Delta MCS-1800 Spécifications télécharger pdf (Page 62)

NEW!

POWER MONITORING & PROTECTION

972

NEW!

POWER MONITORING & PROTECTION

16

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POWER EQUATIONS

A

C

B

120(240)(480)

120(240)(480)

120(240)(480)

Three-phase Three-wire

POLYPHASE (VAC)

SINGLE-PHASE (VAC)

A

C

B

208(416)

240(480)

120(240)

Three-phase Four-wire Delta

120(240)

240(480)

120(277)

120(277)

120(277)

208(480)

208(480)

208(480)

Three-phase Four-wire Wye

C

B

A

N

N

A

120(240)(480)

Two-wire

N

Ground

Line

A

120(240)

Three-wire

N

Ground

Line

120(240)

B

240(480)

Line

= amps x (length of circuit in ft) x 2* x (ohms per 1000 ft)

1000

= I x L x 2* x R

* Change to 1.73 for three-phase

SINGLE-PHASE VOLTAGE DROP

ΔV

Δ

V

Wire Size AWG ohms/1000 ft (@ 77°F)

(Stranded)

24 25.67

22 16.46

20 10.35

18 6.512

16 4.095

14 2.576

12 1.620

March 2014

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