Electrical Code Information - Trane XL19i-APG02-EN Application Manual

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Table of Contents

Compliance with Local, State, and National Codes is a must on every HVAC Installation. This page

discusses the criteria regarding minimum working spaces as defined in the 2002 National Electric Code.

The main concern is the safety of the HVAC service / maintenance person. Minimum working clearances

are specified in the National Electric Code (NEC) Article 110.26

For electrical equipment that from ground to power the voltage is 600 volts or less:

The National Electric Code specifically states that service area around electrical equipment shall provide

sufficient access, and shall be properly maintained in order to permit safe operation and maintenance of the

equipment. Table 110.26 as well as the figures beside the table describe the minimum clearance for proper

service and access to electrical equipment.

Trane residential and light commercial condensing units ranging from 1 to 6 ton require access to the side

service panel as indicated on the previous pages to gain access to the electrical controls.

The table and figure below are excerpts from the National Electric Code 2002:

Table 110.26(A)(1)

Working Clearances

Nominal

Voltage to

Ground

Condition 1

0-150

900 mm (3 FT)

151-600

900 mm (3FT)

Note: Where the conditions are as follows

Condition 1 - Exposed live parts on one side and no live or grounded parts

on the other side of the working space, or exposed live parts on both sides

effectively guarded by suitable wood or other insulating materials. Insulated

wire or insulated busbars operating at not over 300 volts to ground shall not

be considered live parts

Condition 2 - Exposed live parts on one side and grounded parts on the

other side. Concrete, brick, or tile walls shall be considered as grounded.

Condition 3 - Exposed live parts on both sides of the work space (not

guarded as provided in Condition 1) with the operator between.

Protection Association. This reprinted material is not the complete and official position of the NFPA on the

referenced subject, which is represented only by the standard of it's entirety.

National Electrical Code and NEC are registered trademarks of the National Fire Protection Association, Quincy, MA.