Generator Start Circuits

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NP1776

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Electrician
I have 10 existing Automatic Transfer Switches and adding 4. The 4 I’m adding are Emergency the 10 existing are Standby. These are fed from the same emergency generator. I know the emergency needs to be completely separate. Do the 24v start circuits need to me separate? Again these all originate from the same 24v at the generator. 700.10 (D)(4) does not specify standby and emergency. Everywhere else is referring to branch circuits. These are the start circuits nothing else.
 
If it is a Generac, it may not meet the requirements of an emergency generator. (Not the start circuit, they all parallel together) Some Generac controllers cannot start and transfer the load in under 10 seconds. In fact it may take over 30 seconds. Haven’t had that issue with any of the other brands.
 
This is mainly for code compliance. The Emergency and Standby ATS will both transfer in under 10seconds. These are ASCO units. I’m just wondering if I can share the 24v start circuits for both Emergency and Stanby in the same raceway. Same Generator.
 
NP1776 said:
I have 10 existing Automatic Transfer Switches and adding 4. The 4 I’m adding are Emergency the 10 existing are Standby. These are fed from the same emergency generator. I know the emergency needs to be completely separate. Do the 24v start circuits need to me separate? Again these all originate from the same 24v at the generator. 700.10 (D)(4) does not specify standby and emergency. Everywhere else is referring to branch circuits. These are the start circuits nothing else.
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You raise an interesting question. 700.10 does not seem to address this. I wonder what NFPA 110 says about this. I can see a situation where the non-required to meet 700.10 for the 702 optional system of the control wires taking down the entire system.
Also does your existing genset meet the requirements to supply Art. 700 loads?
 
Yes. This job is separating existing loads to emergency/standby. Fully engineered.
Start circuit system is normally closed held open. Close to start. Start Monitor system will be in place to detect a fault in the system.
 
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