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CIRCUIT DIAGRAM SYMBOLS

electrical netwcrk ełemerts

three-phase ine or cable

single-phase Ihe or cable

-n_rip-	resistor
_nnnr\_	reactor or transformer,
	motor or generator wvi<fng
1	capaator
T
>-	star-connected wrdng

-n_pfr-

source of arrent

measŁring device

varistor or surge arrester

earth electrode

supply incoming feeder

variable resistor iron core reador

impedance (Z, R, L or C) delta-conneded vwndhg

spark gap or cveivolage limiter

ttyristor

rectifier

svMtcti disconnector

fuse

tircuit-breaker

rantactor

drawout arcuit-breaker

changewer tircui-breaker

li		metering
©		ełedrical power out te t
\	isolator 1
1		swtch-fuse
-S	□	arcuit-breaker fitted \wth a (thermal) overtoad and (magnetic) shcrt-drcul trip retay
	)
J		fuse contactor
		| changewer swtch
	1
		L

m

transformer flted \wth an on-loadtap changer $
		artifidal neutral or earthing transformer
c	)	arrent transformer
©		asynchronous generator

abbreviations

voltage transformer
l	battery
©	A.C. generator or alternator
0	motor

-UPS	: uninterruptible power supply
- PIM	: permanent insulation monitor
- RCD	: residual current device
-IT	: unearthed neutral and earthed exposed conductive part
-N	: neutral
-NC	: normally dosed
-NO	: normally open
-PE	: protectwe condudor
-PBI	: combined protectwe and neutral condudor
-Ph1,Ph2, Ph3	: phase 1,2, and 3
-TN	: earthed neutral and neutral-cormeded exposed conductive part
- TNC	: earthed neutral, neutral-conneded exposed condudive part, combined neutral and protedive condudor
-TNS	: earthed neutral, neutral-conneded exposed condudive part, separate neutral condudor and protedwe condudor
-TT	: earthed neutral and earthed exposed condudive part

: signifiesthatimpedancesZl andZ2 are in paralleL

-Z1//Z2