Recommended Wire Sizes And Torque For All Terminal Blocks; Electrical Supply Connections - Toptech MultiLoad II DIV-2 Installation Manual

3.5

Recommended Wire Sizes and Torque for All Terminal Blocks

Three sizes of terminal blocks are used in the MultiLoad II/ RCU II products: 7.62 mm pitch (supply
power), 5.08 mm pitch (line voltage switching), and 3.81 mm pitch (serial communication, analog or dc
voltages). The 7.62 and 5.08 mm terminal blocks have an allowable wire size of 24 AWG – 12 AWG
and should be tightened to 0.55 Nm +/-0.05 Nm (5 lb in +/- 0.4 lb in).
The 3.81 mm terminal blocks have an allowable wire size of 28 AWG – 16 AWG and should be
tightened to 0.23 Nm +/-0.02 Nm (2 lb in +/- 0.2 lb in).
3.6

Electrical Supply Connections

The MultiLoad II/ RCU II may be equipped for either 85 -250Vac or 24Vdc operation. Verify the
power type before making any connections.
Fiel Wiring must be rated 75°C or greater.
WARNING: If there are unused holes, blanking elements appropriate for the type enclosure
must be used.
Do not route AC and DC wiring in the same conduit.
All wiring must enter the MultiLoad II/ RCU II enclosure through conduit via entries in the bottom of the
enclosure. All conduits must be terminated at the enclosure by use of appropriately-rated conduit hubs
or glands.
Wires must be stripped ¼" and fully inserted into terminal block with no bare conductor exposed.
Review section 3.5 for recommended wire size and torque values.
Both ac and dc input models require a safety ground connection as described in section 3.6.3 below.
A service loop is recommended for all wires and cables entering the enclosure.
Do not allow service loop cables to overlap the circuit boards. Coil any cable length in the
bottom of the enclosure. Keep AC wiring separated from all other wiring in the enclosure by use
of the supplied partitions (see wire partition instructions below).
Wiring must comply with all local electrical codes.
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