Kohler 20--2800 kW manual Electrical Connections, Load Lead Connections

7.2 Electrical Connections

Several electrical connections must be made between the generator set and other components of the system for proper operation. Because of the large number of accessories and possible combinations, this manual does not address specific applications. Refer to the submittal catalog accessory drawings and wiring diagrams for connection and location. Most field-installed accessory kits include installation instructions.

For customer-supplied wiring, select the wire temperature rating in Figure 7-2 based upon the following criteria:

DSelect row 1, 2, 3, or 4 if the circuit rating is 110 amperes or less or requires #1 AWG (42.4 mm2) or smaller conductors.

DSelect row 3 or 4 if the circuit rating is greater than 110 amperes or requires #1 AWG (42.4 mm2) or larger conductors.

Comply with applicable national and local codes when installing a wiring system.

Row	Temp. Rating		Copper (Cu) Only	Cu/Aluminum (Al) Combinations	Al Only
1	60_C (140_F)		Use No. * AWG, 60_C	Use 60_C wire, either No. * AWG Cu, or	Use 60_C wire, No. *
		or	wire or use No. * AWG,	No. * AWG Al or use 75_C wire, either	AWG or use 75_C wire,
	75_C (167_F)		75_C wire	No. * AWG Cu or No. * AWG Al	No. * AWG
2	60_C	(140_F)	Use No. * AWG, 60_C	Use 60_C wire, either No. * AWG Cu or	Use 60_C wire, No. *
			wire	No. * AWG Al	AWG
3	75_C	(167_F)	Use No. *[ AWG, 75_C	Use 75_C wire, either No. *[ AWG Cu or	Use 75_C wire, No.*[
			wire	No. *[ AWG Al	AWG
4	90_C	(194_F)	Use No. *[ AWG, 90_C	Use 90_C wire, either No. *[ AWG Cu or	Use 90_C wire, No.*[
			wire	No. *[ AWG Al	AWG

* The wire size for 60_C (140_F) wire is not required to be included in the marking. If included, the wire size is based on ampacities for the wire given in Table 310-16 of the National Electrical Coder, in ANSI/NFPA 70, and on 115% of the maximum current that the circuit carries under rated conditions. The National Electrical Coder is a registered trademark of the National Fire Protection Association, Inc.

[ Use the larger of the following conductors: the same size conductor as that used for the temperature test or one selected using the guidelines in the preceding footnote.

Figure 7-2 Terminal Markings for Various Temperature Ratings and Conductors

7.3 Load Lead Connections

Load leads being brought into the generator can enter in a number of different areas. On generators 300 kW and below the most commonly used is the bottom entry, where conduit is “stubbed up” into the junction box from below. Other methods include flexible conduit roughed into the sides or top of the junction box. When using this method, be sure not to block the front or rear of the controller, as doing so will prevent access to it for service purposes. See Figure 7-3.

On generators larger than 300 kW, a junction box is mounted on the rear of the generator. Larger sets may have oversize junction boxes supplied as an option or to accommodate buss bar connections. Consult the dimensional drawing on your unit for detailed information.

	1
	2
	TP-5700-7
1.	Conduit from ceiling
2.	Conduit stubbed up from below

Figure 7-3 Typical Load Lead Connection

36 Section 7 Electrical Requirements TP-5700 7/93