Is the number of wires in a 7200 3-phase 3-wire system indicative of the connection used at the substation?

In a 7200 3-phase 3-wire system, the configuration indicates that there are three phases but no neutral wire included in the wiring setup. This type of connection is commonly seen in delta systems, which utilize three wires for the three phases of current. The configuration at the substation typically aligns with this 3-wire system, as substations provide the necessary phase balance and transformation for distribution.

When a system is classified as a 3-phase 3-wire system, it reflects the actual wiring used, which is heavily influenced by the voltage level, phase arrangement, and number of conductors. The connections at the substation must support the type and number of wires required for the load and distribution practices, effectively linking back to the number of wires in use. Thus, in this context, it is accurate to say that the number of wires provides insight into the connection type utilized at the substation and is therefore indicative of that arrangement.

The other possibilities focus on assumptions or conditions that do not directly relate to the basic fact that the number of wires does represent the connections made at that level of the electrical system. The definitive relationship established between the configuration of the system and the substation thus supports the answer given.