480 delta to 120/208 Y

[Smart $]

Article 100 definitions BONDED - CONNECTED TO ESTABLISH ELECTRICAL CONTINUITY AND CONDUCTIVITY so the grounded leg of a corner grounded delta must be bonded to case of transformer in a grounded system.

It is or will be through the EGC and MBJ/SBJ.

Bonding is for ground fault current CONTNUITY and CONDUCTIVITY... not normal circuit current. If you bond the grounded conductor at more than one point, you create a parallel path for normal circuit current on the grounding system.

 

[augie47]

Article 100 definitions BONDED - CONNECTED TO ESTABLISH ELECTRICAL CONTINUITY AND CONDUCTIVITY so the grounded leg of a corner grounded delta must be bonded to case of transformer in a grounded system.

While you are browsing thru Art 100:
Grounded Conductor. A system or circuit conductor thatis intentionally grounded.

Grounding Conductor, Equipment (EGC). The conductivepath(s) that provides a ground-fault current path andconnects normally non–current-carrying metal parts ofequipment together and to the system grounded conductoror to the grounding electrode conductor, or both. Informational Note No. 1: It is recognized that the equipmentgrounding conductor also performs bonding.Informational Note No. 2: See 250.118 for a list of acceptableequipment grounding conductors.

and back to an earlier reference:
(5) Load-Side Grounding Connections. A grounded conductorshall not be connected to normally non–currentcarryingmetal parts of equipment, to equipment groundingconductor(s), or be reconnected to ground on the load sideof the service disconnecting means except as otherwise permittedin this article


You are searching for wording that does not exists to uphold your thinking that the grounded conductor can be used for grounding load side equipment and it can not, GroundED conductors are circuit conductors than normally carry currents. . GroundING condcutors only carry currents for fault conditions.

 

[dionysius]

Request

Request

Anyone here care to draw a schematic since the words get somewhat ambiguous........:thumbsup:

 

[winnie]

Article 100 definitions BONDED - CONNECTED TO ESTABLISH ELECTRICAL CONTINUITY AND CONDUCTIVITY so the grounded leg of a corner grounded delta must be bonded to case of transformer in a grounded system.

While strictly true, stating the above without clarification is misleading.

If properly installed, there will be a low impedance metallic path from the 'corner ground' supply terminal of the transformer to the case of the transformer. However this path is very much _not_ direct. This path goes via the grounded circuit conductor to the main bonding jumper way back at the service, and then via whatever egc is used out to the case of the transformer.

The grounded conductor is the conductive material which is intended to carry current which happens to be bonded to ground at the service or supply SDS.

The egc is the conductive material which is _not_ intended to carry current in normal operation, which is connected to the various grounding electrodes and is bonded to the grounded conductor at the service or SDS.

-Jon