Mains Supply Connection; Equipment Grounding; Figure 3.3 Multiload Iii/Rcu Iii Ex Hardware Main Board Power Connector (Tb1) - Toptech MultiLoad III Installation Manual

CHAPTER 3– INSTALLING THE MULTILOAD III/RCUIII EX HARDWARE

Mains Supply Connection

Provide over current protection using a 15 Amp circuit breaker or equivalent. The breaker also serves
as a means of disconnection from the operating supply as required by UL/ISA/IEC 61010-1 and
CAN/CSA-C22.2 NO. 61010-1. The disconnected device may not be blocked or be made difficult to
operate by the MultiLoad III/RCU III EX Hardware or any other device. Note that installation of
disconnects are typically prohibited in Class I, Division 2 locations.
Power required: 100 – 240 Vac, 47 – 63 Hz, 500 mA @ 100Vac/ 250 mA @ 240Vac. The power
connector is in the right hand, bottom corner of the Power Supply/Communication board as shown in
figure 3.3. Select supply wire rated 300V or better with a flammability rating of at least VW-1.
Figure 3.3

Equipment Grounding

A safety ground should be attached to terminal block TB1 to maintain electrical safety in the event of a
fault condition. Follow the terminal block wiring instructions in section 3.6. Keep the required tightening
torque in mind (section 3.5).
The external ground connection is not provided for the attachment of the protective conductor (the
safety ground). Rather, it is provided only as a supplemental bonding connection where local
authorities permit or require such a connection: for example, as a means of equipotentiality. The wire
connection is on the bottom right exterior surface. The following wire sizes may be used: 10 AWG
2
(5.26 mm ) or 11 AWG (4.17 mm
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MultiLoad III/RCU III Hardware - Explosion Proof (EX) Installation Guide
MultiLoad III/RCU III EX Hardware Main Board Power Connector (TB1)
2
).