8A @ 30 VDC resistive max.
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.
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.
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