hard and soft conversions

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lauraj

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Article 90.9(C)(4), 2005 NEC, states that soft conversions shall be used where a hard conversion would have a negative impact on safety. I would guess that this would be the case with instances such as working clearances. However, I notice in 110.26, all of the clearances given are shown as hard conversions. If soft conversions are not required for working clearances, can someone tell me, where in the code book is it used in this case?
 
Re: hard and soft conversions

An example of a soft conversion is Table 408.56. The working space requirements are hard conversions. It is hard for me to imagine that 14mm as it relates to the depth of the required working space is going to negatively impact safety.

[ January 10, 2006, 07:14 PM: Message edited by: ARBY ]
 
Re: hard and soft conversions

As I understand it hard conversions are approximate conversions from inch-pound units to SI units. Soft conversions are direct mathematical conversions.

It seems backwards to me.

[ January 10, 2006, 07:18 PM: Message edited by: ARBY ]
 
Re: hard and soft conversions

If less is better (i.e. support spacing) then use soft conversions. If more is better use hard conversions.

For example: ... spacing shall be every 1 meter would soft convert to "one every 36 inches", but 1 meter of working clearance would hard convert to 39 inches.
 
Re: hard and soft conversions

I have two years of trade school. Two years of college. A four year apprentiship with school. 16 hours continuing ed.(So far) Almost 15 years in the trade. A journeymans licence, and a master licence.

Then I came to this site and found out how little I know about the code.

Now I have to figure out if to use the metric numbers or the regular numbers :confused: :confused: :confused: :confused: :confused:
 
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