[FONT=Arial]Air Conditioning and Refrigeration[/FONT]
[FONT=Arial]Air conditioning and refrigeration equipment requirements are covered in
Article 440 of the National Electrical Code®. Hermetic motor-compressors are not rated in “full-load amps” as are standard motors. Instead, different terms are used, such as rated load current, branch circuit selection current, maximum continuous current, minimum circuit ampacity, and maximum overcurrent protection. This equipment has overcurrent protection
requirements that differ from that for ordinary motors covered in Article 430. Some highlights are presented here.
Branch Circuit Protection HVAC
Individual Motor-Compressor(s) and HVAC Equipment
Having Motor-Compressor(s) and Other Loads (Such as Fan Motors, Electric Heaters, Coils, etc.). Fuses sized for branch circuit protection only must not exceed 175% of the
hermetic motor-compressor rated-load current or branch circuit selection current (whichever is larger). If this size fuse cannot withstand the motor starting current, a higher amp rating is permitted, but in no case can the fuse size exceed 225% [440.22(A)].
Low-Peak dual-element and Fusetron dual-element fuses are recommended for branch circuit protection of air conditioning and refrigeration hermetic motor compressors because these fuses have an adequate time-delay for motor starting surges.
Refer to the nameplate on the equipment. The sizing (amp rating) for the overcurrent protection has been determined by the manufacturer of the equipment. It is not necessary to apply any further multipliers to arrive at the proper size. This has already been done by the manufacturer.
The marked protective device rating is the maximum protective device rating for which the equipment has been investigated and found acceptable by nationally recognized testing laboratories.
See “Listed or Labeled Equipment” for requirement when nameplate states Maximum Size Fuse. This is a critical requirement, and must be followed without exception to be in compliance with 110.3(B) of the Code. NEC
110.3(B) requires that listed or labeled equipment must be installed in accordance with any instructions included in the listing or labeling.
The most recent change in the NEC requires the following
In dwelling units, at least one receptacle outlet shall be installed in bathrooms within 900 mm (3 ft) of the outside edge of each basin. The receptacle outlet shall be located on a wall or partition that is adjacent to the basin or basin countertop
*[FONT=Arial][size=3]Exception: The receptacle shall not be required to be mounted in the wall or partition where it
**is installed on the side or face of the basin cabinet not more than 300 mm (12 in.) below the *countertop.