National Electrical Code Top Ten Tips:
Article 551, Recreational Vehicles and Recreational Vehicle Parks. Part 1.
- Article 551 amends the Chapter wiring methods; it does not replace
them. Where Article 551 is silent, Chapter 3 requirements apply.
[551.47(A)].
- You can't mix metallic and nonmetallic wiring methods. That is,
use nonmetallic raceway (or non-metallic sheathed cable) if you use
nonmetallic boxes. [551.47(C)].
- In these wiring systems, no bend can have a radius of less than
five wire diameters [551.47(H)].
- Any prewiring must meet the applicable part of 551.47(Q), (R),
or (S).
- Any luminaire installed over a bathtub or in a shower stall must
be GFCI-protected [551.53(B)].
- Do not ground interior electrical equipment. Where 551.55 speaks
of "grounding," it means "bonding." If you review these terms in
Article 100, you will see the terminology error when you read the
requirements. Make sure you bond, not ground, interior equipment.
- Bonding conductors for non-current carrying metal parts must be
at least #8AWG [551.56(C)].
- You will find the requirements for RV Parks in Article 551, Part
VI. Calculate loads per 551.73.
- You'll find another terminology error in 551.75. It should say,
"...shall be grounded and bonded..." but omits the bonded part.
- This grounding/bonding error is repeated in 55.76. You will have
to refer back to the Article 100 definitions to make sense of these
requirements. You must comply with the intent of the NEC here, not
with what it says. If you ground where you should bond, someone can
be electrocuted due to that error.
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