To flex or not to flex my transformer?

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VinceS

Senior Member
I have always shifted from GRC to Flex when entering a transformer. Today after running my voice in overdrive, stating "You can't run GRC to a transformer!". I'm at a loss to find this in the code... I know this is a common practice on motors and transformers because they need to be changed and can vibrate, is it code?

I have looked in 110, 300, and 310, also 450. I hope I missed it... Or I just may be wrong.... AHHHH, I hate to be wrong!

If this is legal, is a pull point a requirement?

Please provide this foggy mind a code ref if possible. Thanks for the help...
 
SO,,,

SO,,,

Does anyone else flex there transformers?

Is it a common practice?

Or am one of a small group which continues to flex the final few feet to a transformer?
 
Ive always been taught to flex my tformers. I would have been telling my guys they had to as well. Doesnt it have to do with vibrations ? Is this just another hugh myth and actually not code?
 
billdozier said:
Ive always been taught to flex my tformers. I would have been telling my guys they had to as well. Doesnt it have to do with vibrations ? Is this just another hugh myth and actually not code?
Click to expand...

The NEC does not require flex, many job specifications do require flex.:smile:

My personal opinion is that flex is a darn good idea if the transformer is in a quiet area. Hard piping it is more likely to transmit noise.
 
I'm going to "flex" one tommorrow.Was it ever decided that
a EMT to ridgid coupling to flex connector was compliant?
You know "Intended Use",Listed for the purpose,approved method,etc?
I use a EMT to Flex connector unless the pipe is too large then I
use a J-box or gutter.
 
Flex

Flex

There doesn't always need to be a code when common or should I call it rare sense is concerned. I call it rare sense because it's so uncommon to have common sense.There is a code that covers all basic installations.Remember Workman like manner. article 110 ring any bells. Come on, do we all really need a step by step code book for every move we make. Remember electrical is 80% mechanical.
 
ange said:
There doesn't always need to be a code when common or should I call it rare sense is concerned. I call it rare sense because it's so uncommon to have common sense.There is a code that covers all basic installations.Remember Workman like manner. article 110 ring any bells. Come on, do we all really need a step by step code book for every move we make. Remember electrical is 80% mechanical.
Click to expand...

Welcome to the Forum
 
Karl H said:
Was it ever decided that
a EMT to ridgid coupling to flex connector was compliant?
You know "Intended Use",Listed for the purpose,approved method,etc?
Click to expand...

I don't think there is any official seal of approval to that method. However, common sense and trade practice prove otherwise.
 
Hi Chris Kennedy,

I haven't been here in a couple of years or more so maybe it's starting fresh, and yes, I am a slow 2 finger typer. Isn't everyone?
 
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