Working space in front of DC Control panels 110.26(A)(1)

[Dale001289]

Does table 110.26(A)(1) apply to 24VDC panels with 4-20mA and Discreet signals only?

 

[don_resqcapt19]

Does table 110.26(A)(1) apply to 24VDC panels with 4-20mA and Discreet signals only?

It probably shouldn't but Table 110.26(A)(1) starts at "0" volts. There are PIs for the 2020 code that would make that table start at 50 volts if they would be accepted by the CMP.

 

[petersonra]

It probably shouldn't but Table 110.26(A)(1) starts at "0" volts. There are PIs for the 2020 code that would make that table start at 50 volts if they would be accepted by the CMP.

why not just put some teeth into 110.26(A)(1)(b) by taking out "By special permission," and adding a new table that defines how much smaller you are allowed to go.

changing the table would just mean that while working space would still be required under 50V, it would not be specified.

 

[don_resqcapt19]

why not just put some teeth into 110.26(A)(1)(b) by taking out "By special permission," and adding a new table that defines how much smaller you are allowed to go.

changing the table would just mean that while working space would still be required under 50V, it would not be specified.

Given that the NEC is safety related, do we need any clearance for that type of equipment beyond what is needed to physically install it?

 

[petersonra]

Given that the NEC is safety related, do we need any clearance for that type of equipment beyond what is needed to physically install it?

If it is just about safety, why do you need any clearance at all?

And anyway, how does the working space have anything to do with safety? You can work just as safely in a box with 29 inches of clearance in front of it as 31.

 

[don_resqcapt19]

If it is just about safety, why do you need any clearance at all?

And anyway, how does the working space have anything to do with safety? You can work just as safely in a box with 29 inches of clearance in front of it as 31.

Space to be away from contact with anything that may be a hazard while your are working on the equipment. Space to let you jump back when you let the magic smoke out

As far as the actual distance, I assume it is like a lot of numbers in the NEC....just an arbitrary number because they have to draw a line somewhere.

Why is the 10' tap rule not a 12' tap rule, would there really be any difference in the safety of the system?

For low risk equipment like this, I think just the parent text in 110.26 should apply, but that is not the case with the rules as they currently exist.

 

[petersonra]

Space to be away from contact with anything that may be a hazard while your are working on the equipment. Space to let you jump back when you let the magic smoke out

As far as the actual distance, I assume it is like a lot of numbers in the NEC....just an arbitrary number because they have to draw a line somewhere.

Why is the 10' tap rule not a 12' tap rule, would there really be any difference in the safety of the system?

For low risk equipment like this, I think just the parent text in 110.26 should apply, but that is not the case with the rules as they currently exist.

if all the energized components are inside the box and you have your gloves just what risk is there?

as for jumping back, is that a recognized safety maneuver?

 

[don_resqcapt19]

if all the energized components are inside the box and you have your gloves just what risk is there?

In this case there is no real risk, but with higher voltages there is a risk even where you have PPE.

as for jumping back, is that a recognized safety maneuver?

No, but everyone does it as a reaction.

 

[Aleman]

No, but everyone does it as a reaction.

Yep it's kind of tough to not jump when you get hit. It's a very natural reaction to an unnatural situation