Help with tap rule

[Ajr188]

Hello,

I have a disconnect located on a roof 35 ft away from the generator, we are tying into spare lugs located on the bus of the generator we are using 350 kcmil for feeders feeding a Ats this was designed on site so we are trying to make sure it’s code compliant

 

[Ajr188]

Length of total wire run to Ats is about 295 ft

 

[Ajr188]

Does the outside tap rule apply here

 

[ActionDave]

Based on your description it is unclear if you actually have a tap.

 

[Ajr188]

The lugs where “ tapped “ at some point prior to my installation. We did not tap them. My disconnnect is exactly 37 feet away after my measurement

 

[augie47]

Does the generator have any overcurrenrt protective device or just output lugs ?

 

[Ajr188]

Just output lugs

 

[augie47]

I have not determined my answer but I agree with post #4 in that, without an OCP device, you don't literally have a tap per definition.

 

[Ajr188]

The disconnect is my over protection device no?

 

[ActionDave]

What is the kW of the generator? You would either be 115 percent of the the generator or have overcurrent at the generator.

 

[mikeames]

Taps are undersized in regards to their primary overcurrent protection. Taps are protected only by design of their secondary protection and calculated load. You have not specified the generator size. You only stated you have 350-kcmil conductors. If this is a 5k generator you don't have taps. What is the size of the generator, ATS, and calculated load? What do you mean the lugs were "Tapped".

 

[Ajr188]

Taps are undersized in regards to their primary overcurrent protection. Taps are protected only by design of their secondary protection and calculated load. You have not specified the generator size. You only stated you have 350-kcmil conductors. If this is a 5k generator you don't have taps. What is the size of the generator, ATS, and calculated load? What do you mean the lugs were "Tapped".

1500 kw generator, 400 amp disconnect and 260 amp Ats

 

[Ajr188]

400 amp disconnect is fused at 250 amps sorry

 

[mikeames]

Does the outside tap rule apply here

Yes

 

[Strathead]

1500 kw generator, 400 amp disconnect and 260 amp Ats

And no overcurrent protection on the generator? Odd!