Kohler Generator Sets 20--2800 kW - Manual (Page 48)

TP-5700 7/93 36 Section 7 Electrical Requirements
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:
D Select row 1, 2, 3, or 4 if the circuit rating is
110 amperes or less or requires #1 AWG (42.4 mm 2 )
or smaller conductors.
D Select row 3 or 4 if the circuit rating is greater than
110 amperes or requires #1 AWG (42.4 mm 2 ) 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)
or
75
_C (167_F)
Use No. * AWG, 60
_C
wire or use No. * AWG,
75
_C wire
Use 60
_C wire, either No. * AWG Cu, or
No. * AWG Al or use 75 _C wire, either
No. * AWG Cu or No. * AWG Al
Use 60
_C wire, No. *
AWG or use 75 _C wire,
No. * AWG
2 60 _C (140_F) Use No. * AWG, 60 _C
wire
Use 60 _C wire, either No. * AWG Cu or
No. * AWG Al
Use 60 _C wire, No. *
AWG
3 75 _C (167_F) Use No. * [ AWG, 75_C
wire
Use 75 _C wire, either No. *[ AWG Cu or
No. * [ AWG Al
Use 75 _C wire, No.*[
AWG
4 90 _C (194_F) Use No. * [ AWG, 90_C
wire
Use 90 _C wire, either No. *[ AWG Cu or
No. * [ AWG Al
Use 90 _C wire, No.*[
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 Code r, in ANSI/NFPA 70, and on 115% of the maximum current that the circuit carries under
rated conditions. The National Electrical Code r 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.
TP-5700-7
1
2
1. Conduit from ceiling
2. Conduit stubbed up from below
Figure 7-3 Typical Load Lead Connection