Load calc

[jasonprice]

In a residential load calculation, do I have to count a dock pedestal? No where in art. 220 does it state that or what load is to be counted and if you can derate for that load.

 

[ron]

220.14 Other loads

No derate for that load

 

[jasonprice]

220.14 Other loads

No derate for that load

I understand that 220.14 (A) states "An outlet for a specific appliance or other load not covered in 220.14(B) through (L) shall be calculated based on the ampere rating of the appliance or load served." If the pedestal is installed with a 30 amp, 50 amp, and a GFI what is my "load served"? Boats change on a dock all the time and are not set in place connected equipment, not to mention the load requirements vary depending on equipment in a vessel. So what would be the VA I would use in place for my calculation (I'm using the optional method)?

 

[infinity]

I understand that 220.14 (A) states "An outlet for a specific appliance or other load not covered in 220.14(B) through (L) shall be calculated based on the ampere rating of the appliance or load served." If the pedestal is installed with a 30 amp, 50 amp, and a GFI what is my "load served"? Boats change on a dock all the time and are not set in place connected equipment, not to mention the load requirements vary depending on equipment in a vessel. So what would be the VA I would use in place for my calculation (I'm using the optional method)?

What size circuit is feeding the pedestal?

 

[jumper]

Aren’t private/residential docks and marinas covered under article 555 in the 2017 NEC?

If so, would not section 555.12 with its table and footnotes apply here?

 

[jasonprice]

What size circuit is feeding the pedestal?

125 amp

 

[kwired]

Aren’t private/residential docks and marinas covered under article 555 in the 2017 NEC?

If so, would not section 555.12 with its table and footnotes apply here?

Didn't look but yes, any method in 555 of calculating loads for such applications is likely what should be used.

Also he said pedestal has 30, 50 and 20 amp receptacle - probably about same thing as an RV pedestal I'm guessing. I would think if arranged that it would only be intended to supply one boat at a time, you wouldn't need to figure any more than what would be necessary for just the single 50 amp receptacle.

 

[infinity]

Sounds like a private boat dock for a single family dwelling does not fall under Article 555.

555.1 Scope.
Private, noncommercial docking facilities constructed
or occupied for the use of the owner or residents of the
associated single-family dwelling are not covered by this
article.

 

[Strathead]

125 amp

wow, why such a large circuit? I agree that you would likely only be using a single receptacle possibly the largest one, and without a known load I would just make one up, say 45 amps time 240 volts. Or even just use 50 amps and be done with it, but 125 amps? I would have to clarify that usage.

 

[infinity]

I understand that 220.14 (A) states "An outlet for a specific appliance or other load not covered in 220.14(B) through (L) shall be calculated based on the ampere rating of the appliance or load served." If the pedestal is installed with a 30 amp, 50 amp, and a GFI what is my "load served"? Boats change on a dock all the time and are not set in place connected equipment, not to mention the load requirements vary depending on equipment in a vessel. So what would be the VA I would use in place for my calculation (I'm using the optional method)?

So the question is what is the load served? Could it be argued that the OCPD ahead of the circuit needs to be used in the calculation?

 

[kwired]

wow, why such a large circuit? I agree that you would likely only be using a single receptacle possibly the largest one, and without a known load I would just make one up, say 45 amps time 240 volts. Or even just use 50 amps and be done with it, but 125 amps? I would have to clarify that usage.

Well if he only has a 50 amp 125/250 recep, a 30 120 recep, and a 20 120 recep, and puts the two 120 volt receps on opposite sides of the neutral, the most he can draw without exceeding branch circuit ratings is 80 amps, so I would say that is absolutely the most you should have to figure for it.