Wiska boxes with wagos

mapj1: 
 

The question is ‘is it bad practice to let connector blocks (of any kind)  flap about on the wire ends in a box.?’

Interesting question. I wouldn't be happy at a screw terminal having to support too much weight (with the exception of a GLS fitting for which the rose and lampholder are specifically designed for the purpose) 

So, for example, I might not always worry about a terminal block being fixed within an accessory where the cables are partly supported by either grommets, glands or plaster, but I wouldn't like to put one in a vertical run, say in trunking or a round conduit box without strain relief of some sort.

The same things, especially when considering singles in conduit/trunking installations, probably ring true for screwless terminals, though …

In summary:

•  if there's no strain-relief on the cable or wire, and it might be subject to [axial] strain on the connection, you're asking for trouble regardless of whether the terminal (of any kind) is fixed itself or not
• fixing of the terminal itself is dependent on vibration environment, and is quite possibly useless in that environment without strain relief on the wiring also.

Maybe, if this is a place with a lot of vibration or sudden acceleration, where the flapping about matters because a wire may get fatigue failure or shake out. If however it is not a fun-fair ride or something, then the other big question is do the cables get pulled?. We'd hope that any flexes would come via a compression gland that held it tight, and any rigid wiring was held by clips or cleats. 

Apart from the spaghetti problem of  lots of tail end not fitting in the box, and perhaps poor airflow if the box is too full, I see no real issues, after all a similar approach seems to work for telecoms. 

It is however a bit ugly.

Mike.

Generally agree but see above.

mapj1: 
 

The question is ‘is it bad practice to let connector blocks (of any kind)  flap about on the wire ends in a box.?’

Interesting question. I wouldn't be happy at a screw terminal having to support too much weight (with the exception of a GLS fitting for which the rose and lampholder are specifically designed for the purpose) 

So, for example, I might not always worry about a terminal block being fixed within an accessory where the cables are partly supported by either grommets, glands or plaster, but I wouldn't like to put one in a vertical run, say in trunking or a round conduit box without strain relief of some sort.

The same things, especially when considering singles in conduit/trunking installations, probably ring true for screwless terminals, though …

In summary:

•  if there's no strain-relief on the cable or wire, and it might be subject to [axial] strain on the connection, you're asking for trouble regardless of whether the terminal (of any kind) is fixed itself or not
• fixing of the terminal itself is dependent on vibration environment, and is quite possibly useless in that environment without strain relief on the wiring also.

Maybe, if this is a place with a lot of vibration or sudden acceleration, where the flapping about matters because a wire may get fatigue failure or shake out. If however it is not a fun-fair ride or something, then the other big question is do the cables get pulled?. We'd hope that any flexes would come via a compression gland that held it tight, and any rigid wiring was held by clips or cleats. 

Apart from the spaghetti problem of  lots of tail end not fitting in the box, and perhaps poor airflow if the box is too full, I see no real issues, after all a similar approach seems to work for telecoms. 

It is however a bit ugly.

Mike.

Generally agree but see above.