18
6000 Series Purge/Pressurization System
I/O Manual
Electrical diagrams
General wiring notes for component kit design
For power connections to the control unit and relay
contacts:
1. All applicable local and national wiring codes
MUST be followed when wiring to the unit.
2. Protective earth wire to be 14 AWG (2.08 mm
2
).
Strip length of earth to mate with pigtail under
wire nut .437" to .5" (11.1mm to 12.7 mm).
3. If a single wire is used, the maximum wire gauge
to the pluggable terminal block is 14 AWG
(2.08mm
2
).
4. If jumpering from one terminal to another at
pluggable terminal block, the maximum wire
gauge is 16 AWG (1.31 mm
2
) for both wires.
5. Minimum wire gauge to the pluggable terminal
block is 24 AWG (0.20 mm
2
). (Based on
connector, not code. Follow all applicable codes.)
6. Strip length of wires terminating into the screw
terminals on the pluggable terminal block to be
0.2" to 0.27" (5 mm to 7 mm).
7. Add extra wire length of 1.25" (31.75 mm) past
top of opening in explosion-proof/ameproof box
to pluggable terminal block. (Allows connector
to be moved out of the way when changing
electronics. Prevents repouring seals.)
8. Wires are to be neatly tucked back down past the
lid threads before lid is placed on unit. The wires
must not loop past the high point of the plastic
cover. The wire nut should be tucked in last (if
not, it may be difficult to access when changing
electronics).
9. If using a single conduit seal, the other conduit
on the 6000 control unit will need a cap for
the end of the conduit with appropriate hazloc
certications. (A standard 3/4" conduit cap will
not work.)
10. Conduit seals or the 6000-CC-3/4NPT plug must
be within 18" (457.2 mm) of internal explosion-
proof/ameproof box, or within 15.25" (387.3 mm)
from the end of the conduit supplied with the
6000 unit.
11. When wiring to the terminal plug, it is easier
to remove the plug, terminate the wires, then
reconnect the plug.
12. When removing the pluggable terminal block, it
is recommended that the electronics module be
supported by pressing down on top of the EPCU
to counteract the lifting force required to remove
the connector.
13. Wire should be copper only, rated 90 °C
minimum.
14. The minimum wire strand in a stranded wire
should have a diameter of 0.1 mm or greater.
15. The 6000-CC-3/4NPT plug is certied to be
used only with the 6000 control unit’s ¾” nipples
coming out of the housing. This plug is not
certied to be used on any other hazardous
location equipment.
16. Ensure that electrical, mechanical, and
pneumatic connections and requirements are
met to operate this system. Please refer to
this manual and applicable standards/codes,
including current editio9n of the EN/IEC 60079-
14. Electrical supply to the purge system shall be
supplied through a switch or circuit breaker and
suitably located and easily reached and must be
marked as the disconnect for the equipment.
1 7. Power must be removed from the system when
the Ex d enclosure cover is off, unless the area is
known to be non-hazardous.
I.S. wiring notes
For wires going to the explosion-proof/ameproof
box on the I.S. side:
1. The wire strip length is to be between 0.2" and
0.27" (5 mm and 7 mm).
2. The wire's gauge depends on the number of
connections. Fewer wires allow for heavier
gauge and will still meet the conduit seal ll
requirement. See the applicable standards for ll
requirement.
3. The terminal blocks are rated for a wire size of
16 AWG (1.31 mm
2
) to 28 AWG (0.08 mm
2
).
4. If multiple wires need to land to a single terminal
(e.g., the RS-485 bus) these wires must be
either crimped to a single pin or grouped in an
external junction box with one wire going in to
the terminal.
5. The wires must have a minimum insulation
thickness of 0.01" (0.25 mm).
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