Metropolitan Magistrate Vikram extended the police custody of Manoj Jain, who was produced before the court on expiry of his five-day remand, till January 31.
The other accused and co-owner of the firecracker unit, Lalit Goyal, would also be produced before the court on the same day.
Jain was arrested on January 21, while Goyal was arrested on January 27 and sent to four days police custody.
It further submitted that a detailed investigation could not be conducted due to shortage of staff as the force was busy in arrangements of Republic Day parade.
The court, while allowing the police's plea, directed it to conduct the accused's medical examination every 24 hours till he was in custody.
Meanwhile, advocate Rishipal Singh, representing few victims of the tragedy, moved an application seeking an independent probe into the matter by agencies like the National Investigation Agency (NIA), Central Bureau of Investigation (CBI) or the Anti-Terrorism Squad (ATS).
"Till date, no investigation has been carried out despite the lapse of more than 8 days from the date of registration of FIR," the plea said.
It alleged that statements of the victims have also not been recorded so far.
A fire had broken out in the storage unit on the ground floor of the two-storey building in Bawana on January 20 and ripped through the structure. Of the 17 killed, 10 were women. A man and woman were injured in the incident.
It was earlier informed that both the accused were running the factory without any licence and the explosive materials were procured from outside Delhi.
The probe agency had claimed that the explosive materials were brought to the city without any permission or checking, and sought the custody of the accused to verify whether he was running any other such illegal enterprises.
An FIR was registered under various provisions of the IPC relating to culpable homicide not amounting to murder and negligent conduct with respect to fire or combustible material.
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