ELECTRICAL BOND BETWEEN PRIMARY AND SECONDARY NEUTRAL PURPOSE

[ISMAEL VEGA]

Hi:

I'm wondering what's the purpose of making a "jumper" or bonding connection between the secondary neutral and the primary neutral. I know utilities ask to run a neutral wire in an underground feeder that will feed a delta-wye grounded transformer connection. I can imagine that it is to bond the secondary neutral to the system neutral (primary is connected in delta and don't need it). What's the purpose of this bonding connection?

I appreciate your help!!

Ismael

 

[Smart $]

The simplest answer is utilities run a neutral for grounding.

 

[mbrooke]

Hi:

I'm wondering what's the purpose of making a "jumper" or bonding connection between the secondary neutral and the primary neutral. I know utilities ask to run a neutral wire in an underground feeder that will feed a delta-wye grounded transformer connection. I can imagine that it is to bond the secondary neutral to the system neutral (primary is connected in delta and don't need it). What's the purpose of this bonding connection?

I appreciate your help!!

Ismael

It allows the POCO to gain access to a free second neutral and a free grounding system.

Customers often have municipal metal water pipes running across town which act as a conductor itself (second neutral).

In addition to that a customer's ground electrodes, UFER ect give extra lightning protection to POCOs equipment.