CALCULATIONS HELL
SERVICES & FEEDERS
OVERCURRENT
SPECIAL OCCUPANCIES
GROUNDING & BONDING
100

A dwelling has 3000VA general lighting load. The demand factor applied to the first 3000VA is this percentage.

What is 100%? (220.42)

100

Service conductors supplying continuous loads must be sized at this percentage.

What is 125%? (230.42(A))

100

This article governs overcurrent protection.

What is Article 240?

100

Ignitable fibers classification.

What is Class III? (500.5)

100

System that connects electrodes together.

What is Grounding Electrode System? (250.50)

200

A feeder supplies 80A continuous load. Minimum conductor ampacity required is this value.

What is 100A? (215.2(A)(1))

200

Maximum number of service disconnects permitted.

what is 6? (230.71)

200

Standard breaker sizes are listed here.

What is 240.6?

200

Healthcare systems article.

What is Article 517?

200

Conductor that bonds equipment.

What is Equipment Grounding Conductor? (250.118)

300

A 12kW household range demand load is calculated using this table.

What is Table 220.55?

300

Service disconnect must be readily accessible per this section.

What is 230.70(A)(1)?

300

Overcurrent device definition is found here

What is Article 100?

300

Temporary wiring rules.

What is Article 590?

300

Bonding of metal water piping.

What is 250.104(A)?

400

A motor FLC is 28A. Branch-circuit conductors must be sized at this percentage.

What is 125%? (430.22)

400

Feeder tap rules are found here.

What is 240.21?

400

Flexible cords protection rules.

What is Article 400?

400

Hazardous locations article.

What is Article 500?

400

Main bonding jumper rules.

What is 250.28?

500

A 240V circuit supplies a 5760W load. The current is this value.

What is 24A? (Ohm’s Law / 220)

500

Neutral load calculations are found here.

What is 220.61?

500

location of Interrupting rating requirements.

What is 110.9?

500

Marinas and boatyards

555

500

Grounding electrode conductor sizing.

What is 250.66?