The only two applications I have encountered where rigid conduit was run directly to a motor have been;
1> Gasoline dispensing pumps where everything must be explosion proof and even there we often used explosion proof flexible sections. With the advent of premade mineral insulated gas pump connection whips, no one can aford the labour cost of fitting rigid conduit.
2> The other was an interesting individual. He called for a machine to be connected by rigid stainless steel conduit rising vertically through the ceiling without bend or offset.
No description of the machine, no size, no conduit or cable size, no location drawing to locate the conduit entry and the pressure was on the electricians to pre-install the conduit.
The designer showed up and introduced himself by denigrating the local work force,
"We build these plants all over the place with no trouble, what seems to be the problem here."
The electrical foreman showed him the print in question and asked for some further information.
"Wait, now I remember. You know, I remember when I was drawing this, wondering just what the hell that was!"
Then he left the site.
My boss knew my short tolerance for idiots and moved my to another project the next day.
But, back to the issue at hand. There may be something in the mechanical codes that says something like;
"The resilience of the resilient mounts shall not be compromised by bridging them with rigid members such as conduit."
Bill
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"Why not the best?"
Jimmy Carter
