Section 3 — Operation
RTS “W” Type Transfer Switch
NOTE:
Use a torque wrench to tighten the conductors, being sure not to overtighten, or damage to the switch base could occur. If undertightened, a loose connection would result, causing excess heat which could damage the switch base.
Connect power source load conductors to clearly marked transfer mechanism terminal lugs as fol- lows
1.Connect UTILITY (NORMAL) power source cables to switch terminals N1, N2, (N3).
2.Connect EMERGENCY (STANDBY) source power cables to transfer switch terminals E1, E2, (E3).
3.Connect customer LOAD leads to switch termi- nals T1, T2, (T3).
4.Connect neutral conductors of UTILITY, EMERGENCY and customer LOAD to the neutral block.
Conductors must be properly supported, of approved insulative qualities, protected by approved conduit, and of the correct wire gauge size in accordance with applicable codes.
Be sure to maintain proper electrical clearance between live metal parts and grounded metal. Allow at least 1/2 inch for
Auxiliary Contacts are rated 10 amps at 125 or 250 volts AC. DO NOT EXCEED THE RATED VOLTAGE AND CURRENT OF THE CONTACTS.
Figure 2.3 – Auxiliary Contacts
Side views shown in Utility position
2.5CONNECTING START CIRCUIT
WIRES
Control system interconnections consist of UTILITY 1 and 2, and leads 23 and 194. Control system interconnection leads must be run in a conduit that is separate from the AC power lead. Recommended wire gauge sizes for this wiring depends on the length of the wire, as recommended below:
| MAXIMUM WIRE LENGTH | RECOMMENDED WIRE |
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| SIZE |
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| 460 feet (140m) | No. 18 AWG. |
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| 461 to 730 feet (223m) | No. 16 AWG. |
|
| 731 to 1,160 feet (354m) | No. 14 AWG. |
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| 1,161 to 1,850 feet (565m) | No. 12 AWG. |
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2.6AUXILIARY CONTACTS
If desired, there are Auxiliary Contacts on the transfer switch to operate customer accessories, remote advi- sory lights, or remote annunciator devices. A suitable power source must be connected to the COMMON (C) terminal. See Figure 2.3.
Contact operation is shown in the following chart:
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| Switch Position |
| |
|
| Utility | Standby |
|
| Common to Normally Open | Open | Closed |
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| Common to Normally Closed | Closed | Open |
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| 4 |
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3.1FUNCTIONAL TESTS AND
ADJUSTMENTS
Following transfer switch installation and intercon- nection, inspect the entire installation carefully. A competent, qualified electrician should inspect it. The installation should comply strictly with all appli- cable codes, standards, and regulations. When abso- lutely certain the installation is proper and correct, complete a functional test of the system.
Perform functional tests in the exact order pre- sented in this manual, or damage to the switch could be done.
IMPORTANT: Before proceeding with functional tests, read and make sure you understand all instructions and information in this section. Also read the infor- mation and instructions of labels and decals affixed to the switch. Note any options or accessories that might be installed and review their operation.