Residential home Generator

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triplex15

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The cable from the transfer switch to a 25Kw generator is 140' from the transfer switch location. Is the cable required to be in conduit or is SER cable acceptable? It is not a service entrance conductor and it is in a residential home. Thanks
 
When rating the wire it needs to be rated for the total amps of the generator breaker which is 125amps correct? That would require 2/0 AL at 75 degree. The 25KW generator is rated for 100amps with a 125amp breaker inside.
 
Yes size wire for the breaker as it propably allows for peak intermitant start ups. I believer ser is rated in 60 degree so best check. Personally i would try run everything in conduit back to transfer because changing at j box is costly and adds a place for troubles
 
A lot of residential generators call for the wiring to be in conduit. I think this is primarily due to the need to have additional conductors (in addition to the usual 4-wire 120/240 from the generator). These usually include 240 volt utility sensing wires and generator status wires. I've always done mine in conduit and used additional #14 wires for the additional. I even had one with a 240v heater for use in cold locations.

Mark
 
busman said:
A lot of residential generators call for the wiring to be in conduit. I think this is primarily due to the need to have additional conductors (in addition to the usual 4-wire 120/240 from the generator). These usually include 240 volt utility sensing wires and generator status wires. I've always done mine in conduit and used additional #14 wires for the additional. I even had one with a 240v heater for use in cold locations.

Mark
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Yes heaters and also to charge battery. I am one of them residential guys that turned commercial and now want conduit for everything
 
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