Busbar Ratings - When did they change?

[Chamuit]

I seem to remember that disconnects and panel busbars used to have quite a few different ratings and that they became more uniform.
For example, disconnects under 100A would have either a 30 or 60 amp rating, now they are both rated @ 60A whether designed for a 30 or 60.
Panels had 100, 125, 200, and 225, now only 125 and 225.
Am I imagining things?

 

[infinity]

Where are you seeing this new information?

 

[Coppersmith]

It's probably less expensive to manufacture and get listed fewer parts that can be used in multiple products.

 

[Chamuit]

Where are you seeing this new information?

I am not. Someone asked me about busbar ratings in panels and I could have sworn it was more standardized. I'm thinking I heard this about 20 years ago. I could be misremembering since I'm a few miles down the road of life.

 

[electrofelon]

I think what you say is probably true, but hard to get official documentation from a manufacturer. For some reason they seem to like to keep this a secret.

 

[James L]

I seem to remember that disconnects and panel busbars used to have quite a few different ratings and that they became more uniform.
For example, disconnects under 100A would have either a 30 or 60 amp rating, now they are both rated @ 60A whether designed for a 30 or 60.
Panels had 100, 125, 200, and 225, now only 125 and 225.
Am I imagining things?

It may just be your exposure to various products.

Not sure what type of 30- and 60-amp disconnects you mean, but they're both still available in various forms.

I use 30-amp 3-pole fusible disconnects (safety switch) on residential elevators, also 30-amp single pole disconnects on the same elevators.

I use 30-amp fusible and non-fusible 2-pole pullout disconnects on air conditioners,

As far as 100 vs 125, I've always seen that difference in main breaker panels (100) vs main lug panels (125). Same with 200 (MB) vs MLO (225)....still today you can get them all