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I found some questions from the following sentence.

1. No conduit shall be of less than 20mm diameter. (Why use "of" ?)

No conduit shall be less than 20mm diameter. (Is it correct?)

2. At bolt connections, care must be taken to avoid runs of paint through holes. ( Is runs as a noun?)

3. Some equipments are required to be ordered within this week. (Why use "to be ordered"?)

Some equipments are required to order within this week. (Is it correct?)

4. Referring to liaison with you that i would like to ........ (Is it correct?)

Help me to solve! Thanks
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To me, in sentence #2, "avoid runs of paint", together, means " avoid the paint drops running through holes". Besides, "Some equipments are required to order within this week" would mean as if the equipment itself has an ability to order; Emotion: smile which, of course, you really don't mean!
Comments  
1. I have no idea because I've never met it before.
2. "run" is a noun in your sentence. I think "run" in this situation means the way things usually happen or the way things seem to be happening on a particular occasion.
3. "to be ordered" is passive. Like the way you use "are required". Your sentence can be rewritten: "People (or someone) require to order some equipments within this week."
4. I don't know! Emotion: sad Waiting for another can help you with the sentence 1 and 4. Emotion: wink

Tammy
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hello! i think the word "equipment" does not have a plural form...
 rishonly's reply was promoted to an answer.
Ben9108I found some questions from the following sentence.

1. No conduit shall be of less than 20mm diameter. (Why use "of" ?) Here of means "Of a size" just clarification.

No conduit shall be less than 20mm diameter. (Is it correct?)

2. At bolt connections, care must be taken to avoid runs of paint through holes. ( Is runs as a noun?) Runs refers to paint dripping.

3. Some equipments are required to be ordered within this week. (Why use "to be ordered"?) Means that some equipment needs to be orders this week but has not been ordered as of now.

Some equipments are required to order within this week. (Is it correct?)

4. Referring to liaison with you that i would like to ........ (Is it correct?) Needs a comma after "with you"

Help me to solve! Thanks
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