5.3003.16 Evaluating Electrical Service

Topic: 
Forced Air
Subtopic: 
System Assessment and Maintenance
Desired Outcome: 
Electrical components properly tested
TitleSpecification(s)Objective(s)
5.3003.16a
Service entrance

Homes will have a four-wire service entrance to the panel box to ensure a wiring system that is nominally rated at 120/240 volts and allows for proper grounding

Grounding at the service entrance will be checked to determine proper grounding of the home

Ensure occupant and worker safety

5.3003.16b
Polarity

Polarity of equipment will be verified by a qualified technician if wiring is to be modified or repaired

Ensure equipment:

  • Operates as designed
  • Operates safely
5.3003.16c
Voltage: incoming power

Voltage will be in accordance with manufacturer specifications

Ensure equipment operates as designed

5.3003.16d
Voltage: contactor

Voltage drop will be within acceptable range in accordance with manufacturer specifications

Ensure contactor does not overheat

Ensure equipment operates as designed

5.3003.16e
Grounding

Grounding will be connected in compliance with local code requirements, ANSI ANSI American National Standards Institute, www.ansi.org /NEMA GR 1-2007, and NFPA NFPA National Fire Protection Association, www.nfpa.org 70 National Electric Code

Frames of home sections will be bonded with copper wire

Bonding lug will be selected to prevent corrosion due to dissimilar metals

Ensure equipment:

  • Operates as designed
  • Operates safely

Ensure ground continuity among sections

5.3003.16f
Blower amperage

Amperage will not exceed manufacturer full load amperage

Ensure equipment:

  • Operates as designed
  • Operates efficiently
  • Operates safely
5.3003.16g
Compressor amperage

Amperage will not exceed manufacturer full load amperage

Ensure equipment:

  • Operates as designed
  • Operates efficiently
  • Operates safely
5.3003.16h
Door switch operation

Blower compartment safety switch operation will be verified, if present

Ensure blower:

  • Does not operate during service
  • Cannot backdraft a flue when the door is off
5.3003.16i
Heat pump: emergency heat

Emergency heat circuit functions will be verified

Ensure system delivers heat in case of compressor failure