NEC3 Option A: How many levels of Subcontracts are acceptable?

NEC3 and NEC4 Contracts General
1

Whilst undertaking works on an Option A Subcontract, how many tier’s of subcontract are required?

For example, the main Contractor issues a subcontract to a supplier for goods and services, then the supplier creates a subcontract for their supplier, then the main contractor requests that the third tier subcontractor creates subcontracts for their suppliers.

Wouldn’t we have a limitation on this, otherwise, this could would go on and on?

2

There is no limitation in the contract on this or, so far as I am aware, in law, so it could go on & on.

Not sure what business the main Contractor has in sticking its oar in at the third tier level for another layer, but it is only a request.