Backup generator installation

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Wrabbitslayer

Member
Location
Arkansas
Occupation
Industrial Electrician
Hello, I am an industrial electrician. Most of my experience has been with existing installations but I have ran services for new equipment also. I have been approached by the local volunteer fire department asking me to hook up a backup generator they received from the USFS. The generator is a 60 Kw 3PH military surplus, see attached data plate. This is outside the scope of what I usually do so I'm needing some advise. The fire department has a 200A panel inside with the 2 largest loads being an electric range and the compressor they use for filling their SCBA tanks.
I intend to go from the Gen to a transformer then inside the building to a manual transfer switch. I am at a complete loss what type and size transformer I need. Also, What would be an appropriate transfer switch. They have a very limited budget so are wanting it done as cheaply as possible. Any help y'all can give me would be greatly appreciated.

https://postimg.cc/gallery/FmK44df
 
The nameplate shows a possible output of 120/208 so you should not need a transformer.
Is there a service disconnect ahead of the existing panel or is it a service panel ?
 
augie47 said:
The nameplate shows a possible output of 120/208 so you should not need a transformer.
Is there a service disconnect ahead of the existing panel or is it a service panel ?
Click to expand...
I finally found the tech manual for this gen set. You are right, it does say that it can be used for single phase applications.

When using single phase connections, balance loads between terminals. Do
not connect all loads between one terminal and L0. Failure to observe this
caution can result in damage to equipment.
b. Select required output terminals from Table 2-6.
TABLE 2-6. LOAD TERMINAL AND AC RECONNECTION BOARD SELECTION
RECONNECTION
BOARD
POSITION
TERMINALS VOLTAGE READING
120/208 L1, L2, L3, N
3 Phase
(Single phase loads can be served
using any terminal to N)
L1-N 120 volts
L2-N 120 volts
L3-N120 volts
L1-L2 208 volts
L2-L3 208 volts
L3-L1 208 volts
240/416 L1, L2, L3, N
3 Phase
(Single phase loads can be served
using any terminal to N)
L1-N 240 volts
L2-N 240 volts
L3-N 240 volts
L1-L2 416 volts
L2-L3 416 volts
L3-L1 416 volts

So that answers the transformer question. There is not a disconnect in line, it is a service panel. I an still unsure about what transfer switch I need.
 
Wrabbitslayer said:
I finally found the tech manual for this gen set. You are right, it does say that it can be used for single phase applications.

When using single phase connections, balance loads between terminals. Do
not connect all loads between one terminal and L0. Failure to observe this
caution can result in damage to equipment.
b. Select required output terminals from Table 2-6.
TABLE 2-6. LOAD TERMINAL AND AC RECONNECTION BOARD SELECTION
RECONNECTION
BOARD
POSITION
TERMINALS VOLTAGE READING
120/208 L1, L2, L3, N
3 Phase
(Single phase loads can be served
using any terminal to N)
L1-N 120 volts
L2-N 120 volts
L3-N120 volts
L1-L2 208 volts
L2-L3 208 volts
L3-L1 208 volts
240/416 L1, L2, L3, N
3 Phase
(Single phase loads can be served
using any terminal to N)
L1-N 240 volts
L2-N 240 volts
L3-N 240 volts
L1-L2 416 volts
L2-L3 416 volts
L3-L1 416 volts

So that answers the transformer question. There is not a disconnect in line, it is a service panel. I an still unsure about what transfer switch I need.
Click to expand...
Can use

Generac RXSW200A3​

Fed from L1-N on 240/416 from generator to feed single phase 200A load.
 
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