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#598269 02/23/16 02:37 PM
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Circuit protection

Circuit protection
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That first one is special! lol


Jeff Moss

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Probably didn't have an available standard 66 block at the time. eh


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How cute! Put protective covers over the first two clips. The other four on the same circuit won't tell anyone.


Ed Vaughn, MBSWWYPBX
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Originally Posted by EV607797
How cute! Put protective covers over the first two clips. The other four on the same circuit won't tell anyone.


It's one of those special blocks that have the center pins isolated from the others. I think he's good to go.

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Oh no it isn't. It is a 66B4-25 block, meaning six clips per pair in a full row. If it was a split block, it would have been a 66B3-50 (three clips per pair on each side). Look at the designation at the bottom of the block.

Besides, Western Electric B4 blocks were gray in color. B3 blocks were white. Easy identification. Reliable Electric started coloring theirs the same way at some point for the same reason since picking the incorrect block meant a lot of lost productivity to fix it.

It was still quite possible to install a 66B4-25 block upside-down, resulting in the clips facing in the wrong direction for the outgoing five pairs. Nobody ever came up with a fool-proof way to install them properly, although Reliable did place their label at the top end of the block, indicating that the feed was on the left simply by marking the top end.

They did the same coloring thing with 66M1-50 vs: 66M1-25 blocks. Gray=25 pairs, white=50 pairs. For some reason, the third major player in block manufacture (Siemon Company) kept all of their blocks white, to this day.

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That is correct. They used a B4-25 block.

Back in the day when craftspeople actually took pride in their work, it was a thing of beauty to see the layout of a well designed 1A2 system with the B4 blocks being fed from the left and all the down stream wiring to the right. One didn't need to microscopically inspect every block because the grey were B4-25 and the white were B3-50. Life was good.

Siemon was always on their own schedule. I guess they figured they were "the standard" therefore they didn't need to change!!! If you don't see the sarcasm there, then you missed a good laugh.

Rcaman


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