Supply side terminology

P

Pinnie

Humble Disciple
Location
Ohio
Occupation
Commercial Electrician
Dumb question but is supply side synonymous with line side?

I need to add characters to this question.
 
infinity said:
I think it has more to do with being ahead of the OCPD like in a SSBJ (supply side bonding jumper).
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what other examples come to mind? I wish it was defined. It not being defined means it would have the same definition as in a regular dictionary right?
 
This might get you close but it's certainly not comprehensive as far as definitions go.

Bonding Jumper, Supply-Side.
A conductor installed on the supply side of a service or within a service equipment enclosure(s), or for a separately derived system, that ensures the required electrical conductivity between metal parts required to be electrically connected.
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Pinnie said:
what other examples come to mind? I wish it was defined. It not being defined means it would have the same definition as in a regular dictionary right?
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I think it is a commonly understood term and does not need to be in Article 100. I also doubt you would find a reasonable definition in Webster’s Collegiate Dictionary, 11th edition, the specified dictionary in the NEC Style Manual.
 
don_resqcapt19 said:
I think it is a commonly understood term and does not need to be in Article 100. I also doubt you would find a reasonable definition in Webster’s Collegiate Dictionary, 11th edition, the specified dictionary in the NEC Style Manual.
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Would you consider it synonymous with upstream?
 
Like if I said, upstream of the service disconnect, would that be the same as supply side of the service disconnect?
 
Pinnie said:
Like if I said, upstream of the service disconnect, would that be the same as supply side of the service disconnect?
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Upstream of the disco is the same as the supply side of the disco.

Upstream in general only means towards the supply side of a given point.
 
don_resqcapt19 said:
It is on the supply side of the OCPD.
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Which is why a SSBJ is typically larger than the EGC on the load side of the OCPD. For example the SSBJ for a 400 amp OCPD on the secondary of a transformer i3th 600 kcmil conductors would be a minimum of #1/0. The EGC on the load side of the same 400 amp OCPD would only need to be a minimum of #3.
 
infinity said:
Which is why a SSBJ is typically larger than the EGC on the load side of the OCPD. For example the SSBJ for a 400 amp OCPD on the secondary of a transformer i3th 600 kcmil conductors would be a minimum of #1/0. The EGC on the load side of the same 400 amp OCPD would only need to be a minimum of #3.
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Another question. How does the first ocpd after a transformer protect its supply conductors. Wouldn’t it just protect the conductors downstream of itself?
 
Pinnie said:
Another question. How does the first ocpd after a transformer protect its supply conductors. Wouldn’t it just protect the conductors downstream of itself?
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Same way a main breaker effectively protects its supply conductors, similar to allowances for tap rules.
 
Supply side, load side are meaningless without a reference point.

Any item, switch, breaker, contactor, fuse, even just a simple terminal block - the conductor(s) that bring the source to the item in question are the supply side conductors.

All the conductors leaving that item to continue to deliver energy to another item are load side conductors, however in relation to that 'other' item they are supply side conductors.

Line is generally synonymous to supply side.

Something like "supply side bonding jumper" however does have a definition in NEC
 
Pinnie said:
Another question. How does the first ocpd after a transformer protect its supply conductors. Wouldn’t it just protect the conductors downstream of itself?
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It only protects against overloading. Short circuits or ground faults ahead of it will not be detected at all by that device. If things are designed correctly the overcurrent protection on primary side should still respond to short circuits/ground faults on the secondary, but depending on conditions it may not be as fast of response as if a short circuit or ground fault occurred in the primary conductors as you do have impedance of the transformer in the circuit. This big factor in the reason for the tap rules associated with the conductors on the secondary.
 
kwired said:
It only protects against overloading. Short circuits or ground faults ahead of it will not be detected at all by that device. If things are designed correctly the overcurrent protection on primary side should still respond to short circuits/ground faults on the secondary, but depending on conditions it may not be as fast of response as if a short circuit or ground fault occurred in the primary conductors as you do have impedance of the transformer in the circuit. This big factor in the reason for the tap rules associated with the conductors on the secondary.
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What happens in the primary if say there’s a bolted short on the secondary?
 
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