50/30 amp RV Park standards?
Here's an ignorant question for you. When an RV park advertises 50 amp and 30 amp at the posts, how much total power is available at the post? Is the 30a tied to the 50a, so you still only have 50a ...
Forum Discussion
While I'm quoting the 2002 code, I don't believe it has changed since then.
Table 551.75 Demand Factors for Site Feeders & Service Entrance Conductors for Park Sites:
# of Vehicles / Demand Factor (percent)
1 / 100
2 / 90
3 / 80
4 / 75
5 / 65
6 /60
7- 9 / 55
10 - 12 /50
13 - 15 /48
16 - 18 /47
19 - 21 / 45
22 - 24 /43
25 - 35 / 42
36 + / 41
While there is a FPN (Fine Print Note) that the demand factors may be inadequate in areas of extreme hot or cold temperatures with loaded circuits for heating or air conditioning, it does explain why some parks have considerable voltage drop when filled.
Table 551.75 Demand Factors for Site Feeders & Service Entrance Conductors for Park Sites:
# of Vehicles / Demand Factor (percent)
1 / 100
2 / 90
3 / 80
4 / 75
5 / 65
6 /60
7- 9 / 55
10 - 12 /50
13 - 15 /48
16 - 18 /47
19 - 21 / 45
22 - 24 /43
25 - 35 / 42
36 + / 41
While there is a FPN (Fine Print Note) that the demand factors may be inadequate in areas of extreme hot or cold temperatures with loaded circuits for heating or air conditioning, it does explain why some parks have considerable voltage drop when filled.
