Originally Posted By: pabernathy
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?Accessible, Readily: (Readily accessible.)?: Capable of being reached quickly for operation, renewal, or inspections, without requiring those to whom ready access is requisite to climb over or remove obstacles or to resort to portable ladders, chairs, etc.?
This disconnecting means is permitted to be installed on or within the air-conditioning equipment. An air-conditioner or heat pump compressor is generally located on a concrete pad located at the outside of a one- or two-family dwelling. It may also be located under the house in a crawl space or on the roof. It is important to remember that the definitions of within sight and readily accessible have a significant meaning in this application.
The disconnecting means is usually located next to the air-conditioning unit and is, therefore, considered as being readily accessible since the proper working space should be provided in accordance with NEC Section 110-26.
However, where the disconnecting means is located ?behind or above? the air conditioning unit, accessibility to the disconnect will be hindered and will be in violation of the working space requirements of NEC Section 110-26(a). This type of installation is incorrect and still remains as a very common problem in the field.
The purpose of the required disconnecting means is to provide a ?ready and visible means? of disconnect for the person who will service or repair the equipment. The requirements of NEC Article 430, where a ?locking type? of disconnecting means may be permitted out-of-sight of the motor, are not applicable for this equipment.
Note: A disconnecting means as described above is not required for cord- and plug-connected equipment such as room air conditioners.
Working space about electrical equipment that is likely to ?require examination, adjustment, servicing, or maintenance while energized?N must be provided in accordance with Table 110-26(a). The working clearance must be in the direction of access to the equipment, or the part of the equipment, that is likely to be worked on while there are live exposed parts. It is very common for service persons to examine or test this equipment while it is energized.
Generally, this working space is 30 inches wide and 36 inches deep. Compliance with this working space rule requires that consideration be given to providing safe access at the time the equipment is being installed. Clear working space is required in front of access panels on this equipment.
Paul W. Abernathy- NACHI Certified
Electrical Service Specialists
Licensed Master Electrician
President of NACHI Central Virginia Chapter
Moderator @ Doityourself.com
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