Switchboards

[michael scanlon]

I am researching "code violations" that may or may not exist in an existing switchboard. It is difficult to see from the photos the architect sent over but, I think they are concerned with twine that was used as cable support and cable management. So I guess my question is, What are the proper methods for supporting and manageing cables in a switchboard?

 

[bennie]

Re: Switchboards

At one time twine was all there was to lace and secure multiple wires.

Spools of waxed twine were available for this purpose.

Wire looms, on aircraft, were often hand fabricated with waxed twine. Properly installed this method was good for strain relief and preventing vibration damage.

 

[dereckbc]

Re: Switchboards

My guess is the cord you are seeing is a waxed polyester lacing twine. It is common, and to my knowledge code compliant.

It is used in the telecom industry for its strength, sunlight resistance, and abrasion resistance. It is good stuff, and shows high quality workmanship if laced properly.

[ April 21, 2003, 10:13 AM: Message edited by: dereckbc ]

 

[flightline]

Re: Switchboards

Our custom panel builder, [local], afixes a sticker to the interior can of switchbaords depicting the "lacing" of the free supply conductors feeding the board. I was told that this was to assist in the retardation of movement due to the great magnetic forces that occur during a hevay, more or less bolted, schort citcuit.

If it is branch circuitry, I too have seen waxed cordage used for this purpose. I believe it is still available in communications supply houses. While somewhat arcane, and replaced by cable ties, plastic loom, or other such modern day contrivance, it wouls still work.

 

[michael scanlon]

Re: Switchboards

Is waxed twine also permitted in High Voltage Switchboards? And what about cardboard used as a barrier in a High Voltage swtichboard? I can't imagine that is code compliant.