- Location
- Massachusetts
Depends on the zone
but at an actual say 10:1 probably not
even a severe zone will impose a 1 g force laterally
the resultant still << 10:1
attachment to the wall is always preferred
I also use vibration isolators on the clg strut if not braced to wall, otherwise on xfmr base
I also prefer angle > threaded rod and limit length
weight factors in
200 lbs requires a different approach than 1000
F = ma
a is a resultant of g gravity (basically the weight) and external, usually siesmic
m is mass or weight, ie, proportion to the net force
OK. lets try this, forget the rods forget the angle iron.
I have a thousand pound transformer that I will hang with four 1" wire ropes that have a minimum breaking strength of 83,600 lbs and safe working load of 16,700 lbs.
Is that over design sufficient for seismic bracing?
IMO, and I am willing to be shown I am wrong, it is not.
It is my understanding that seismic bracing is not just about keeping things from dropping to the floor but to keep things still relative to the building so that conduits, wires etc are not damaged by the swinging transformer.